BoilerFaultCodesTechnical 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 is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.