BoilerFaultCodes 354 High
Boiler Fault Code 354
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 354 appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning The boiler's digital memory has lost the settings that tell it how much pressure it should maintain, causing it to stop working for safety reasons. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 354 fix
Source
Information for the 354 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