RV generator won't start

Symptoms

• Generator does nothing when the start switch is pressed
• Generator cranks but won't start
• Generator ran fine before but hasn't been used in a while

Likely causes

• CommonLow oil level triggering an automatic safety shutdownMost RV generators have a low-oil safety feature that prevents starting entirely if oil is low.
• CommonOld or stale fuel, especially after storageFuel sitting for months can degrade and prevent reliable starting, similar to other small engines.
• CommonLow battery powering the generator's start circuitGenerators often use their own or the house battery to start, and a weak battery prevents cranking.
• PossibleTripped breaker or blown fuse on the generator's control circuitA safety breaker can trip and simply needs to be reset before the generator will respond.

What to do

1. Check the generator's oil level first, since low oil is a very common reason it won't even attempt to start.
2. Check the fuel level and, if it's been sitting for months, consider that stale fuel may be the cause, especially on gasoline-powered generators.
3. Check the battery used to start the generator (sometimes the house battery, sometimes a separate one) and charge or jump it if weak.
4. Look for a generator-specific breaker or fuse, often at the generator itself or a control panel, and reset if tripped.
5. If it's a propane-fueled generator, confirm the propane tank has fuel and the valve is open.
6. If oil, fuel, and battery are all fine but it still won't crank or start, have an RV or generator technician diagnose it further.

Tools and parts

• Basic hand tools

When to call a pro

If basic checks don't resolve it, have a generator technician diagnose the starter, ignition, or carburetor.

Safety