BoilerFaultCodes Wiring Harness High
Boiler Fault Code Wiring Harness
Also written as WIRINGHARNESS — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Wiring Harness 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 stopped working because of a loose connection or a fault in the internal electrical wiring between the main control board and the internal components. (As reported on Baxi 130 HE (range))
Pick your boiler brand for the Wiring Harness fix
Source
Information for the Wiring Harness 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