BoilerFaultCodes 5.0 Low
Boiler Fault Code 5.0
Also written as 50 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 5.0 appears across 1 boiler brand and 5 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 set to run at its maximum heating capacity, which is typical during a start-up or testing cycle rather than a permanent fault. (As reported on Worcester Bosch ZB 7 27 HE)
Pick your boiler brand for the 5.0 fix
Source
Information for the 5.0 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 27 April 2026