BoilerFaultCodes D4286 High
Boiler Fault Code D4286
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code D4286 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 shut down because it thinks the water returning to the unit is dangerously hot, which usually means water isn't circulating through your radiators properly. (As reported on Worcester Bosch GB162)
Pick your boiler brand for the D4286 fix
Source
Information for the D4286 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