Generator repair

Signs something is wrong

Repairs often start with a warning light, an app alert or a missed weekly exercise. Other signs include a unit that starts and then stops, rough running, smoke, unusual noise, or a generator that runs but does not power the house. That last one can point to the transfer switch rather than the generator.

Some problems only show up under load, so a unit that passes its weekly exercise can still struggle in a real outage. That is one more reason to have it checked once a year.

What you can safely check

Look at the display or app and write down any fault code. Check that the generator is in automatic mode. See whether a breaker on the generator or in the transfer switch has tripped, but do not open any covers. That is about it. Everything inside the enclosure involves fuel, battery current and high voltage, and should be handled by a trained technician.

If you smell gas near the generator or anywhere in the house, leave and call 911 or the gas utility from outside. Do not try to restart the unit.

Common repairs

Many calls end with a fairly simple fix. Others take parts and a second visit. A technician will usually test first and then quote.

Ask whether the technician carries common parts for your brand, which can shorten the wait.

• Dead or weak starting battery
• Failed battery charger
• Fouled spark plugs or clogged air filter
• Low oil pressure or oil leaks
• Controller faults and software updates
• Transfer switch problems
• Damage from rodents nesting in the enclosure

Repair or replace

Age, condition and parts availability all matter. A well-kept unit can run for many years, while a neglected one may need a major engine repair. Ask for the repair quote in writing alongside the price of a new unit, and ask whether the new unit would change your transfer switch, fuel line or permit needs. Angi notes that major engine work can cost far more than a typical repair visit, so it is worth comparing.

Before the next storm

The best time to find a fault is on a calm day. If your generator has not been serviced in over a year, booking maintenance now may save a repair call in the middle of an outage, when every technician in the county is busy.

Technicians are easiest to book before storm season, when calls are fewer.

What to have ready when you call

Have the generator's brand, model and serial number, usually on a label inside or on the enclosure, plus the fault code and roughly when the problem started. Note whether the unit was serviced recently and whether the problem happens during the weekly exercise, during outages or both. Photos of the display help too. Clear details let a technician bring the likely parts on the first visit, which can save you a second trip charge.

Questions homeowners ask