Soot or scorch marks around flue terminal or boiler casing
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
Danger: Sooting indicates unsafe combustion and potential carbon monoxide risk. Turn off the boiler immediately and do not use it.
Actions:
- Isolate power and gas to the Intergas boiler.
- Ventilate the area.
- Arrange for an urgent visit from a qualified gas technician.
The technician will need to inspect and clean the burner and heat exchanger, verify flue integrity, and perform a full combustion analysis. Components such as the burner, heat exchanger, or flue may require replacement.