Generator repair

Common problems

Most standby generator problems trace back to a short list of causes. A dead or weak battery is the most common reason a unit will not start. Other frequent issues include low oil shutdowns, clogged air filters, worn spark plugs, controller faults, a transfer switch that fails to move the load, and fuel supply problems. Animals nesting in the enclosure and debris blocking vents also cause trouble.

What to note before calling

A few details help the technician arrive with the right parts:

• The brand and model, printed on the unit or in the manual
• Any fault code or warning light on the controller
• Whether the weekly self-test has been running
• When it was last serviced
• Whether it starts but will not take the load, or will not start at all

Safety first

Do not open the generator to work on the engine, wiring or fuel line yourself. Standby units are connected to your home's electrical system and to gas or propane, and both can injure you. If you smell gas, leave the area and call 911 or the gas utility. If the house is dark and you bring out a portable generator, run it outdoors away from windows and never connect it to the house without a proper transfer switch or interlock.

Repair or replace

Home standby generators can last many years with care, and most repairs are worth doing. When a unit is old, needs a major engine repair, or is too small for the house as it is now, replacing it may make more sense. A good technician will give you both options with prices. If you replace it, the existing pad, fuel line and transfer switch may sometimes be reused, which lowers the cost. See standby generator installation.

Avoiding the next repair

Yearly service catches most of the problems above before they leave you in the dark. See generator maintenance for what a visit covers.

Questions homeowners ask