BoilerFaultCodes 808 / A7 Medium
Boiler Fault Code 808 / A7
Also written as 808A7 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 808 / A7 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to accurately measure the temperature of the water used for your taps and shower, which means you may experience inconsistent hot water. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 808 / A7 fix
Source
Information for the 808 / A7 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