BoilerFaultCodes 728 Low
Boiler Fault Code 728
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 728 appears across 1 boiler brand 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 displaying its specific model identification code, which is an internal manufacturer setting rather than a functional fault or error. (As reported on Grant Vortex Eco)
Pick your boiler brand for the 728 fix
Source
Information for the 728 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