BoilerFaultCodesYour boiler has stopped working because the internal pump, which moves hot water around your pipes and radiators, is either jammed or has suffered an electrical failure.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Pump error (stuck or there is an electrical pump fault)
What causes this fault?
This fault occurs when the pump responsible for moving water through your heating system fails to spin or communicate with the main control board. The most common cause is internal debris or 'sludge' from the radiators jamming the pump's moving parts, though it can also be triggered by a failure in the motor's electrical components. As the water cannot circulate, the boiler shuts down to prevent itself from overheating.
This issue often surfaces in autumn when the heating is turned on for the first time after summer, as the pump can seize up if it hasn't moved for several months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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