E20
Hyundai Power Products
High Oil Temperature / Lubrication Overheat
Controller shows E20, generator shuts down, oil temperature icon may be lit
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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
Blocked oil cooler (if fitted), Low oil level causing overheating, Faulty oil temperature sensor, Excessive engine load or poor ventilation
How to Fix / Troubleshooting
Safety first: Turn OFF the generator, disconnect battery negative, and allow engine to cool completely.
- Check oil level: Verify oil level with the dipstick and top up with the specified oil if low.
- Inspect oil cooler: If your Hyundai engine has an external oil cooler, check for blocked fins or restricted coolant flow (on water-cooled coolers). Clean debris and ensure coolant level is correct.
- Ventilation: Confirm that enclosure vents and louvers are not blocked. Remove any obstructions around the generator that could restrict airflow.
- Sensor check: Locate the oil temperature sensor and inspect its connector. If E20 appears on a cold engine, replace the sensor.
- Professional diagnosis: Persistent high oil temperature may indicate internal engine issues; contact a Hyundai service technician.
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Repair Difficulty
Hard
4/5
Required Part
Oil Temperature Sensor
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