Worcester Bosch
Combustion / Overheating / Electrical Smell Issue
Boiler or flue emits unusual smells, such as burning, metallic, or exhaust-like odours.
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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
Flue gas recirculation due to flue fault, Dust burning off heat exchanger, Overheating electrical components, Water leak onto electrics
How to Fix / Troubleshooting
Safety first: If you suspect flue gas or carbon monoxide, turn off the boiler, ventilate the area, and leave the property. Call emergency services and a Gas Safe engineer. Do not use the boiler until checked.
- Visual inspection: Look for signs of scorching, melted plastic, or water leaks around the boiler casing.
- Check flue terminal: Ensure the flue terminal is intact and not damaged or loose.
- Engineer investigation: A qualified engineer must check combustion with a flue gas analyser, inspect the flue system, and examine electrical components for overheating or water damage.
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Repair Difficulty
Professional Required
5/5
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