BoilerFaultCodes NO CODE 212 High
Boiler Fault Code NO CODE 212
Also written as NOCODE212 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code NO CODE 212 appears across 1 boiler brand and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is shutting down because it is heating up much faster than it should, usually due to water not flowing through the system properly. (As reported on Worcester Bosch Greenstar Si Combi / i System)
Pick your boiler brand for the NO CODE 212 fix
Source
Information for the NO CODE 212 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