Saunier Duval
Overheating Electrical Component or Dust Burn-off
Boiler emits a burning smell or plastic smell during operation
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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 burning off heat exchanger (new or long idle boiler), Overheating pump or fan motor, Failing PCB component, Loose electrical connection causing arcing
How to Fix / Troubleshooting
Safety first: If you smell burning plastic or see smoke, switch off power immediately and do not use the boiler.
Steps to check:
- For a new or recently serviced boiler, a slight smell may be normal for the first few hours; ensure good ventilation.
- If the smell is strong or persistent, remove the front cover (power off) and visually inspect for discoloured or melted plastic near the pump, fan, or wiring.
- Do not touch components that appear burnt; take photos and contact a heating engineer.
- Do not restore power until a professional has inspected the boiler.
Warning: Burning smells can indicate serious electrical faults and fire risk.
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Repair Difficulty
Hard
4/5
Required Part
Fan Motor / Circulation Pump / PCB
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