Medium
Pump runs on Alpha CD28

Your boiler's water pump is running constantly, which often indicates the system is failing to detect that it has successfully reached the required temperature or is struggling to circulate water properly.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description

Follow section 'B' fault finding

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

E01View →E04View →

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