Boiler emits a burning smell or plastic odour during operation, sometimes 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 warning: If you see smoke or suspect an electrical fire, switch off power at the mains immediately and do not use the boiler.
User checks:
- For a new boiler, a slight smell during the first hours of operation can be normal as protective oils burn off; this should dissipate quickly.
- If the smell is strong, persistent, or accompanied by visible smoke, turn off the boiler and call a technician.
Technician checks:
- Inspect the PCB, pump, and fan for signs of overheating or melted insulation.
- Tighten any loose electrical connections and replace damaged wiring.
- Replace any components showing heat damage.
Do not continue operating the boiler until the source of the smell is identified and rectified.
Repair Difficulty
Required Part
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