Low Coolant Temperature
Kohler
Coolant Temperature Below Minimum for Load Acceptance
Controller displays “Low Coolant Temp” on liquid-cooled models; may inhibit automatic transfer under 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
Block heater not functioning, Ambient temperature very low, Faulty coolant temperature sensor, Thermostat stuck open
How to Fix / Troubleshooting
Safety first: Turn generator OFF and open main breaker.
- Verify heater power: Ensure the block heater circuit is energized and that any GFCI or breaker feeding it is not tripped.
- Check heater operation: After being powered for an hour, hoses near the heater should be warm. Replace the heater if cold.
- Sensor check: Inspect the coolant temperature sensor and wiring for corrosion or damage. Replace sensor if readings are clearly incorrect compared to actual engine temperature.
In very cold climates, consider additional enclosure heating or insulation as recommended by Kohler.
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Repair Difficulty
Medium
3/5
Required Part
Coolant Temperature Sensor
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