BoilerFaultCodes 522 Low
Boiler Fault Code 522
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 522 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is currently performing a routine self-check of its temperature sensors to ensure it is operating safely and accurately. (As reported on Worcester Bosch 1000)
Pick your boiler brand for the 522 fix
Source
Information for the 522 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