BoilerFaultCodesYour boiler has lost power because of an electrical issue or a blown fuse inside the control unit.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Fault with mains supply or PCB fuse
What causes this fault?
This fault occurs when the boiler's internal computer loses electrical power, preventing the system from starting up at all. The most common reason is a blown fuse on the circuit board, which often happens due to an unexpected power surge or a failing internal component causing an electrical short.
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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