BoilerFaultCodes 20/21/22 High
Boiler Fault Code 20/21/22
Also written as 202122 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 20/21/22 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 has detected that it is running much hotter than it should be and has switched itself off to prevent overheating. (As reported on Vokera Linea HE)
Pick your boiler brand for the 20/21/22 fix
Source
Information for the 20/21/22 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