BoilerFaultCodes P1.0-2.9 bar Low
Boiler Fault Code P1.0-2.9 bar
Also written as P1029BAR — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code P1.0-2.9 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 is displaying its current water pressure, which is within the normal operating range while the system is running. (As reported on Potterton Powermax HE)
Pick your boiler brand for the P1.0-2.9 bar fix
Source
Information for the P1.0-2.9 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