Overfrequency
Honeywell
Output frequency above nominal (e.g., above 61 Hz on a 60 Hz system)
Controller displays 'Overfrequency' or 'High Hz'; generator may disconnect from load.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Governor misadjustment, Sticking throttle in high-speed position, Faulty frequency sensing or controller, Incorrect governor spring installation
How to Fix / Troubleshooting
Safety first: Isolate the generator from the load and turn it OFF. Disconnect battery negative before adjusting mechanical components.
Steps:
- Inspect throttle and governor: Check that the throttle plate returns to idle when the engine is off. Clean any carbon buildup and lubricate pivot points lightly.
- Check governor springs: Ensure the correct springs are installed and not stretched or incorrectly hooked.
- Controller reset: Clear the Overfrequency alarm and run a test. If frequency remains high, the governor may need adjustment.
- Professional adjustment: Because overspeed can damage the alternator and engine, have a qualified technician adjust the governor and verify frequency with a calibrated meter.
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Repair Difficulty
Hard
4/5
Required Part
Governor Assembly
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