Read the manual thoroughly and understand all of the instructions, cautions, and warnings before using this equipment. If any section of the manual is not understood, contact your nearest authorized dealer, or contact Generac Customer Service at 1-888-436-3722 (1-888-GENERAC), or www.generac.com with any questions or concerns.

Engine cranks but will not start or runs rough

This article covers the most common issues but is not exhaustive. If these steps do not identify or resolve the issue, generator owners should reach out to a local authorized service dealer. See the How Can I Find a Generac Service Dealer in My Area? article for more information.

Environment

This article generally applies to Generac home standby generators.

Troubleshooting

1. What does the control panel say?

• Check for E-codes/alarms. See the How Do I Clear an Error or Alarm Code On My Home Standby Generator? article for more information.

Note: If your generator model does not feature an LCD display, use either the Field Pro mobile app (for compatible controllers) or consult your generator's user manual to diagnose error indicators.

2. Was the unit recently installed?

Note: These steps should be performed by an IASD.

• Ensure fuel is turned on. A shutoff valve should be within 6 ft of the unit.
• Verify fuel lines have been bled. Air pockets in the line will prevent the unit from starting. This is especially common if LP was recently refilled.
• Check for an empty or low LP tank.
• Verify proper fuel conversion if running on LP.

3. Is this an existing install? When was maintenance last completed?

• If running on LP, check for an empty or low tank.
• Verify appropriate maintenance is complete.
• Check the air filter. See the How Do I Check and Change the Air Filter On My Home Standby Generator? article for more information.
• Check spark plugs. See the How Do I Service the Spark Plugs in a Generac Air-Cooled Home Standby Generator? for more information.
• Check and change the oil and filter if necessary. See the How Do I Change the Oil and Oil Filter in a Generac Air-Cooled Home Standby Generator? article for more information.
• Ensure valve adjustments have been done at proper intervals. Valve adjustment procedures can be found in the generator's user manual. See the How Do I Find a Copy of My Home Standby Generator Owner's Manual and Spec Sheets? for more information.

To schedule an inspection or service call, contact your local Generac authorized service dealer. See the Where Can I Find a Generac Dealer in the U.S. Or Canada? article for more information.