BoilerFaultCodes A47 High
Boiler Fault Code A47
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code A47 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's water pressure sensor is providing an incorrect reading, which is preventing the system from heating your water correctly. (As reported on Ferroli Optimax HE Plus)
Pick your boiler brand for the A47 fix
Source
Information for the A47 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