BoilerFaultCodesYour boiler has developed an internal electrical fault that is preventing it from restarting even after you try to reset it.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Selector switch or PCB failure (Section K)
What causes this fault?
This fault occurs when the boiler's internal computer or the main control dial fails to communicate correctly, meaning the system cannot clear its memory of a previous error. The most common reason is that the circuits on the main control board have worn out or shorted, preventing the reset signal from reaching the burner.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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