BoilerFaultCodesTechnical description
Final fault code (Refer to section 7.11)
What causes this fault?
This fault occurs when the boiler's internal computer has tried multiple times to resolve a previous error but has failed to do so safely. It acts as a safety shutdown to prevent damage, usually triggered by a persistent issue with the ignition process or the fuel delivery system. Because the boiler cannot confirm it is firing correctly after several attempts, it enters a hard lock to protect the household.
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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