Thermona
Gas Leak / Incomplete Combustion
Boiler emits a strong gas smell around the appliance or flue area.
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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
Leaking gas connection at Thermona gas valve, Cracked burner seal, Loose union on gas pipework, Incorrectly set gas valve causing unburnt gas
How to Fix / Troubleshooting
Critical safety warning: If you smell gas, do not operate electrical switches, do not use naked flames, and ventilate the area immediately.
- Shut off gas: Turn off the gas supply at the emergency control valve or the isolation valve near the boiler.
- Ventilate: Open windows and doors to disperse gas.
- Evacuate if strong smell: Leave the property and call the gas emergency number or your gas supplier from outside.
- Do not relight: Do not attempt to relight or reset the Thermona boiler until a qualified gas engineer has inspected and repaired any leaks and checked combustion.
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Repair Difficulty
Professional Required
5/5
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