BoilerFaultCodes 5-A2 Medium
Boiler Fault Code 5-A2
Also written as 5A2 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 5-A2 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 hot water temperature has exceeded its maximum safe limit and has shut down as a precaution. (As reported on Worcester Bosch Greenstar 2000)
Pick your boiler brand for the 5-A2 fix
Source
Information for the 5-A2 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