Heatmiser Thermostat Overheating

Thermostat or surrounding wall 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

Installed above heat source, Excessive load wired directly through thermostat, Poor ventilation in back box, Internal component failure

How to Fix / Troubleshooting

Safety first: Turn off power before removing the thermostat. Overheating can be a fire risk.

Steps:

  • Check the installation location; if above a radiator or other heat source, relocate the thermostat to an internal wall away from direct heat.
  • Verify that the connected load does not exceed the thermostat's rated current; if it does, rewire via a separate relay or wiring centre.
  • Inspect the back box for adequate space and ventilation; avoid stuffing excess cable behind the thermostat.
  • If the thermostat remains hot even with minimal load, replace it as internal components may be failing.
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Repair Difficulty

Medium 3/5

Required Part

Heatmiser Smart Thermostat
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