Pressure of 3 or greater High

Boiler Fault Code Pressure of 3 or greater

Also written as PRESSUREOF3ORGREATER — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Pressure of 3 or greater appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has too much water inside it, which is causing the safety valve to leak or trigger to protect the system from bursting. (As reported on Potterton Performa 24)

Pick your boiler brand for the Pressure of 3 or greater fix

Baxi Pressure of 3 or greater 1 model Potterton Pressure of 3 or greater 2 models

Source

Information for the Pressure of 3 or greater 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