Boiler or flue emits unusual smells (metallic, burning, or fume-like)
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 first: If you smell fumes, burning plastic, or suspect carbon monoxide, turn off the boiler immediately, ventilate the area, and do not use the boiler. If anyone feels unwell, call emergency services.
User checks:
- New boiler smell: A slight smell on first use after installation or servicing can be normal as oils burn off, but it should dissipate quickly.
- Check flue terminal: Ensure it is intact and not damaged or blocked.
Any persistent or strong smell requires immediate inspection by a Gas Safe engineer. Do not attempt to remove the case or flue components yourself.