BoilerFaultCodes 20.0 High
Boiler Fault Code 20.0
Also written as 200 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 20.0 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 a failure in the ignition process, meaning it is currently unable to start up or stay lit to provide heat and hot water. (As reported on Grant Vortex)
Pick your boiler brand for the 20.0 fix
Source
Information for the 20.0 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 7 July 2026