BoilerFaultCodes 328 High
Boiler Fault Code 328
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 328 appears across 1 boiler brand and 18 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected an issue with the quality of the electricity supply coming into your home, meaning it cannot operate safely. (As reported on Worcester Bosch CDi Classic)
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 27 April 2026