Heatit
Overheating of Thermostat Housing
Thermostat or wall box feels unusually warm to the touch during 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
High load near maximum rating, Poor ventilation in wall box, Loose terminal causing resistive heating, Installed in insulated or airtight box
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker before opening the wall box. Overheating can be a fire risk.
Steps to troubleshoot:
- 1. Measure load current:
- Calculate or measure the current drawn by the connected heating system.
- Ensure it does not exceed the thermostat's rated current.
- 2. Inspect terminals:
- Check for discoloration or melted insulation at L, N, and load terminals.
- Tighten all screws firmly.
- 3. Improve ventilation:
- Ensure the wall box is not completely sealed with insulation.
- Consider using a deeper box or relocating the thermostat.
- 4. Use external relay for high loads:
- For loads near the maximum rating, use a Heatit relay or contactor controlled by the thermostat.
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Repair Difficulty
Hard
4/5
Required Part
Heatit Thermostat and Wall Box Wiring
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