BoilerFaultCodesGledhill P Fault Code
The Gledhill P fault code means: your boiler has detected that the water pressure in the system is too low to run safely and has stopped working to protect itself.. It appears on 1 Gledhill model in our database.
Technical description: Flashing 'P' indicates low system pressure.
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Slowly open the valve or valves on the filling loop until you hear water flowing.Watch the pressure gauge and close the valves tightly once the needle reaches between 1.0 and 1.5 bar.
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Gledhill models that show the P fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Gledhill P fault code information on this page is sourced and cross-checked against the official Gledhill service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026