11/02/2026
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Your boiler should only be serviced by a Gas Safe Registered engineer.
In this case, the combustion seal has been leaking heat and products of combustion into the boiler casing area. What might look like minor deterioration is actually a serious integrity issue within the sealed combustion chamber.
When a combustion seal fails, it can lead to:
⚠️ Heat stress around internal components
⚠️ Flue gas leakage into the appliance casing
⚠️ Carbon monoxide risk
⚠️ Reduced efficiency and unsafe combustion
Carbon monoxide has no smell, no colour, and no warning signs.
A compromised seal isn’t something you’d notice — but a trained Gas Safe engineer will.
A proper service includes:
✔️ Combustion seal inspection
✔️ Integrity checks on electrodes & casing
✔️ Flue gas analysis
✔️ Manufacturer-compliant safety testing
Gas appliances are not an area to cut corners.
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