BoilerFaultCodesYour boiler has lost power to its main control board, meaning it cannot operate and you will not have any heating or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Main supply to PCB 25B.
What causes this fault?
This fault occurs when the boiler's internal computer stops receiving the steady stream of electricity it needs to function. It is usually caused by a component failure on the control board itself, a blown internal fuse, or a faulty transformer that can no longer convert power correctly. Essentially, the 'brain' of the boiler has lost its power supply and can no longer tell the other parts to turn on.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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