Schneider Electric
Thermostat Overheating
Thermostat or wall area around it feels unusually warm to the touch.
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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
High load on internal relays, Thermostat installed on wall with hot plumbing or flue behind, Internal power supply overheating, Poor ventilation around thermostat
How to Fix / Troubleshooting
Safety: If the thermostat is hot enough to be uncomfortable to touch, turn off power at the breaker immediately.
Steps:
- Check the connected loads on the thermostat outputs; ensure they do not exceed the current ratings specified by Schneider Electric. High-current loads should be switched via external contactors.
- Inspect the wall behind the thermostat (if accessible) for hot water pipes, steam lines, or flues; relocate the thermostat if necessary.
- Ensure the thermostat is not installed in a recessed box that restricts airflow.
- If overheating persists with normal loads and installation, the internal power supply or relays may be failing; replace the thermostat.
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Repair Difficulty
Hard
4/5
Required Part
Thermostat Power Supply and Output Relays
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