Safety: Turn off power at the breaker before inspecting the thermostat or wiring. Overheated components can cause burns.

Steps to address overheating:

1. Measure load: Add up the wattage of all Stelpro heaters controlled by the thermostat and compare with the thermostat's maximum rating. Reduce load if near or above the limit.
2. Inspect terminals: With power OFF, remove the thermostat and check that all terminal screws are tight and that there is no discoloration or melting around the terminals.
3. Check wall box size: Ensure the thermostat is installed in an approved electrical box with adequate space for wiring and airflow.
4. Monitor temperature: After correcting any issues, restore power and monitor the thermostat temperature during operation. It should be warm but not hot.
5. Replace thermostat: If overheating persists or you see signs of internal damage, replace the thermostat and consider using a remote relay for high loads.

Warning: Persistent overheating is a fire risk. Do not ignore this symptom.

Thermostat or wall around it feels unusually warm to the touch

Possible Causes