Jolony Technologies is an engineering company built around one job: keeping standby generators ready to carry your operation the moment mains power fails. Assessment, maintenance, diagnostics, repairs and emergency response — delivered by qualified technicians and documented in writing after every visit.
Jolony Technologies is a generator engineering company. We assess, maintain, test, repair and commission standby generator systems — and we support the changeover equipment that decides whether the power actually reaches your building.
Our work is planned around your operation, carried out by qualified technicians, and documented in writing after every visit. The goal is simple: your generator starts, carries the load and transfers back when the mains fails.
Most standby failures are not sudden. They are the result of a weak battery nobody tested, a cooling system nobody cleaned, a transfer switch nobody exercised, or a load nobody ever proved. Jolony Technologies exists to find those faults before the mains supply does it for you.
Hospitals, hotels, factories and telecom sites lose revenue, data and trust the minute power drops. A generator that won't start turns a short outage into a long one.
Without structured inspection and load testing, degradation goes unseen. We measure, record and report condition — so decisions are based on evidence, not guesswork.
Every Jolony visit closes with a professional written report: what was found, what was done, what needs attention next. Facility and maintenance managers get a record they can act on.
From a first condition assessment through to emergency response, Jolony Technologies covers the full lifecycle of your standby power system.
A structured condition survey of the engine, alternator, cooling, fuel, battery and control systems. You get a clear picture of current condition and the risks that need attention.
Learn MoreScheduled servicing to manufacturer intervals — oil and filters, coolant and belts, battery testing and cleaning. Planned work that keeps unplanned failures off your calendar.
Learn MoreSystematic fault-finding on starting, running, voltage, frequency and shutdown faults, followed by competent repair. We find the cause, not just the symptom, and confirm the fix under load.
Learn MoreWhen a generator goes down, response speed decides the size of the loss. Our 24/7 line mobilises a technician to site to restore standby capability as quickly as possible.
Learn MoreProving the set carries its rated load, holds voltage and frequency, and cools correctly under sustained demand. Ideal before handover, after repairs, or as annual assurance.
Learn MoreTechnical support through installation, setting to work, protection checks and handover testing — so the generator and its changeover equipment behave as one system from day one.
Learn MoreAutomatic mains failure panels and transfer switches are where standby systems quietly fail. We test, set and repair changeover equipment so the load transfers when it matters.
Learn MoreMajor mechanical and electrical refurbishment of ageing or heavily worn generator sets, including engine, alternator and associated component work.
Learn MoreInspection, cleaning and maintenance of generator fuel systems, including tanks, fuel lines, filters, contamination and fuel-delivery problems.
Learn MoreStandby power matters most where an outage carries real consequence. These are the sites our technicians work on.
Offices, retail and mixed-use blocks where a mains failure stops lifts, lighting and IT within seconds.
Factories and processing plants where an outage halts production lines, damages work in progress and costs output.
Guest comfort, kitchens, lifts and access control all depend on standby power holding through the night.
Theatre, ICU, cold chain and life-support equipment leave no room for a generator that will not start.
Campus lighting, security, labs and boarding facilities need power that stays on through the school day.
Shared boreholes, pumps, street lighting and security systems serving dozens of households at once.
Base stations, server rooms and control centres where even a brief loss of power breaks the service.
Any organisation running a standby set that needs planned maintenance, testing and a written record.
Jolony Technologies was founded by engineers who spent years on site watching standby power fail for avoidable reasons. We built the business around method: assess properly, maintain on schedule, test under real load, and put the findings in writing.
Our technicians work on commercial and industrial generator systems every week — from small standby sets on office blocks and residential estates to larger installations serving factories, hotels, hospitals, schools and telecom facilities. We understand that for our clients, a generator is not equipment. It is continuity.
That is why we treat every call-out as an engineering task with a documented outcome, and why clients keep us on planned maintenance rather than calling only when something breaks.
Technical competence you can verify, response you can rely on, and a written record after every job.
Breakdowns are treated as emergencies. We prioritise sites where power loss carries the greatest consequence and keep you informed from the first call to the moment standby capability is restored.
Our teams work to recognised electrical and mechanical safety practice, use calibrated test equipment, and follow method statements on every site — including yours.
Findings, readings, work completed and recommended next actions — documented and handed to you. Your maintenance history stays complete and auditable.
Our success is measured by how rarely you need us in an emergency. Planned maintenance, honest condition reporting and load verification are how we keep your standby system ready.
Generator rooms, control panels, load tests and the people who keep them running.
Facility, operations and technical managers on working with Jolony Technologies.
Our standby set had been serviced for years but never properly load tested. Jolony ran the test, found a cooling problem we didn't know about, and fixed it before it became an outage. The report went straight into our compliance file.
We lost mains power during a full-house weekend. The generator picked up without a flicker. That is entirely down to the maintenance programme Jolony put in place and the changeover checks they insisted on.
They responded the same evening we logged the fault and had the set running again before morning rounds. Clear communication, competent technicians, and a written account of exactly what was replaced.
Tell us what your standby system is doing — or not doing — and we'll arrange an assessment, a maintenance visit or an emergency response. For breakdowns, call us directly.
Share your site, generator details and the issue you're seeing. We'll come back to you with the next step.
Everything Jolony Technologies does to keep a standby generator ready to carry load: assessment, planned maintenance, diagnostics, repairs, load verification, installation support and 24/7 breakdown response — including AMF and ATS changeover work.
What the work involves, what we check, and what you receive at the end of it.
A structured condition survey of the whole standby system, carried out before any maintenance programme is proposed. It establishes what you actually have, what condition it is in, and which faults carry the greatest risk.
You receive: a written condition report with measured readings, a risk-rated list of defects, and a prioritised recommendation of what to repair, replace or monitor.
Scheduled servicing to manufacturer intervals, planned around your operation so the generator is never out of service when you need it. This is the work that keeps unplanned failures off your calendar.
You receive: a service sheet listing every task completed, parts and consumables used, running-hour readings, and the date the next service falls due.
Systematic fault-finding on sets that will not start, will not stay running, or run outside specification. We work to the cause rather than the symptom, then confirm the repair under real load.
You receive: a fault report stating the cause found, the repair carried out, parts fitted, and the test results that confirm the set is serviceable.
When a generator goes down, response speed decides the size of the loss. Our breakdown line is answered around the clock, and a technician is mobilised to site with the tools and common spares needed to restore standby capability.
You receive: a breakdown report covering the cause, the work done, parts used, and any follow-up recommended to prevent a repeat.
A generator that starts is not the same as a generator that carries load. Load testing proves the set can hold its rated output, keep voltage and frequency within tolerance, and cool correctly under sustained demand.
You receive: a test record with the load steps applied and the readings taken, suitable for compliance files and insurance requirements.
Technical support through installation, setting to work and handover — so the generator, its changeover equipment and its protection all behave as one system from day one.
You receive: a commissioning record with test results, protection settings as left, and a handover note for your site file.
Automatic mains failure (AMF) panels and automatic transfer switches (ATS) are where most standby systems quietly fail. The generator may be perfectly healthy, but if the changeover does not sense the outage, start the set and transfer the load, the building still goes dark. We support the changeover side of the system as thoroughly as the generator itself.
You receive: a changeover test record with the timings measured, settings as left, and any defect risk-rated with a recommended action.
Automatic mains failure (AMF) panels and automatic transfer switches (ATS) are where most standby systems quietly fail. The generator may be perfectly healthy, but if the changeover does not sense the outage, start the set and transfer the load, your building still goes dark.
Jolony Technologies supports the changeover side of the system as thoroughly as the generator itself — from routine exercising through to fault-finding on panels that transfer late, transfer twice, or fail to transfer back.
We also carry out live mains-failure simulations, so the changeover is proven under real conditions rather than assumed to work.
Every call-out follows the same method, whether it is a planned service or an emergency.
We confirm the site, the set, the fault history and any access or safety requirements, then agree a time window that suits your operation.
Method statement and risk assessment followed, permits obtained where required, and the set isolated and proved dead before any intrusive work begins.
The system is examined against a fixed checklist and readings are taken — not impressions. Anything outside specification is recorded as it is found.
Servicing, adjustment or repair completed on site where possible, using parts matched to your set. Anything needing a return visit is quoted before it is booked.
The set is started, run under load and shut down, and the AMF / ATS changeover is exercised so the whole sequence is proven, not just the engine.
Findings, readings, work completed and recommended next actions are documented and handed over before we leave, with the site team briefed on anything urgent.
Not sure which service your site needs? Send us the generator details and the symptoms, and we will tell you what the next step should be.
Request Generator ServiceOur technicians work on commercial and industrial standby systems every week, from small sets on office blocks and residential estates to larger installations serving factories, hotels, hospitals, schools and telecom facilities.
For these sites a generator is not equipment — it is continuity. That is why we treat every visit as an engineering task with a documented outcome.
Tell us what your standby system is doing — or not doing — and we'll arrange an assessment, a maintenance visit or an emergency response. For breakdowns, call us directly.
Share your site, generator details and the issue you're seeing. We'll come back to you with the next step.
Jolony Technologies exists for one reason: to make sure the generator on your site starts, carries the load and transfers back without drama. We are a generator and standby-power engineering company serving commercial, industrial and technical sites — and we document every job we do.
The company grew out of a simple observation made on site, over and over again: generators were being installed, signed off and then largely forgotten until the day the mains failed. When that day came, the set would not start, the changeover would not transfer, and nobody had a record of when it was last serviced or what had been checked.
Jolony Technologies was formed to close that gap. We began with generator health assessments for commercial buildings and industrial sites — structured condition surveys that told an owner exactly what they had and what condition it was in. That assessment work became the foundation of everything else: planned maintenance, diagnostics and repairs, load testing, installation and commissioning support, and a 24/7 breakdown line for the nights and weekends when standby power matters most.
Today we work across commercial buildings, offices, factories, hotels, hospitals, schools, residential estates and telecom facilities. Our technicians are on standby systems every week, and the same method is applied whether the call is a scheduled service or an emergency at two in the morning.
We would rather tell you a generator is healthy and needs nothing than sell work it does not need.
Standby power is a discipline that spans mechanical, electrical and control engineering. Our team is built to cover all three.
Time-served technicians who work on diesel generating sets daily — engine, fuel system, cooling, exhaust and starting systems. They carry out servicing to manufacturer intervals, diagnose running faults, and complete mechanical repairs on site wherever the work allows.
Qualified electrical engineers who handle the alternator, the protection and the changeover side of the system — the parts that decide whether a healthy generator actually delivers power to your building.
Every job is planned, logged and documented by a coordinator who keeps the site history, the parts record and the service schedule in one place — so nothing depends on a technician's memory.
Whatever we are called out for, the same six-part record is produced. It is what turns a visit into something you can audit, insure and plan against.
The generator make, model, rating, serial number and location, plus the changeover arrangement it is connected to. This is what makes the record traceable years later.
The state of the set before any work began — running hours, visible defects, leaks, corrosion, alarm history and anything the site team reported.
Actual numbers, not descriptions: battery and cranking voltages, oil and coolant condition, insulation resistance, and voltage, frequency, current and temperature under load.
Every task carried out, listed against the service schedule, with the parts and consumables used and their quantities recorded.
The start, load, run and shutdown sequence proven, and the AMF / ATS changeover exercised, with the outcome of each test written down.
Defects risk-rated, with a clear recommendation of what to repair, replace or monitor, and the date the next service falls due.
Ask for a sample report and we will send you one from a comparable site, so you can see exactly what you would receive after a visit.
Request a sample reportOur technicians work on commercial and industrial standby systems every week, from small sets on office blocks and residential estates to larger installations serving factories, hotels, hospitals, schools and telecom facilities.
For these sites a generator is not equipment — it is continuity. That is why we treat every visit as an engineering task with a documented outcome, and why the same reporting standard applies to a routine service and to a breakdown call at midnight.
Whether you need an assessment, a maintenance programme, a second opinion on a fault, or an emergency response, tell us about your site and we will tell you what the next step should be.
Share your site, generator details and what you need. We'll come back to you with the next step.
Email the generator make, model, rating and the symptoms you are seeing, and we will come back with a recommendation — assessment, planned maintenance, repair or a breakdown visit.
Email the teamField notes, engineering guidance and practical detail from the technicians who keep standby generators ready to carry load — planned maintenance, diagnostics, load testing, AMF/ATS changeover work and emergency response.
A set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. This is how planned maintenance, load testing, AMF/ATS changeover work and a genuine emergency response fit together into one standby system you can rely on.
Read the full articleShowing 6 of 10 articles
Cranking voltage, charge alternator output, terminal condition and charger behaviour — the starting circuit checks that explain most no-start calls before a spanner is lifted.
Read article
A perfect set with a failed transfer is still a blackout. How AMF panels and ATS equipment fail quietly, and the checks that catch it before the mains does.
Read article
Radiator cores, coolant strength, fan drives and thermostats can all pass a short run and still fail a sustained one. Why cooling must be proven under real demand.
Read article
Water, sediment, microbial growth and ageing fuel quietly degrade a standby tank. What to test, how often to drain, and why filters are the last line of defence.
Read articleWhen a set turns over but will not run, the fault is in fuel, air, compression or control. A systematic order of checks that finds the cause instead of guessing at parts.
Read article
A service record is evidence. Measured readings, load test results, parts used and the next due date — the six-part document that stands up when a claim is made.
Read articleA transfer switch that has not moved in a year is an unknown quantity. What a monthly simulation proves, what it costs, and how to record the result properly.
Read articleHospitals, hotels, factories and technical sites carry different consequences for the same outage. How criticality should change testing frequency, spares and response.
Read articleRunning hours, condition, parts availability and the cost of downtime all point in different directions. A practical framework for the decision owners put off longest.
Read article
Over-crank, low oil pressure, high coolant temperature, overspeed and emergency stop — each trip is a message from the set. How to read it, and why resetting it is not a repair.
Read articleNo articles match your search. Try a different term, or clear the filters to see everything.
A set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. This is how planned maintenance, load testing, AMF/ATS changeover work and a genuine emergency response fit together into one standby system you can rely on.
Starting is the easiest thing a standby generator has to do. It is also the only thing most sites ever test. A set that fires within ten seconds, settles to a steady idle and shuts down cleanly on the button will pass a weekly start test for years — and still fail the moment the mains drops and the building is handed to it.
That gap between starting and working is where most standby-power failures live. This article sets out what has to be proven, in what order, and why a start test on its own is not evidence of anything.
A successful start tells you the battery held up, the starter engaged, fuel reached the injectors and the engine reached firing speed. That is a real result, but it covers a small part of the system. It says nothing about whether the alternator can hold voltage under load, whether the cooling system can reject heat for an hour, or whether the changeover will transfer at all.
Worse, a no-load start is the gentlest duty the set will ever see. There is no heat to reject, no fuel demand to speak of, and no electrical load to disturb the governor. A set can idle perfectly for twenty minutes with a blocked radiator core, a failing voltage regulator or a transfer switch that has seized.
Load testing applies real demand in controlled steps and records what the set does at each one. Voltage, frequency, current, power factor and temperature are read at every step, and the governor and voltage regulator are watched for how quickly they recover when load changes.
This is where genuine faults surface: a set that sags below tolerance when a large motor starts, a frequency that hunts as load rises, a temperature that climbs steadily instead of levelling off. None of these appear on a no-load run, and all of them matter on the night the mains fails.
Cooling faults are patient. A radiator core that is half blocked, a fan drive that slips under heat, a thermostat that opens late or a coolant mix that has drifted will all pass a short run and fail a sustained one. The only way to find them is to run the set under load long enough for temperature to stabilise — and then to watch whether it holds.
We treat a cooling test as a minimum-duration exercise, not a formality. If the set cannot hold temperature at rated load for the period the site would actually need it, that is a finding, and it belongs in the report.
Everything above concerns the generator. The building is powered by the changeover. An AMF panel or automatic transfer switch has to sense the outage, signal the set to start, wait for the voltage and frequency to be acceptable, transfer the load, and later transfer back with a cool-down run.
Each of those steps can fail independently. Mains sensing can be set on the wrong phase. The start signal can be lost in a control circuit. Transfer timing can be too short, so the load is applied before the set is stable. The switch itself can be mechanically stiff from a year of not moving.
A monthly mains-failure simulation exercises the whole sequence with the site present, and it is the only test that proves the system rather than the machine.
“A generator that starts is a machine that works. A generator that carries the building is a system that works. Only one of those keeps the lights on.”
Jolony Technologies — generator service team
Planned maintenance is not a list of parts to change. It is the schedule that keeps the starting circuit, the fuel system, the cooling system, the alternator, the protection and the changeover all inside specification at the same time. A set is only as ready as its weakest subsystem.
That is why our service visits end with a start, a run under load and a changeover test, in that order, with the results written down. The set is not signed off because it started. It is signed off because the whole sequence was proven.
If your generator has never been run under load, or if the last changeover simulation was more than a month ago, the system is unproven — regardless of how reliably it starts. A standby-readiness assessment records the readings, exercises the changeover and tells you what stands between your site and a blackout.
Jolony Technologies carries out load testing, changeover simulation and planned maintenance across commercial, industrial and technical sites. Call the 24/7 line if your set has already failed to carry load.
More field notes from the technicians who keep standby generators ready to carry load.
Cranking voltage, charge alternator output, terminal condition and charger behaviour — the starting circuit checks that explain most no-start calls before a spanner is lifted.
Read articleA perfect set with a failed transfer is still a blackout. How AMF panels and ATS equipment fail quietly, and the checks that catch it before the mains does.
Read articleRadiator cores, coolant strength, fan drives and thermostats can all pass a short run and still fail a sustained one. Why cooling must be proven under real demand.
Read articleA perfect set with a failed transfer is still a blackout. How AMF panels and ATS equipment fail quietly, and the checks that catch it before the mains does.
When a site loses power during an outage, the generator is usually blamed first. In our experience the set is often in perfect order. It started, it ran, it produced voltage. The building stayed dark because the changeover never transferred the load — or transferred it late, or transferred it twice.
Automatic mains failure (AMF) panels and automatic transfer switches (ATS) are the least exercised equipment on most sites. The generator gets a weekly start. The switch sits still for months at a time, and a mechanism that does not move is a mechanism nobody can vouch for.
The sequence looks simple and is unforgiving. The panel has to detect loss of mains on all phases, signal the generator controller to start, wait until voltage and frequency are within tolerance, transfer the load, and later transfer back with a return-to-mains delay and a cool-down run.
Every step is a place where the sequence can break. Detection can be set on the wrong phase or fail to see a single-phase loss. The start signal can be lost in a control circuit or a blown fuse. Transfer timing can be too short, so the load lands on a set that has not stabilised. The switch itself can be mechanically stiff, or an interlock can be misaligned.
Mains sensing faults are common, particularly where a panel was set up for one supply arrangement and the site has since changed. A panel that only monitors one phase will not see a lost phase, and the site will run on two phases until something expensive fails.
Timing faults are just as common. A transfer delay that is too short produces a hard transfer onto an unstable set — voltage dips, frequency excursions, and in the worst case a trip. A return delay that is too short produces a set that transfers back to mains before the supply has proven stable, and the site flickers twice.
Then there are the mechanical faults: contacts that have pitted, linkages that have stiffened, and interlocks that no longer prevent the two supplies from meeting. None of these are visible from a control panel indication.
The only way to know a changeover works is to make it work. A mains-failure simulation removes the mains supply under controlled conditions, with the site team present, and watches the whole sequence: detection, start signal, transfer, run, re-transfer and cool-down.
Done monthly, it keeps the mechanism moving, proves the settings are still correct, and catches the slow degradations — a stiff linkage, a drifting timer, a weakening battery in the panel — while they are still cheap to fix.
“A transfer switch that has not moved in a year is not standby equipment. It is an assumption.”
Jolony Technologies — generator service team
If your site has never simulated a mains failure, or if the last one was months ago, the changeover is unproven. A changeover assessment measures the timings, inspects the switch and exercises the sequence with your team present, then records what was found.
Jolony Technologies supports AMF panels and ATS equipment as thoroughly as the generator itself. Call the 24/7 line if your changeover has already failed to transfer.
More field notes from the technicians who keep standby generators ready to carry load.
A transfer switch that has not moved in a year is an unknown quantity. What a monthly simulation proves, what it costs, and how to record the result properly.
Read articleA set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. How maintenance, load testing and changeover work fit together.
Read articleHospitals, hotels, factories and technical sites carry different consequences for the same outage. How criticality should change testing frequency, spares and response.
Read articleCranking voltage, charge alternator output, terminal condition and charger behaviour — the starting circuit checks that explain most no-start calls before a spanner is lifted.
Most generator no-start calls are not engine failures. They are starting-circuit failures, and the battery sits at the centre of them. A set can have good oil, clean fuel and a healthy alternator and still refuse to crank, because the energy needed to turn a cold diesel engine has to come from somewhere — and that somewhere is a battery that is rarely tested between services.
This article walks through the checks we carry out on the starting circuit, in the order we carry them out, and explains why the battery accounts for the majority of the calls we attend.
An open-circuit reading taken with a multimeter tells you almost nothing about whether a battery can start an engine. A battery can sit at a healthy 12.6 volts and still collapse the moment it is asked to deliver several hundred amps into a starter motor.
What matters is cranking voltage — the voltage measured across the battery terminals while the engine is actually turning over. A set that drops below roughly 9.6 volts on a 12-volt system during cranking is telling you the battery cannot sustain the load. On a 24-volt system the equivalent figure is around 19.2 volts.
That single reading separates a battery problem from a starter problem, a wiring problem or a fuel problem, and it takes less than a minute to take.
A battery that tests well today can be flat in a month if the charge alternator is not doing its job. The charge alternator — the small belt-driven unit on the engine, not the main generating alternator — has to replace what the starter takes out, and keep the battery topped up while the set runs.
We check its output at the battery terminals with the engine running. A healthy system should show around 13.8 to 14.4 volts on a 12-volt set, and roughly double that on a 24-volt set. Anything below that, or a reading that drifts, points to a failing regulator, a worn brush pack, a slipping belt or a broken sense wire.
This is the most common reason a site reports the same flat battery twice. The battery was replaced, the real fault was never found, and the new battery fails on the same schedule as the old one.
Corrosion on a terminal, a loose clamp or a cable that has gone green under the insulation all add resistance to the starting circuit. The battery may be perfect, but the starter never sees the current.
We check terminal torque, clean and protect the posts, inspect the earth strap and the engine-to-chassis bonding, and measure voltage drop across the cables under cranking. A drop of more than half a volt across a cable or connection is a fault, not a characteristic.
“A battery that has been replaced twice in two years is almost never a battery problem. It is a charging or connection problem that was never diagnosed.”
Jolony Technologies — generator service team
A standby generator spends most of its life not running. That means the battery is not being charged by the engine — it is being maintained by a mains-powered battery charger, and that charger is doing all the work.
Chargers fail quietly. A blown fuse, a failed output stage or a charger that has been switched off at the wall will leave a battery slowly self-discharging for months, with nothing on site to show for it until the day the mains fails.
We verify charger output under load, check the fuse and supply, confirm the charge profile suits the battery type, and record the float voltage. On sites with a changeover panel, we also confirm the charger supply is fed from the correct side of the transfer switch — a charger fed from the generator side will not maintain the battery while the set is idle.
Every other starting fault announces itself. A failed starter makes a noise. A fuel problem produces smoke or a crank-no-fire pattern. A control fault throws an alarm. A battery simply goes flat, and the site discovers it at the worst possible moment.
Add to that the fact that batteries age on a calendar, not on running hours, and you have a component that degrades steadily while everything around it looks fine. That is why we treat the starting circuit as a scheduled item rather than a breakdown item.
If your generator has failed to start, or has been started on a battery that was replaced recently, the starting circuit needs to be measured rather than guessed at. A structured assessment records the readings, identifies the actual cause, and tells you whether the battery, the charger or the connections are responsible.
Jolony Technologies carries out starting-circuit checks as part of every generator health assessment and planned maintenance visit, and as a standalone diagnostic call-out. If your set will not start, call the 24/7 line and we will work the fault back to its cause.
More field notes from the technicians who keep standby generators ready to carry load.
When a set turns over but will not run, the fault is in fuel, air, compression or control. A systematic order of checks that finds the cause instead of guessing at parts.
Read articleA perfect set with a failed transfer is still a blackout. How AMF panels and ATS equipment fail quietly, and the checks that catch it before the mains does.
Read articleRadiator cores, coolant strength, fan drives and thermostats can all pass a short run and still fail a sustained one. Why cooling must be proven under real demand.
Read articleOver-crank, low oil pressure, high coolant temperature, overspeed and emergency stop — every trip is the set telling you something specific. How to read the message, and why resetting the alarm is not a repair.
A generator that shuts itself down is doing exactly what it was designed to do. The protection system exists to stop a set before a fault turns into a destroyed engine, and every trip it raises is a specific message about a specific system. The trouble is that the message is usually read as an inconvenience — the alarm is reset, the set is started again, and the underlying fault is left in place until it returns at the worst possible moment.
This article works through the shutdown alarms we see most often on standby sets, what each one is actually telling you, and how we work back from the code on the controller to the cause.
An over-crank trip means the controller allowed the starter to turn the engine for its full permitted period and the engine never reached running speed. The protection then locks out further cranking to protect the starter motor from burning out.
This is not a fault in the protection system — it is a starting fault that has been correctly detected. The cause sits in the starting circuit, the fuel system or the engine itself: a battery that cannot sustain cranking, a fuel supply that is not reaching the injectors, an air lock after a filter change, or a compression problem on an older set.
Resetting an over-crank and cranking again is the fastest way to destroy a starter. The right response is to measure cranking voltage, fuel pressure and the fuel shut-off solenoid before the starter is asked to work again.
Low oil pressure shutdown is the single most valuable protection on a diesel set, and the one most often treated as a nuisance. The controller is reading the oil pressure sender and comparing it against a threshold; when pressure falls below that threshold while the engine is running, the set is stopped.
There are two very different reasons this happens. The first is a genuine loss of oil pressure — low oil level, a blocked or collapsed filter, a worn oil pump, diluted oil from a fuel or coolant leak, or excessive bearing wear. The second is a false reading: a failed sender, a damaged wire, a poor earth or a controller threshold set incorrectly.
The distinction matters because the consequences are opposite. A false reading needs a sender or a wiring repair. A genuine low-pressure event needs the engine investigated before it runs again. We confirm with a mechanical gauge at the gallery port rather than trusting the sender alone, and we check the oil for fuel dilution and coolant contamination at the same time.
High coolant temperature shutdown triggers when the coolant sensor exceeds its threshold. On a standby set this alarm is often intermittent, and that intermittency is the clue: a set that idles happily for ten minutes in a monthly test and trips on temperature after twenty minutes at full load has a cooling problem that only appears under sustained demand.
The usual causes are a radiator core blocked with dust, insects or oil mist; a fan belt slipping under load; a thermostat stuck partially closed; a coolant mix that is too weak or too old; a pressure cap that no longer holds; or an air lock in the system after a coolant change.
Because the fault is load-dependent, it cannot be found by starting the set and watching it idle. Cooling has to be proven over a sustained run at real load, with the temperature recorded at intervals. That is the only test that reproduces the condition the alarm is reporting.
Overspeed protection stops the set when engine speed exceeds a safe limit, typically around 10 per cent above rated speed. It is a hard shutdown because an uncontrolled diesel can destroy itself in seconds.
An overspeed trip almost always points at the governor, the actuator or the control system rather than the fuel itself. A sticking actuator, a failed speed sensor, a corrupted controller setting or a mechanical governor linkage that has been disturbed can all produce it. Because the trip is rare and dramatic, it is tempting to reset it and carry on — but a set that has overspeeded once will do it again, and the second event may not be caught in time.
“An alarm that has been reset three times without a repair is not an intermittent fault. It is a fault with a schedule, and the schedule is set by the mains.”
Jolony Technologies — generator service team
An emergency stop trip is recorded by the controller as a distinct event, and it is worth checking before anything else is done. A stop button that has been pressed and not released, a damaged stop circuit, a loose terminal in the stop loop or a stop button left latched after a site drill will all hold the set in a stopped state.
We check the stop circuit end to end, confirm the button returns correctly, and verify that the controller records the trip as an emergency stop rather than a protection shutdown. Confusing the two sends a technician looking for an engine fault that does not exist.
The phrase “nuisance trip” is the most misleading in standby power. A protection system that trips has detected a condition outside its configured limits. Either the condition is real, or the sensing and configuration are wrong — and both need attention.
Repeated trips on the same code, trips that only appear under load, and trips that clear on reset all follow the same rule: the set is telling you something that has not yet been measured. The alternative — raising the threshold or disabling the protection to stop the alarm — removes the only thing standing between a fault and a failed engine.
If your generator has shut down on a protection trip, or has been reset and restarted more than once on the same alarm, the set needs to be measured rather than reset. A structured diagnostic visit records the event history, confirms each protection input, and identifies whether the cause is mechanical, electrical or a configuration error.
Jolony Technologies attends shutdown-alarm faults as part of planned maintenance and as standalone diagnostic call-outs. If your set is tripping, call the 24/7 line with the alarm code and we will work the fault back to its cause.
More field notes from the technicians who keep standby generators ready to carry load.
When a set turns over but will not run, the fault is in fuel, air, compression or control. A systematic order of checks that finds the cause instead of guessing at parts.
Read article
Radiator cores, coolant strength, fan drives and thermostats can all pass a short run and still fail a sustained one. Why cooling must be proven under real demand.
Read articleA set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. How planned maintenance, load testing and changeover work fit together.
Read articleRadiator cores, coolant strength, fan drives and thermostats can all pass a short run and still fail a sustained one. Why cooling must be proven under real demand.
Cooling faults are the most patient faults a generator has. They do not stop the set starting, they do not throw an alarm on a short run, and they do not show up in a weekly test. They wait for the night the set has to carry the building for an hour, and then they shut it down.
Every cooling fault we find has the same signature: it needs heat and time to appear. That is why a two-minute start proves nothing about the cooling system, and why we insist on a sustained loaded run.
The radiator is a heat exchanger, and its performance depends on air passing freely through the core. Dust, pollen, insects, oil mist and years of accumulated debris all reduce that airflow. From the outside the core can look acceptable while the fins behind the face are packed solid.
We inspect the core properly — front and back, with a light — and clean it where needed. On sets in dusty or oily environments this is a scheduled task, not a repair.
Coolant does two jobs: it carries heat and it protects the system against corrosion and freezing. Both degrade with time. A mix that has drifted too weak will not protect the block; a mix that has drifted too strong transfers heat less effectively and can stress the water pump.
We test concentration and condition rather than topping up on assumption, and we check for the signs of a system that has been topped up repeatedly with water — a weak mix, corrosion products in the coolant, and a radiator that is slowly silting up.
The fan has to move air, and the drive has to keep moving it when the belt is hot and under load. A belt that is correctly tensioned when cold can slip once the engine bay reaches working temperature, and a slipping belt shows up as a slow temperature climb rather than an obvious fault.
Airflow is a system, not a component. We check that the radiator is not recirculating its own hot air, that the engine bay has adequate inlet and outlet area, that the exhaust is not heating the intake path, and that nothing has been stacked against the louvres since the last visit.
A thermostat that opens late, or only partially, restricts flow exactly when the set needs it most. A water pump with a worn impeller moves less coolant than the system was designed for. Both produce the same symptom: a set that runs cool at light load and climbs steadily at rated load.
Neither fault is visible without running the set under load long enough for temperature to stabilise, which is why they are so often found during a load test rather than a service.
“A cooling system that has never been asked to reject heat at rated load has never been tested. It has only been observed.”
Jolony Technologies — generator service team
If your generator has never been run at rated load long enough for temperature to stabilise, its cooling system is unproven. A load test with temperature recorded at each step will show whether the set can hold its rating — and whether anything in the cooling path needs attention before the next outage.
Jolony Technologies carries out cooling inspections and load testing as part of planned maintenance and as standalone assessments. Call the 24/7 line if your set has already tripped on high coolant temperature.
More field notes from the technicians who keep standby generators ready to carry load.
A set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. How maintenance, load testing and changeover work fit together.
Read articleOver-crank, low oil pressure, high coolant temperature, overspeed and emergency stop — each trip is a message from the set. How to read it, and why resetting it is not a repair.
Read articleRunning hours, condition, parts availability and the cost of downtime all point in different directions. A practical framework for the decision owners put off longest.
Read articleWater, sediment, microbial growth and ageing fuel quietly degrade a standby tank. What to test, how often to drain, and why filters are the last line of defence.
A standby generator has an unusual relationship with its fuel. A working set burns through a tank in days. A standby set may sit on the same diesel for two years, and every one of those months is a month the fuel is changing.
Diesel is not a stable product. It oxidises, it absorbs moisture, it grows things, and it drops sediment. The tank that was filled clean can be a problem by the time the set is asked to run on it.
Water gets into a tank through condensation, through the fill point, through a damaged vent or through a delivery of contaminated fuel. Because water is denser than diesel, it collects at the bottom — exactly where the fuel take-off usually sits.
Water in the fuel does two kinds of damage. It corrodes the tank and the fuel system from the inside, and it reaches the injection equipment, where it causes damage that is expensive to repair. It also creates the conditions for microbial growth.
The interface between a layer of water and a layer of diesel is a habitat. Bacteria and fungi grow there, feeding on the fuel and the water, and produce a dark sludge that blocks filters, coats tank walls and settles in lines and lift pumps.
Once established, microbial contamination does not clear itself. It needs the tank drained, cleaned and the fuel treated or replaced — and it needs the source of the water found and fixed, or it will return.
Diesel oxidises slowly in storage. The process produces gums and varnish that darken the fuel and deposit on injectors, pumps and filters. Fuel that has been in a warm tank for two years is not the same product that was delivered.
We look at colour, clarity and smell, and where a tank is large or the fuel is old we recommend sampling and testing rather than guessing. The cost of a fuel test is trivial next to the cost of a set that will not run.
Filters protect the injection equipment, and they do it by collecting everything the tank has released. That means a filter that blocks quickly is telling you something about the fuel, not about the filter. Replacing filters without investigating the tank is treating a symptom.
Water separators and sedimenters need draining on a schedule, and the water they collect needs to be measured, not just tipped away. A separator that yields water every month is a tank with a problem.
“A generator that will not start on old fuel is not a generator fault. It is a fuel-storage fault that the generator has just discovered.”
Jolony Technologies — generator service team
If your standby tank has not been checked in the last twelve months, the fuel in it is an unknown quantity. A fuel-system inspection drains and measures the water, examines the fuel and tells you whether the tank needs cleaning, the fuel needs treating, or the storage arrangement needs fixing.
Jolony Technologies includes fuel-system checks in every generator health assessment and planned maintenance visit. Call the 24/7 line if your set has already failed to run on stored fuel.
More field notes from the technicians who keep standby generators ready to carry load.
When a set turns over but will not run, the fault is in fuel, air, compression or control. A systematic order of checks that finds the cause instead of guessing at parts.
Read articleCranking voltage, charge alternator output, terminal condition and charger behaviour — the starting circuit checks that explain most no-start calls before a spanner is lifted.
Read articleRunning hours, condition, parts availability and the cost of downtime all point in different directions. A practical framework for the decision owners put off longest.
Read articleWhen a set turns over but will not run, the fault is in fuel, air, compression or control. A systematic order of checks that finds the cause instead of guessing at parts.
Crank-no-fire is one of the most useful faults a generator can give you. The set is turning over at the right speed, which means the battery, starter and starting circuit are all working. The problem is somewhere between the fuel tank and the combustion chamber — and it can be found in a fixed order.
The mistake we see most often is parts being changed before the cause is established. A set that will not fire gets a new fuel filter, then a new lift pump, then a set of injectors, and the fault is still there. The order below exists to avoid that.
Before anything else, confirm what the set is doing. A slow crank that sounds like a start attempt is a starting-circuit problem, not a fuel problem. A set that fires briefly and dies is a different fault again. Cranking speed, sound and any smoke from the exhaust all narrow the field before a spanner is lifted.
White or grey smoke while cranking means fuel is reaching the cylinders but not burning — a compression or timing issue. No smoke at all points to fuel not arriving. That single observation splits the diagnosis in two.
We start at the tank and work forward. Level, water and contamination, the state of the filters, the lift pump output, the condition of the lines and the operation of the shut-off solenoid. A fuel shut-off that is not opening will produce a perfect crank-no-fire with nothing else wrong.
Where fuel is reaching the injection pump, we check delivery and timing. Where it is not, we work back until we find where it stops. This is measurement, not substitution.
A diesel needs air as much as it needs fuel. A blocked air filter, a collapsed intake hose, a seized turbocharger or an intake path blocked by debris will all produce a set that cranks and will not run. On standby sets in dusty plant rooms this is more common than most people expect.
We check the intake path from the filter to the manifold, and confirm the turbocharger turns freely where one is fitted.
If fuel and air are both arriving and the set still will not fire, compression is next. Worn rings, a leaking valve, a blown head gasket or a valve clearance that has drifted out of specification will all drop compression below the point where diesel will ignite.
Compression testing is not guesswork. It produces numbers per cylinder, and those numbers tell you whether the engine is mechanically sound or whether it needs work.
Modern sets are controlled by a panel that can prevent starting for reasons that have nothing to do with the engine. A protection input that is active, a sensor reading out of range, an emergency stop that is latched, or a controller configuration fault will all hold a perfectly healthy set in a crank-no-fire state.
We read the controller, check the active inputs and confirm the protection settings before condemning anything mechanical.
“Crank-no-fire is not a mystery. It is fuel, air, compression or control — and one of the four will show itself when you measure instead of replace.”
Jolony Technologies — generator service team
If your generator cranks and will not fire, the fault can be found in a fixed order and confirmed by measurement. A diagnostic call-out records what was found, what was done, and the test results that prove the set is serviceable again.
Jolony Technologies works starting faults back to their cause rather than replacing parts on a guess. Call the 24/7 line if your set is down.
More field notes from the technicians who keep standby generators ready to carry load.
Cranking voltage, charge alternator output, terminal condition and charger behaviour — the starting circuit checks that explain most no-start calls before a spanner is lifted.
Read articleOver-crank, low oil pressure, high coolant temperature, overspeed and emergency stop — each trip is a message from the set. How to read it, and why resetting it is not a repair.
Read articleWater, sediment, microbial growth and ageing fuel quietly degrade a standby tank. What to test, how often to drain, and why filters are the last line of defence.
Read articleA service record is evidence. Measured readings, load test results, parts used and the next due date — the six-part document that stands up when a claim is made.
When a standby system fails and a claim follows, the question is rarely whether the generator was serviced. The question is whether anyone can prove what was checked, what was found and what was done about it. A record that says “serviced” proves nothing. A record with readings in it does.
This is the difference between maintenance as a habit and maintenance as evidence — and it is the difference that decides how a claim is handled.
The record has to identify the set unambiguously: make, model, rating, serial number and location, plus the changeover arrangement it is connected to. Without that, a record cannot be tied to the equipment, and a claim can be argued on the basis that the service was for something else.
On multi-set sites this matters even more. Two identical generators in the same plant room need two separate records.
Before any work begins, the state of the set should be written down: running hours, visible defects, leaks, corrosion, alarm history and anything the site team reported. This establishes the starting point and shows whether a defect was pre-existing or introduced.
It also protects the contractor and the owner equally. A record that starts with condition as found is a record both sides can rely on.
This is the part most service records are missing. “Battery in good condition” is an opinion. “Open-circuit 12.62 V, cranking 10.4 V, charge alternator 14.1 V” is evidence. The same applies to coolant concentration, insulation resistance, and voltage, frequency, current and temperature under load.
Readings allow a trend to be built across visits. A cranking voltage that has fallen from 11.2 to 10.4 volts over two years is a battery approaching the end of its life, and the record shows it before the failure does.
Every task carried out should be listed against the service schedule, with parts and consumables recorded by description and quantity. This is what allows a failure to be traced back to a component, and it is what shows that the correct parts were fitted rather than whatever was available.
A service record that ends with “set started and ran” is incomplete. The start, load, run and shutdown sequence should be proven and the outcome written down, and the AMF / ATS changeover should be exercised with the timings recorded.
Where a load test has been carried out, the load steps applied and the readings taken at each step belong in the record. This is the strongest single piece of evidence in a standby-power file, because it shows the system performing under real demand.
Finally, defects should be risk-rated with a clear recommendation: repair, replace or monitor. A record that lists a defect without a recommendation leaves the decision — and the responsibility — undefined.
“A service record is not paperwork. It is the only thing that can tell an insurer, an auditor or a new owner what state the standby system was actually in.”
Jolony Technologies — generator service team
If your generator file contains invoices but no readings, you have a cost record rather than a service record. A structured assessment produces the six-part document, with the measurements and test results that stand up when they are needed.
Jolony Technologies issues a written report after every visit, whether it is a planned service, a diagnostic call-out or a load test. Call the 24/7 line if you need your standby system documented.
More field notes from the technicians who keep standby generators ready to carry load.
A transfer switch that has not moved in a year is an unknown quantity. What a monthly simulation proves, what it costs, and how to record the result properly.
Read articleA set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. How maintenance, load testing and changeover work fit together.
Read articleHospitals, hotels, factories and technical sites carry different consequences for the same outage. How criticality should change testing frequency, spares and response.
Read articleA transfer switch that has not moved in a year is an unknown quantity. What a monthly simulation proves, what it costs, and how to record the result properly.
Most sites test their generator. Very few test their changeover. The generator gets a weekly start, sometimes a monthly run, occasionally a load test. The transfer switch sits there, closed on the mains side, untouched for months at a time.
Then the mains fails, and the switch is asked to do the one thing it has not done since it was installed. A monthly mains-failure simulation exists to make sure that moment is not the first time.
A simulation removes the mains supply under controlled conditions and watches the entire sequence: mains sensing and detection, the start signal to the generator controller, the set starting and stabilising, the transfer of load, the run on generator, the return of mains, the re-transfer and the cool-down run.
Every one of those steps is a potential failure point, and none of them are tested by starting the generator on its own. A set can start perfectly and the building still stay dark because the switch never moved.
Annual testing proves the system worked once a year. Monthly testing keeps it working. The difference is mechanical: contacts that move regularly stay free, linkages stay lubricated in the right places, and timers and relays do not seize from inactivity.
Monthly simulation also builds a record. Twelve results a year show a trend — a transfer time that has crept from eight seconds to fourteen, a re-transfer delay that has drifted, a battery in the panel that is no longer holding up. Those trends are visible long before they become failures.
A simulation is not a casual act. It interrupts the supply to the building, so it has to be planned with the site, scheduled around operations, and carried out with the right isolation and permits in place. On critical sites it may need to be done outside working hours, or in stages where the installation allows it.
We agree the method before the visit, confirm who is on site and what the consequences of a failed transfer would be, and have a fallback plan in place. A simulation that goes wrong should be an inconvenience, not an incident.
The value of a simulation is in what is written down. Detection time, start delay, time to voltage and frequency acceptance, transfer time, run duration, re-transfer delay and cool-down period should all be measured and recorded, along with any alarms, indications or anomalies.
Where a timing is outside the agreed window, it is a finding. Where a timing has changed since the last simulation, it is a trend. Both belong in the report.
“A transfer switch that has not moved in a year is not standby equipment. It is an assumption — and assumptions are what fail at two in the morning.”
Jolony Technologies — generator service team
If your site has never simulated a mains failure, or if the last one was more than a month ago, the changeover is unproven. A changeover assessment measures the timings, inspects the switch and exercises the sequence with your team present.
Jolony Technologies carries out mains-failure simulations as part of planned maintenance and as a standalone service. Call the 24/7 line if your changeover has already failed to transfer.
More field notes from the technicians who keep standby generators ready to carry load.
A perfect set with a failed transfer is still a blackout. How AMF panels and ATS equipment fail quietly, and the checks that catch it before the mains does.
Read articleA set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. How maintenance, load testing and changeover work fit together.
Read articleHospitals, hotels, factories and technical sites carry different consequences for the same outage. How criticality should change testing frequency, spares and response.
Read articleHospitals, hotels, factories and technical sites carry different consequences for the same outage. How criticality should change testing frequency, spares and response.
Two sites can have identical generators and completely different standby-power requirements. On one, a two-hour outage is an inconvenience. On the other, it is a clinical incident, a production loss or a breach of a service commitment.
Criticality is not a property of the generator. It is a property of what the generator protects — and it should change how the system is tested, spares, monitored and supported.
The first question is not how big the generator is. It is what happens in the first minute, the first hour and the first day without power. Life safety, environmental risk, product loss, data loss, contractual penalties and reputational damage all weigh differently, and the answer decides everything downstream.
A site where the answer is “the lifts stop and the lights go out” needs a well-maintained system. A site where the answer is “patients on ventilators” needs a system designed, tested and supported to a different standard entirely.
A low-criticality site can reasonably run a monthly start and an annual load test. A high-criticality site cannot. There, the changeover should be simulated monthly, load testing should be more frequent, and the protection and shutdown functions should be proven on a schedule rather than assumed.
The reason is simple: the more consequential a failure is, the less acceptable an untested assumption becomes. On a critical site, every part of the sequence that has not been exercised recently is a risk that has been accepted without being acknowledged.
A single generator is a single point of failure. So is a single transfer switch, a single fuel supply, a single battery charger and a single control panel. On critical sites, each of those needs to be considered deliberately: either duplicated, or monitored closely enough that a failure is detected before it matters.
Where redundancy exists, it has to be tested as redundancy — not just as two independent sets. A standby set that has never been run in parallel, or a changeover that has never been exercised with the second set, is not proven redundancy.
Critical sites cannot wait for a part to be ordered. Common failure items — batteries, belts, filters, sensors, fuses, control components — should be held on site or by the service provider, matched to the actual equipment installed.
Response arrangements matter too. A 24/7 line that reaches a qualified person, a defined response time, site access arrangements that work outside office hours, and a technician who has seen the installation before all shorten the gap between a failure and a running set.
On a critical site, the service record is not just compliance evidence — it is the operational history of the system. Readings trended over time, defects risk-rated, and next actions tracked to completion are what allow a decision to be made about replacement or overhaul before a failure forces it.
“Criticality is not about how big the generator is. It is about what stops when the generator does not start.”
Jolony Technologies — generator service team
If your standby system is tested on a schedule that was set for convenience rather than consequence, it is worth reviewing against what an outage would actually cost. A criticality review looks at the installation, the testing regime, the spares position and the response arrangements, and tells you where the gaps are.
Jolony Technologies supports commercial, industrial and technical sites, including hospitals, hotels, factories and telecom facilities. Call the 24/7 line if your standby system needs to be assessed against a higher standard.
More field notes from the technicians who keep standby generators ready to carry load.
A transfer switch that has not moved in a year is an unknown quantity. What a monthly simulation proves, what it costs, and how to record the result properly.
Read articleA service record is evidence. Measured readings, load test results, parts used and the next due date — the six-part document that stands up when a claim is made.
Read articleRunning hours, condition, parts availability and the cost of downtime all point in different directions. A practical framework for the decision owners put off longest.
Read articleRunning hours, condition, parts availability and the cost of downtime all point in different directions. A practical framework for the decision owners put off longest.
Every standby generator reaches a point where the owner has to decide what to do with it. Repair it again, overhaul it properly, or replace it. The decision gets postponed because it is genuinely difficult — and because a set that still starts feels like it is still working.
The framework below is the one we use when advising owners. It is not a formula, but it does separate the questions that should drive the decision from the ones that usually do.
Age is the least useful number in the decision. A well-maintained set at fifteen years can be in better condition than a neglected one at six. What matters is measured condition: compression, oil analysis, insulation resistance, cooling performance, control and protection integrity, and the state of the alternator.
A structured assessment produces those readings. Without them, the decision is being made on impressions.
Running hours matter, but they have to be read alongside duty. A standby set with 400 hours on it has spent most of its life idle, which brings its own problems: fuel degradation, seal drying, corrosion in the cooling system and a battery that has lived on a charger. A prime-power set with 12,000 hours has genuinely worn components.
The question is not how many hours, but what those hours did to the machine — and what the idle hours did in between.
This is often the deciding factor. A mechanically sound set becomes a liability when critical parts are no longer available — an injection pump, a control board, an alternator winding, a specific sensor. Where a part has to be sourced second-hand or manufactured, the risk of a long outage rises sharply.
Control and protection obsolescence is the most common problem we see. A set with a healthy engine and alternator can be effectively unserviceable because its controller is no longer supported.
Repair and replacement costs are easy to compare. The cost of a failure is harder to quantify and usually larger. On a site where an outage stops production, closes a facility or breaches a service commitment, the economics of replacement change completely — because the comparison is not repair cost against replacement cost, it is repair cost against the expected cost of failure.
Where the consequence is high, reliability becomes the primary criterion and cost becomes secondary. Where the consequence is low, a repaired set may be entirely the right answer for years to come.
An overhaul sits between repair and replacement. It is a planned, comprehensive restoration — engine work, cooling system, fuel system, electrical inspection, control and protection review — carried out on a set whose fundamentals are sound. Done properly, it resets the maintenance baseline and gives years of further service at a fraction of replacement cost.
It only makes sense where parts are available and the alternator and control system are supportable. Where either of those fails, overhaul is money spent on a set that will still need replacing.
“The question is not whether the generator still starts. It is whether it will still start, under load, on the night it is needed — and whether you can get the parts to fix it if it does not.”
Jolony Technologies — generator service team
If you are deciding what to do with an ageing set, the decision should be based on readings and parts availability, not on how it sounded last time it ran. A condition assessment produces the measurements, identifies the obsolescence risks and gives you a recommendation with the reasoning behind it.
Jolony Technologies carries out condition assessments on ageing standby sets and advises honestly on repair, overhaul or replacement. Call the 24/7 line if a decision is already overdue.
More field notes from the technicians who keep standby generators ready to carry load.
A set can start cleanly, idle smoothly and still fail the moment it is asked to take the building. How maintenance, load testing and changeover work fit together.
Read articleRadiator cores, coolant strength, fan drives and thermostats can all pass a short run and still fail a sustained one. Why cooling must be proven under real demand.
Read articleWater, sediment, microbial growth and ageing fuel quietly degrade a standby tank. What to test, how often to drain, and why filters are the last line of defence.
Read articleIf something in these articles describes your site, the next step is a structured assessment. We will tell you what your standby system is actually doing — and what needs attention first.