46.0 High

Boiler Fault Code 46.0

Also written as 460 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 46.0 appears across 1 boiler brand and 1 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 that the water flow through the heating system is too low or blocked, preventing it from heating your home safely. (As reported on Grant Vortex)

Pick your boiler brand for the 46.0 fix

Grant 46.0 1 model

Source

Information for the 46.0 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