FE
Protherm
Overtemperature Protection / Internal Overheat
FE error and thermostat becomes unresponsive or frequently restarts.
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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
Thermostat installed above radiator or heat source, Poor ventilation behind thermostat, Internal regulator overheating, High ambient temperature exceeding spec
How to Fix / Troubleshooting
Safety: Do not operate the thermostat with the cover removed while powered. Risk of electric shock.
- Step 1 – Check installation location:
- Ensure the thermostat is not directly above radiators, towel rails, or other heat sources.
- Move any heat-generating devices (e.g. TV, lamps) away from the thermostat.
- Step 2 – Improve ventilation:
- Ensure the back box is not completely sealed with insulation.
- Provide some airflow around the thermostat.
- Step 3 – Measure ambient temperature:
- Use a separate thermometer to check room temperature.
- If the room is within normal range but FE persists, internal components may be overheating.
- Step 4 – Relocate thermostat:
- If installation location is unsuitable, have a qualified electrician relocate the thermostat to an interior wall away from heat sources and drafts.
- Step 5 – Replace unit if internal fault:
- Persistent FE in a suitable location indicates a failing internal regulator or sensor.
- Replace the Protherm smart thermostat main unit.
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Repair Difficulty
Medium
3/5
Required Part
Protherm Thermostat Internal Temperature Sensor / Power Regulator
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