BoilerFaultCodes D4 341 High
Boiler Fault Code D4 341
Also written as D4341 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D4 341 appears across 1 boiler brand and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is heating up much quicker than it should and is shutting down to prevent overheating, likely because the water isn't moving through the system properly. (As reported on Worcester Bosch Junior 28i)
Pick your boiler brand for the D4 341 fix
Source
Information for the D4 341 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