Boiler Fault Code Pump circulating water / No

Also written as PUMPCIRCULATINGWATERNO — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code Pump circulating water / No appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to push water around your radiators and taps, likely because there is trapped air in the system or the internal water pump has become faulty. (As reported on Alpha CB 240 / 280)