BoilerFaultCodes P28 High
Boiler Fault Code P28
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code P28 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 get the internal water pump moving correctly when it tries to start up, which prevents the heating system from firing safely. (As reported on Alpha Pro Tec Plus)
Pick your boiler brand for the P28 fix
Source
Information for the P28 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026