1505
Call a Pro
Generac · Standby Generators
RPM/frequency out-of-range event during generator operation.
Quick Answer
Error code 1505 on your Generac Standby Generators means: RPM/frequency out-of-range event during generator operation.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Stop generator and allow cooldown.
2
Check fuel supply pressure and valve state.
3
Inspect air filter condition.
4
Run no-load exercise test and monitor frequency.
5
Have technician verify governor and controller calibration.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Related Error Codes