Heatit Room Sensor Underreading

Thermostat shows much lower room temperature than actual

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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

Cold drafts behind thermostat, Sensor on external wall, Internal sensor damage, External sensor near door or window

How to Fix / Troubleshooting

Safety first: Turn OFF power at the breaker before removing the thermostat.

Steps to troubleshoot:

  • 1. Seal wall box drafts:
    • Check for cold air entering the wall box from cavities.
    • Seal gaps with non-flammable insulation (not blocking ventilation directly behind sensor).
  • 2. Relocate sensor:
    • Move external room sensor away from drafts and external walls.
  • 3. Use temperature offset:
    • Some Heatit models allow a calibration offset; adjust to match actual temperature.
  • 4. Replace sensor if faulty:
    • If readings are unstable or far off, replace the thermostat or external sensor.
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Repair Difficulty

Medium 3/5

Required Part

Heatit Internal Room Sensor or External Room Sensor
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