Immergas
Abnormal Thermostat Heating
Thermostat plastic housing is warm or hot to the touch during normal 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
Installed above warm pipe or chimney, Internal power component overheating, Excessive backbox insulation blocking airflow, Incorrect supply voltage
How to Fix / Troubleshooting
Safety: Turn off power before removing the thermostat from the wall.
- Step 1 – Check surroundings: Ensure no hot water pipes or flues run directly behind the thermostat location.
- Step 2 – Inspect backbox: Remove the thermostat and check the wall box for insulation or foam blocking airflow. Remove obstructions.
- Step 3 – Verify voltage: Have a qualified person measure the supply voltage to the thermostat and confirm it matches the specified range.
- Step 4 – Replace thermostat: If the unit remains abnormally hot with correct installation and voltage, internal components may be failing; replace the thermostat.
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Repair Difficulty
Medium
3/5
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