BoilerFaultCodes Loss of system water pressure High
Boiler Fault Code Loss of system water pressure
Also written as LOSSOFSYSTEMWATERPRESSURE — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Loss of system water pressure appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your heating system is losing water, which means there is likely a leak or a failing pressure relief valve causing the boiler to stop working correctly. (As reported on Ideal Mexico Super CF3 40-80)
Pick your boiler brand for the Loss of system water pressure fix
Source
Information for the Loss of system 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 27 April 2026