Danfoss Overheating / Electrical Damage

Thermostat or wiring centre has a noticeable burning smell or visible scorch marks.

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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

Overloaded relay contacts, Loose terminal causing arcing, Incorrect wiring of mains to low-voltage terminals, Internal component failure

How to Fix / Troubleshooting

Safety first: Immediately switch off power at the main breaker. Do not continue using any device that smells of burning or shows scorch marks.

Steps to diagnose and fix:

  • 1. Inspect externally: Without opening the device, look for discolouration, melted plastic, or smoke residue.
  • 2. Remove cover (power OFF): If competent, open the thermostat or wiring centre to locate the damaged area. Do not touch burnt components.
  • 3. Identify cause: Check for loose wires, signs of over-tightened or under-tightened terminals, and verify that mains and low-voltage circuits are correctly separated.
  • 4. Replace damaged unit: Do not attempt to repair burnt PCBs or melted housings. Replace the thermostat or wiring centre with a new Danfoss unit.
  • 5. Correct wiring: Before powering up the new unit, ensure all wiring is corrected and tightened to manufacturer torque specifications.

When to call a professional: Any overheating or burning smell should be investigated by a qualified electrician or heating engineer.

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Repair Difficulty

Professional Required 5/5

Required Part

Thermostat Housing / Wiring Centre PCB
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