Coolant Temperature Sensor Fault
Honeywell
Faulty or open/shorted coolant temperature sensor circuit
Liquid-cooled unit shows 'Coolant Temp Sensor Fault' or erratic temperature readings.
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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
Failed coolant temperature sensor, Broken sensor wiring, Corroded connector at sensor, Controller input fault
How to Fix / Troubleshooting
Safety first: Turn OFF the generator and allow it to cool. Disconnect battery negative before unplugging sensors.
Steps:
- Locate sensor: Find the coolant temperature sensor threaded into the engine or coolant passage.
- Inspect connector: Disconnect and inspect for corrosion, bent pins, or moisture. Clean and apply dielectric grease, then reconnect.
- Wiring check: Follow the harness back to the controller, looking for chafed or broken wires.
- Sensor replacement: If wiring is intact and the fault persists, replace the sensor with the correct Honeywell/engine OEM part.
- Clear fault: Reconnect battery, clear the alarm, and verify normal temperature readings during a test run.
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Repair Difficulty
Medium
3/5
Required Part
Coolant Temperature Sensor
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