BoilerFaultCodes P1, P2, P3 Low
Boiler Fault Code P1, P2, P3
Also written as P1P2P3 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code P1, P2, P3 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is currently just running a quick internal startup routine, so please leave it alone for a few moments to see if it clears itself. (As reported on Worcester Bosch Greenstar 25i (ZWB 7-25))
Pick your boiler brand for the P1, P2, P3 fix
Source
Information for the P1, P2, P3 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 27 April 2026