CTC
Overheating Electrical Component
Boiler emits a burning smell or plastic odour 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 installation), Overheating pump or fan motor, Loose electrical connection causing arcing, Blocked ventilation around boiler casing
How to Fix / Troubleshooting
Safety: If you smell burning plastic or see smoke, switch off power immediately and do not use the boiler until inspected.
- New boiler check: A slight smell during first hours of operation can be normal as protective oils burn off. This should dissipate quickly.
- Inspect ventilation: Ensure the CTC boiler has adequate clearance and that ventilation grilles are not blocked.
- Internal inspection (technician): Remove the front cover and look for discoloured wiring, scorched PCB areas, or overheated motors. Tighten any loose terminals.
- Replace damaged components: Any component showing signs of overheating should be replaced before returning the boiler to service.
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Repair Difficulty
Hard
4/5
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