FREQUENCY LOW

Gillette Low Output Frequency

Controller displays FREQUENCY LOW or HZ LOW; lights may dim when large loads start.

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.

Possible Causes

Engine underspeed due to fuel or air restriction, Governor misadjustment, Overloaded generator

How to Fix / Troubleshooting

Safety first: Reduce or disconnect loads before troubleshooting. Shut down the generator if severe frequency deviation occurs.

Steps:

Check load level: Compare connected load to the Gillette generator’s kW rating. Shed non-critical loads and see if frequency recovers.
Service fuel and air systems: Replace fuel and air filters, check for restricted exhaust, and verify fuel supply pressure.
Governor adjustment: If the engine cannot maintain speed under normal load, a governor adjustment or repair may be required. This should be done by a qualified technician.

Repair Difficulty

Medium 3/5

Required Part

Mechanical Governor Assembly

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