San Diego · Generator Services
Generator Repair
Diagnostics, repair and scheduled maintenance for standby, portable and diesel generators, on every major brand and whoever installed it.
Generator Repair · San Diego
What Generator Repair And Servicing Covers
A generator is an engine that spends almost all of its life switched off and is then expected to work perfectly on ten seconds notice. That is a demanding thing to ask of any machine, and it is why the units that fail during an outage are nearly always the ones nobody looked at. Our repair and maintenance work covers diagnostics and repair when something has gone wrong, and scheduled servicing so it does not. That includes generator oil changes, filters, plugs, valve lash, coolant service, battery testing and replacement, fuel system work, controller diagnostics, automatic transfer switch inspection, load bank testing, and diesel generator repair on plant that has been sitting for years. We work on Generac, Kohler, Cummins, Champion, Briggs & Stratton, Onan, Caterpillar, MTU and most other brands, on units we installed and units we have never seen before. Emergency generator repair calls go out of the Commercial Street yard across San Diego County, and where a repair will take days rather than hours we can stage a rental unit so nobody sits in the dark waiting for a part.
Why Use Us For Generator Service
Anybody can change oil. The value in a service visit is in what gets noticed while the cover is off: a battery that is still starting the engine today but will not in January, a coolant hose going soft, a fuel filter that is loading up faster than the hours justify, a transfer switch with pitted contacts, a controller history full of warnings nobody read. Our techs run generator work full time rather than fitting it around electrical jobs, so they know what those early signs look like on each brand. We carry the common wear parts on the truck, so a routine failure gets fixed on the first visit instead of scheduled for a second. And we tell you plainly when a unit is not worth repairing, with the numbers, rather than quoting a rebuild that costs most of a replacement.
- Factory-level familiarity with Generac, Kohler, Cummins, Onan, Champion, Briggs, Caterpillar and MTU.
- Emergency generator service dispatched across the county, with priority response for contract customers.
- Common wear parts carried on the truck: batteries, filters, plugs, belts, hoses and relays.
- Annual generator maintenance plans covering oil changes, full inspection and a run under load.
- Load bank testing for commercial and code-mandated systems, with documentation.
- Straight advice on repair versus replace, with the cost of both rather than only the one that suits us.
Reasons To Book A Service Call
The situations that should put a technician in front of your generator:
It failed its weekly exercise
The self-test is the machine telling you something before you need it. A missed or failed exercise cycle is the single most useful early warning a standby unit gives, and it is the one most often ignored until an outage.
It starts but will not take the load
Usually a transfer switch problem, a controller setting or an engine that cannot make rated power because of fuel, air or a cooling issue. Diagnosis matters here, because replacing parts by guesswork gets expensive fast.
Annual service is due
Manufacturers require documented annual maintenance to keep the warranty valid, and after the warranty ends the engine still needs it. Oil, filters, plugs, coolant, battery, transfer switch and a load run, once a year at minimum.
It has not run in a year or more
Old fuel, varnished carburetors on gas units, gelled or contaminated diesel, dead batteries and seized components. Vacation properties, inherited units and businesses that changed hands are the classic cases.
The controller is showing a fault or warning
Yellow warnings and red alarms both mean something. Some derate the unit quietly and some prevent it starting at all, and the fault history often explains a problem that has been building for months.
A load bank test is required or overdue
Life safety, medical, high-rise and data facilities have to test annually under load and keep records. Beyond compliance, it is the only way to prove a lightly loaded unit will genuinely carry the building.
Tell us the brand, roughly how old it is and what it is doing, and we will tell you on the phone whether it sounds like a visit or a part. Call: (619) 257-2867
How A Service Call Works
Diagnose first, quote second, repair third. We do not swap parts hoping something helps.
1. Diagnosis
We pull the controller fault history, check fuel, oil, coolant and battery, inspect the transfer switch, and try to reproduce the failure. On diesel plant that includes fuel condition and filter state, which explains a surprising share of no-start calls.
2. Quote before the work
You get the cause, the fix, the part cost and the labor before anything happens. If the sensible answer is replacement rather than repair, we will say so and show the arithmetic instead of quietly quoting a rebuild.
3. Repair or service
Routine maintenance is a single visit: oil and filter, air and fuel filters, plugs, valve lash where the hours call for it, coolant, battery load test, transfer switch inspection and a run under load. Component repairs happen on the truck stock where we have the part and next day where we do not.
4. Prove it and document it
A simulated outage at minimum, a load bank test where the system requires one. You get a written record of what was done and what to watch, which is what a warranty claim or an inspector will ask for.
Maintenance, Diesel Work, Emergencies And Contracts
The kinds of work that come under repair and servicing:
Annual generator maintenance
The baseline visit: engine oil and filter, air filter, fuel filter, spark plugs on gas units, coolant condition, belts and hoses, battery load test and terminals, enclosure and mounting, transfer switch inspection and exercise, controller history review, and a run under load. On a residential standby unit this takes about ninety minutes once a year.
Generator oil change intervals
Air-cooled residential units typically want an oil change every 100 to 200 running hours or annually, whichever comes first, and the first change comes early at around 25 hours on a new unit. Liquid-cooled and diesel units run longer intervals by hours but still want annual service. Exercise cycles accumulate hours faster than owners expect.
Diesel generator repair
Injectors, fuel pumps, filters, glow plugs, cooling systems, alternators and controllers, plus the fuel itself. Stored diesel picks up water and microbial growth, which blocks filters at the worst moment, so fuel polishing and tank cleaning are part of diesel work rather than an extra.
Emergency generator repair
Same-day dispatch where the schedule allows, with priority for contract customers. If the fix needs a part that is not on the truck, we can bring a rental unit so a business with refrigeration or a household with medical equipment is covered while we wait.
Transfer switch service
The switch is half the system and gets a fraction of the attention. Contacts pit, control boards fail, and a unit that starts perfectly is useless if the switch will not transfer. Every service visit includes an inspection and an operational test of the switch.
Load bank testing
A resistive load bank brought on site to run the unit at its nameplate rating. Required annually for code-mandated systems, valuable on any lightly loaded standby unit, and the only honest way to certify that a machine will do what its plate says.
Service contracts
Commercial generator maintenance agreements set out the scope, the visit frequency and the emergency response time in writing. Residential plans are simpler: one annual visit, a reminder that arrives before fire season rather than after, and priority if something goes wrong.
What Generator Repair And Servicing Costs
Servicing is quoted per visit or as an annual plan; repairs are quoted after diagnosis. What drives the number:
- Scope of the visit. A standard annual service on an air-cooled residential unit is a flat rate; adding coolant service, valve adjustment or a load bank test raises it.
- Unit size and type. A 22kW air-cooled unit takes far less oil, coolant and time than a 400kW diesel with a base tank.
- Contract versus one-off. An annual plan costs less per visit than individual service calls and includes priority response, which is the part that matters at 2am.
- Parts. Batteries, filters, plugs, belts and hoses are stocked and cheap. Controllers, alternators, transfer switch boards and injectors are quoted after diagnosis.
- Emergency versus scheduled. Same-day and after-hours calls carry a premium because they sit outside the route.
- Travel. Everything inside our normal county routes is included; back-country properties east of Alpine and Ramona carry a flat trip charge quoted up front.
An annual service plan is the cheapest insurance available on a standby unit, and it costs a fraction of one emergency service call. If a unit turns out to be past economical repair, we will price a replacement from the home standby or commercial standby range and let you compare properly. We also cover standby power and generator rentals, so a unit that is past saving does not mean starting again with somebody else.
Frequently Asked Questions
How often does a generator need maintenance?
Once a year at minimum for a residential standby unit, which covers oil and filter, air and fuel filters, spark plugs, coolant, battery load test, transfer switch inspection and a run under load. Manufacturers also specify hour-based intervals, typically an oil change every 100 to 200 running hours, and the weekly exercise cycle accumulates those hours faster than people expect. Commercial and code-mandated systems go on semi-annual or quarterly visits plus an annual load bank test. Skipping annual service voids most manufacturer warranties.
My generator will not start. What is usually wrong?
In rough order of frequency: a dead or weak battery, stale fuel and a varnished carburetor on a gas unit that never ran under load, low oil or coolant tripping a safety shutdown, a blocked fuel filter on a diesel, and a controller fault or a switch left in the wrong position after somebody worked on it. Almost all of those are cheap to prevent and irritating to discover during an outage, which is the whole argument for annual servicing.
Do you repair generators you did not install?
Yes, and most of our repair work is on units somebody else sold. We service Generac, Kohler, Cummins, Onan, Champion, Briggs & Stratton, Caterpillar, MTU and most other brands regardless of origin. We carry common wear parts on the truck and can order almost anything else for next-day delivery. Being outside the original warranty does not stop us working on it.
How quickly can you get to an emergency?
Contract customers get priority dispatch, and within the San Diego metro that usually means same day. Non-contract emergency calls are worked in as the schedule allows, which is often same day and occasionally next. If the repair needs a part we do not have, we can stage a rental unit on site so a business with refrigeration or a household with medical equipment is not exposed while we wait for it.
How much does an annual generator service cost?
A standard annual visit on a residential air-cooled standby unit is a flat rate that covers oil and filter, air and fuel filters, plugs, battery test, transfer switch inspection and a run under load. Larger liquid-cooled and diesel units cost more because they take more oil, more coolant and more time. Annual plans work out cheaper per visit than single service calls and include priority response. Call and we will quote for your specific unit.
Is it worth repairing an old generator or should I replace it?
It depends on hours, condition and what has failed. A fifteen-year-old air-cooled residential unit needing a controller and an alternator is usually not worth it, because the parts approach the cost of a new machine with a fresh warranty and better fuel efficiency. A well-maintained liquid-cooled or diesel unit with thousands of hours left in the block is almost always worth repairing. We give you both numbers and let you decide rather than steering you toward the sale.
Need a generator in San Diego?
Tell us the address and what you need backed up, and we will come out and put a free estimate in your hands.
Or call us now: (619) 257-2867