BoilerFaultCodes 284 High
Boiler Fault Code 284
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 284 appears across 2 boiler brands and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is having trouble managing the balance of air and gas required for safe combustion and has locked itself out to prevent potential issues. (As reported on Worcester Bosch Greenstar 1000)
Pick your boiler brand for the 284 fix
Source
Information for the 284 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