286 Medium

Boiler Fault Code 286

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 286 appears across 3 boiler brands and 11 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 the water returning to it from your radiators is hotter than it should be, suggesting a potential issue with how your heating system is circulating water. (As reported on Worcester Bosch 24/28/35 CDi MkII)

Pick your boiler brand for the 286 fix

Grant 286 6 models Navien 286 1 model Worcester Bosch 286 4 models

Source

Information for the 286 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