BoilerFaultCodes J43 High
Boiler Fault Code J43
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code J43 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 internal control board has detected a communication or electrical fault with the motor that drives the system, meaning it cannot currently provide heating. (As reported on Ideal HP290)
Pick your boiler brand for the J43 fix
Source
Information for the J43 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