Low water pressure High

Boiler Fault Code Low water pressure

Also written as LOWWATERPRESSURE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Low water pressure appears across 7 boiler brands and 27 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that there is not enough water in the system to operate safely, which is usually caused by a small leak or air being bled from radiators. (As reported on Ideal Concorde)

Pick your boiler brand for the Low water pressure fix

Ferroli Low water pressure 2 models Glow-worm Low water pressure 1 model Heatline Low water pressure 2 models Ideal Low water pressure 15 models Johnson Starley Low water pressure 1 model Keston Low water pressure 5 models Vokera Low water pressure 1 model

Source

Information for the Low water pressure 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 7 July 2026