Glow-worm
Overheating Electrical Component or Debris on Heat Exchanger
Boiler emits a burning smell or visible smoke from casing
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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
Dust or debris burning off heat exchanger, Overheating pump or fan motor, Failing PCB component, Plastic component overheating
How to Fix / Troubleshooting
Safety: Immediately switch off the boiler at the fused spur. If smoke is heavy or you suspect fire, evacuate and call emergency services.
- Do not restart: Do not attempt to reset or restart the boiler until it has been inspected.
- Ventilate area: Open windows to disperse any fumes.
- Engineer tasks:
- Remove the casing and inspect for signs of burning or melted components.
- Check the fan, pump, and PCB for overheating.
- Clean any debris from the heat exchanger and combustion chamber.
- Replace any damaged components and test operation safely.
Burning smells should always be investigated promptly to prevent further damage.
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Repair Difficulty
Professional Required
5/5
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