BoilerFaultCodesTechnical description
Problem on combustion feedback signal – gas pressure needs checking.
What causes this fault?
This fault occurs when the boiler's internal computer tries to light a flame but cannot detect a stable fire through its sensors. The most common reasons are a disruption in the gas supply to the house, a buildup of carbon on the sensing probe, or a mechanical failure of the gas valve that prevents the fuel from flowing correctly.
This issue is more frequent during very cold spells when external gas regulators can freeze or high demand on the local network causes a drop in gas pressure.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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