Generator repair

Common causes

Dead batteries lead the list. Low oil shutdowns, clogged filters, worn plugs, controller errors and transfer switch faults follow. On rural properties, rodent damage to wiring and an empty propane tank are also common reasons a unit stops.

What to have ready

Help the technician by noting:

• Brand, model and serial number
• Fault code on the controller
• Propane tank level, if you use propane
• What happened: no start, start then stop, or runs without powering the house
• Last service date

Safety

Do not open the generator to work on the engine, wiring or fuel line. If you smell gas, leave the area and call 911 or your propane company from a safe place. If you use a portable generator while you wait for a repair, keep it outside, far from windows and doors, never in a garage, barn or basement, and connect it only through a transfer switch or interlock installed by an electrician.

Repair or replace

Most repairs are worth doing. Replacement starts to make sense when the unit is old, needs major engine work, lacks parts, or no longer fits the house's needs. The existing pad, fuel line and transfer switch can sometimes be reused. A good technician gives you both options with prices. See standby generator installation.

Preventing it next time

Service visits catch most of these problems early. See generator maintenance.

While you wait for a repair

If the generator fails during a long outage, plan for the house to be without water as well as power if you are on a well. Fill clean containers with water before a forecast storm, keep a supply of bottled water, and keep freezer and refrigerator doors closed. Use flashlights rather than candles. If the house gets cold, move to a warm place rather than using a stove or grill indoors for heat. After big storms, technicians are in demand across the area, so report a problem as soon as you notice it, even if the power is still on.

Questions homeowners ask