BoilerFaultCodes L12 High
Boiler Fault Code L12
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code L12 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 heat pump has shut down because a power component is drawing too much electricity, likely due to a blockage or a part wearing out. (As reported on Ideal HP290)
Pick your boiler brand for the L12 fix
Source
Information for the L12 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