BoilerFaultCodes 1065 B High
Boiler Fault Code 1065 B
Also written as 1065B — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 1065 B appears across 1 boiler brand and 10 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 water pressure sensor is not communicating properly with the control board, preventing the system from operating safely. (As reported on Worcester Bosch Greenstar 8000 Life/Style)
Pick your boiler brand for the 1065 B fix
Source
Information for the 1065 B 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