BoilerFaultCodes 328 High
Boiler Fault Code 328
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 328 appears across 2 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's computer is struggling to get a steady power supply from your home's electricity, causing it to stop work to protect its internal parts. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the 328 fix
Source
Information for the 328 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