Immergas
Overheating / Flue Gas Leakage
Boiler or flue emits unusual smells (burning, plastic, or flue gas 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, Flue joint leak, Overheating wiring or components, Foreign objects near flue terminal
How to Fix / Troubleshooting
Safety: If you suspect flue gas (exhaust) smell or feel unwell, turn off the boiler, ventilate the area, and contact a gas engineer immediately. Risk of carbon monoxide poisoning.
- Initial check: New or recently serviced boilers may smell as dust burns off; this should clear after a few hours of operation.
- Inspect casing and wiring (engineer): Look for discoloured or melted plastic near hot components. Replace any overheated wiring or parts.
- Flue inspection: Check all flue joints for signs of leakage (staining, corrosion). Reseat or replace flue components as necessary.
- Combustion test: A qualified engineer should perform a flue gas analysis to confirm safe operation.
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Repair Difficulty
Professional Required
5/5
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