Glow-worm Overheating electrical component.

Furnace smells of burning plastic or electrical burning.

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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

Overheating Glow-worm PCB, loose electrical connection causing arcing, failing fan motor, pump motor overheating.

How to Fix / Troubleshooting

Safety: Immediately switch off power at the isolator. Do not continue to operate the furnace.

User steps:

  • Leave the appliance off and allow it to cool.
  • Do not remove covers; wait for a qualified engineer.

Technician steps:

  • Inspect the PCB, fan, and pump for signs of overheating or burning.
  • Tighten any loose electrical terminals.
  • Replace any components showing heat damage and investigate the root cause (e.g., seized pump).
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Repair Difficulty

Hard 4/5

Required Part

Main Control PCB / Fan / Pump
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