Danfoss Ally Overheating Electronics / Localized Overtemperature

Thermostat or radiator valve area is warm to the touch and there is a faint smell of hot plastic.

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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

Thermostat installed directly on very hot valve body, Internal component overheating, Poor ventilation around thermostat, Overvoltage or wiring fault in mains unit

How to Fix / Troubleshooting

Safety first: If you smell burning plastic or see smoke, immediately switch off power at the main breaker and do not use the device.

Steps:

  • Inspect visually: After power is off and the unit has cooled, remove the thermostat and check for discoloration or melted plastic.
  • Check installation: Ensure the thermostat is not exposed to temperatures beyond its rating (e.g. on very high‑temperature flow pipes).
  • Do not reuse damaged units: If any signs of overheating are present, replace the thermostat and correct any wiring or installation issues.
  • Consult professional: For mains‑powered units with signs of overheating, have a qualified electrician or heating engineer inspect the circuit.
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Repair Difficulty

Hard 4/5

Required Part

Danfoss Ally Thermostat
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