J12 High

Boiler Fault Code J12

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code J12 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's engine is drawing too much electrical power, causing the system to shut down to protect its internal circuits. (As reported on Ideal HP290)

Pick your boiler brand for the J12 fix

Ideal J12 1 model

Source

Information for the J12 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