Generac Generator Error Code 1515: How to Fix It

Q: Can I continue using the generator with error 1515?

No. Over speed protection means the engine is running too fast, which can cause catastrophic engine failure, overheating, or damage to the alternator. Stop the generator immediately and troubleshoot.

Q: What causes error 1515 on a Generac generator?

Common causes include a faulty throttle actuator (stepper motor), a stuck or binding governor linkage, a failed speed sensor, or a defective control board.

Q: How do I reset error code 1515?

After fixing the underlying issue, you can reset the error by turning the generator OFF, waiting 30 seconds, and restarting. If the problem is resolved, the code will clear. If not, it will reappear.

Q: Can a low oil level cause error 1515?

No, low oil typically triggers a different code (e.g., 1503). Error 1515 is specifically for over speed conditions, not oil issues. However, always check oil level as part of general maintenance.

Q: Do I need to replace the entire control board for error 1515?

Not necessarily. Often the throttle actuator or speed sensor is the culprit. Only replace the control board if all other components test good and the error persists.

Abstract

Error code 1515 on your Generac generator indicates over speed protection has been triggered. This means the engine is running faster than its safe maximum RPM, usually due to a malfunctioning governor, faulty throttle actuator, or a problem with the speed sensor. Continuing to run the generator under over speed conditions can cause severe engine damage, so immediate troubleshooting is required.