BoilerFaultCodes 329 High
Boiler Fault Code 329
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 329 appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to detect water movement because the system pressure may be too low or the pump is failing to circulate water correctly. (As reported on Worcester Bosch Greenstar 28CDi)
Pick your boiler brand for the 329 fix
Source
Information for the 329 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 7 July 2026