Generator Maintenance: What a Standby System Actually Needs

The self-test cycle

Most standby generators run a brief automatic self-test on a set schedule (commonly weekly), starting the engine for a few minutes without transferring your home's power. This is normal and it's the system's own way of catching a problem before an actual outage. If you notice the generator running briefly at the same time each week, that's this self-test, not a malfunction.

What routine maintenance covers

• Oil and filter changes on a schedule set by the manufacturer, typically tied to running hours, similar to a car.
• Battery check, since the automatic start relies on a battery, and a dead battery is one of the most common reasons a standby generator fails to start during an actual outage.
• Air and fuel filter inspection.
• A load test, confirming the unit can actually carry its rated load, not just start up.

Who should do it

Most manufacturers recommend annual professional service at minimum, and some warranties require it to stay valid, so check your specific unit's warranty terms. Some installers offer a maintenance plan as part of their service, worth asking about when you're comparing quotes, since a generator that isn't maintained is the most common reason one fails exactly when it's needed.

A simple homeowner-side habit

Between professional visits, periodically confirm the unit's status light isn't showing a fault, and keep the area around the generator clear of leaves, snow, or anything that could block ventilation.