LP Low

Boiler Fault Code LP

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code LP appears across 2 boiler brands and 13 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is currently running in a special test mode used by engineers to check performance and is not experiencing an actual hardware fault. (As reported on Biasi Rinnova Adaptive Combi)

Pick your boiler brand for the LP fix

Biasi LP 12 models Johnson Starley LP 1 model

Source

Information for the LP 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