Vokera
Combustion / Overheating Smell
Boiler or flue emits unusual smells (burning, metallic, or exhaust-like odour)
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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, Flue gas recirculation due to flue fault, Overheating components, Small water leak onto hot parts
How to Fix / Troubleshooting
Safety first: If you smell gas or strong exhaust fumes, turn off the boiler, open windows, evacuate if necessary, and call the gas emergency number. Do not use naked flames or switches.
- Initial use smell: A slight burning smell on first use after installation or long downtime can be normal as dust burns off; it should dissipate quickly.
- Check for visible leaks: Look for water dripping onto hot components.
- Engineer tasks:
- Inspect flue for leaks or recirculation.
- Check for overheating marks on wiring and components.
- Perform combustion analysis.
Any persistent or strong smell must be investigated by a Gas Safe engineer.
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Repair Difficulty
Professional Required
5/5
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