Heatit
Stuck Relay/Triac or Sensor Misreading
Thermostat heats continuously and does not turn off even when setpoint is reached
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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
Welded relay contacts, Shorted triac, Faulty floor or room sensor reading too low, Incorrect sensor type configured
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker immediately to prevent overheating of the floor or heater.
Steps to troubleshoot:
- 1. Confirm symptom:
- Set the thermostat to a very low setpoint (e.g. 5°C) and observe if the heating indicator and load remain on.
- 2. Check sensor readings:
- Compare displayed room/floor temperature with an external thermometer.
- If the thermostat reads much lower than actual, the sensor may be faulty or misconfigured.
- 3. Inspect output stage:
- With power OFF, disconnect the load wires.
- With power ON and no heat demand, measure if voltage is still present at the load terminals; if yes, the relay/triac is stuck.
- 4. Replace faulty components:
- If sensor is faulty, replace the Heatit NTC sensor.
- If the output is stuck, replace the entire thermostat; internal power components are not serviceable.
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Repair Difficulty
Hard
4/5
Required Part
Heatit Thermostat or Heatit NTC Sensor
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