20, 21, 22, 23, 24 Unknown

Boiler Fault Code 20, 21, 22, 23, 24

Also written as 2021222324 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 20, 21, 22, 23, 24 appears across 2 boiler brands and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Pick your boiler brand for the 20, 21, 22, 23, 24 fix

Atmos 20, 21, 22, 23, 24 1 model Intergas 20, 21, 22, 23, 24 2 models

Source

Information for the 20, 21, 22, 23, 24 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 31 August 2026