Worcester Bosch
Combustion / Flue Gas Leakage Risk
Boiler or flue emits unusual smells (metallic, burning, or exhaust-like) 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
Damaged flue seals, Corroded flue, Incomplete combustion, Debris on burner or heat exchanger
How to Fix / Troubleshooting
Critical safety warning: If you smell exhaust fumes or suspect flue gas leakage, turn off the boiler immediately, ventilate the area, and do not use the appliance until checked by a Gas Safe engineer. Install and check a CO alarm.
- Visual flue check: From outside, look for damage, dislodged joints, or staining around the flue terminal.
- Do not attempt repairs: Flue and combustion components must only be serviced by a Gas Safe engineer.
- Engineer tasks: An engineer should perform combustion analysis, inspect and replace flue components or burner seals, and ensure safe operation.
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Repair Difficulty
Professional Required
5/5
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