BoilerFaultCodes P3.0-3.5 High
Boiler Fault Code P3.0-3.5
Also written as P3035 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code P3.0-3.5 appears across 1 boiler brand and 1 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 central heating system. (As reported on Potterton Powermax HE)
Pick your boiler brand for the P3.0-3.5 fix
Source
Information for the P3.0-3.5 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