SENSOR FAILURE
Guardian
Analog Sensor Input Fault
Controller displays SENSOR FAILURE or GENERIC SENSOR FAULT; may prevent start or cause shutdown.
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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, Failed oil temperature sensor, Open or shorted sensor wiring, Defective controller analog input
How to Fix / Troubleshooting
Safety first: Place the controller in OFF and open the main breaker. Allow the engine to cool before touching sensors.
- Identify sensor: Use the Guardian manual or controller sub-menu to determine which sensor is reporting failure.
- Inspect connector: Locate the sensor on the engine and check that the connector is fully seated and free of corrosion.
- Check wiring harness: Follow the harness back to the controller, looking for chafed or broken wires. Repair as needed.
- Replace sensor: If wiring is intact, replace the suspect sensor with a Guardian-approved part.
- Controller test: If a new sensor does not clear the fault, the controller input circuit may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Coolant Temperature Sensor
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