E20
Lifan
Oil Temperature / Oil Level Sensor Fault (advanced models)
Controller displays E20 and the generator refuses to run continuously.
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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
Faulty oil temperature sensor, Defective oil level sensor in sump, Damaged wiring harness to oil sensors, Incorrect sensor type installed
How to Fix / Troubleshooting
Safety first: Turn OFF the generator, disconnect battery negative, and allow the engine to cool. Verify oil level before running.
- Check oil level: Confirm the oil level is correct on the dipstick. Top up with the specified oil if low.
- Inspect oil sensors: Some Lifan engines use a combined oil level/temperature sensor in the sump. Inspect the connector and wiring for damage or oil contamination.
- Test sensor: Remove the sensor and measure resistance at room temperature, then in warm oil, comparing to Lifan specs. Replace the oil level/temperature sensor if readings are incorrect.
- Harness continuity: Check continuity from the sensor connector to the controller input pins. Repair any open or shorted wires.
- Reset and test: After replacement, clear E20 and run the generator while monitoring for further alarms.
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Repair Difficulty
Medium
3/5
Required Part
Oil Level/Temperature Sensor
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