BoilerFaultCodes P3.0-3.5 bar High
Boiler Fault Code P3.0-3.5 bar
Also written as P3035BAR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code P3.0-3.5 bar 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 has shut down because there is too much water pressure in the system, which could lead to leaks if not addressed. (As reported on Potterton Powermax HE)
Pick your boiler brand for the P3.0-3.5 bar fix
Source
Information for the P3.0-3.5 bar 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