E18
Westinghouse
Sensor Input Fault (Generic Analog Sensor Error)
Generator runs but controller shows E18 and may limit operation
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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 temperature, pressure, or level sensor, shorted sensor wiring, incorrect sensor type installed
How to Fix / Troubleshooting
Safety first: Turn the controller to OFF, open the main AC breaker, and disconnect the negative battery cable.
- Identify which sensor: Refer to the Westinghouse service manual or controller sub-menu to determine which analog sensor is reporting E18 (e.g., coolant temp, oil temp, fuel level).
- Inspect sensor and wiring: Locate the sensor on the engine or tank. Check the connector for corrosion, bent pins, or loose fit. Inspect the harness for chafing or pinched sections.
- Test sensor resistance: Using the manual's specifications, measure sensor resistance at ambient temperature. Replace the sensor if readings are out of range or open/shorted.
- Clear code and retest: After replacement, reconnect the battery, clear E18, and run the generator to confirm normal readings.
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Repair Difficulty
Medium
3/5
Required Part
Coolant Temperature Sensor
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