BoilerFaultCodes Low system pressure neon lit High
Boiler Fault Code Low system pressure neon lit
Also written as LOWSYSTEMPRESSURENEONLIT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Low system pressure neon lit appears across 1 boiler brand and 1 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 central heating system to operate safely, so it has shut down to protect itself. (As reported on Ideal Classic FF)
Pick your boiler brand for the Low system pressure neon lit fix
Source
Information for the Low system pressure neon lit 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