E20
Termet
Frost Protection / Low Temperature Fault
Display shows E20, heater may shut down when water temperature is near freezing or in very cold conditions.
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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 frost protection sensor on Termet heater, No power to unit during freezing conditions, Blocked circulation preventing frost protection, Faulty PCB frost logic
How to Fix / Troubleshooting
Safety: Protect the heater from freezing damage. If the unit is frozen, do not force operation.
- Restore power: Ensure the heater has electrical power so that frost protection can operate.
- Check location: If installed in an unheated space, improve insulation and protect pipes from freezing.
- Sensor check: Inspect and test the frost protection / ambient NTC sensor. Replace if readings are incorrect.
- Thawing: If pipes are frozen, gently thaw using warm air (not open flame). Check for leaks once thawed.
- Technician: If E20 persists in non-freezing conditions, a Termet technician should test the sensor and PCB.
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Repair Difficulty
Medium
3/5
Required Part
Frost Protection NTC Sensor
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