286 Medium

Boiler Fault Code 286

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 286 appears across 3 boiler brands and 4 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 from your radiators is hotter than it should be, causing the system to temporarily shut down to prevent overheating. (As reported on Worcester Bosch Greenstar CDi Compact)

Pick your boiler brand for the 286 fix

Grant 286 1 model Navien 286 1 model Worcester Bosch 286 2 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 31 August 2026