Boiler Fault Code 2051 -

Also written as 2051 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code 2051 - appears across 1 boiler brand and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer has encountered a software or hardware error and can no longer control the heating and hot water correctly. (As reported on Worcester Bosch Greenstar 2000)