BoilerFaultCodesGledhill FLASHING P Fault Code
Also written as FLASHINGP — same fault.
The Gledhill FLASHING P fault code means: your boiler has detected that the water pressure is too low, causing it to stop running to protect the system.. It appears on 1 Gledhill model in our database.
Technical description: System pressure low
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath the boiler.Slowly open the tap or taps on the filling loop to let water into the system.Watch the pressure gauge and close the taps once the needle reaches between 1 and 1.5 bar.
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Gledhill models that show the FLASHING P fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Gledhill FLASHING 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