Boiler emits a burning smell or plastic smell when running, possibly with slight smoke from casing vents.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Immediately switch off power at the fused spur. Do not continue to operate the boiler if you smell burning or see smoke.
Homeowner checks:
- Visually inspect around the boiler for any external source of burning smell (e.g., nearby items touching the flue or casing).
- Do not remove the case; wait for an engineer.
Engineer actions:
- Remove the case and inspect the PCB, wiring, and pump for signs of overheating or burning.
- Tighten any loose terminals and replace damaged wiring.
- Replace the Worcester PCB or pump if heat damage is evident.
Operating a boiler with overheating electrical components is a fire risk and must be addressed urgently.
Repair Difficulty
Required Part
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