BoilerFaultCodesTechnical description
Interruption Of Power Supply while in fault mode
What causes this fault?
This fault occurs when the boiler loses electrical power—either due to a local power cut or someone switching off the fused spur—while it was already struggling with a different internal issue. Because the boiler was interrupted while trying to process an existing error, it enters a protective 'lockout' state to prevent you from accidentally running the system in an unsafe condition. It effectively gets stuck in a loop between the old error and the sudden loss of power.
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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