Common reasons why a portable generator shuts down unexpectedly

This article addresses some of the most common reasons why a portable generator may be shutting down unexpectedly. For additional portable generator, troubleshooting see Portable generator troubleshooting quick reference guide

Environment: 

This article applies to most portable generators. 

 

Initial checks

1. How many loads are plugged into the generator?

• Overloading a generator in excess of its wattage capacity can damage the generator and the connected electrical devices. Try unplugging loads and running the generator with less power applied. 

2. Is the fuel shut-off valve turned on?

• Without the fuel valve turned completely on, gas cannot get to the engine for proper function. If the fuel valve is on, check the fuel filter and fuel line for clogs. Clogged fuel lines may be restricting the amount of fuel getting to the engine. 

3. Is the oil full?

• Oil capacity is documented in the owner’s manual.  If the recommended amount is added and it still does not reach the threads on the crankcase, add enough oil to reach the bottom of the threads even if it’s more than the manual recommends. Generac generators are equipped with a low-oil shutdown system to protect the engine from low-oil damage.

4. Is the generator being directly exposed to inclement weather?

• Portable generators should not be run directly exposed to inclement weather, such as rain or snow. Avoid contact with water, whether from rain, snow, or puddles, as it can lead to operational issues or electrical hazards. Snow entering the generator's air intake can block airflow, causing the generator to shut down.

• Preventative measures include regularly clearing the area around the generator to prevent snow and debris from accumulating near the air intake and exhaust. 

Note: Generac does not recommend the use of aftermarket enclosures for any portable or home standby generator. See Can I put my home standby generator in a secondary enclosure?
 

For more information on portable generator storm preparedness and operation see How do I prepare my portable generator for a storm?