65 + High

Boiler Fault Code 65 +

Also written as 65 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 65 + appears across 2 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to manage the flame correctly and has shut down as a safety precaution because it cannot maintain a stable burn. (As reported on Biasi Antares Combi)

Pick your boiler brand for the 65 + fix

Biasi 65 + 4 models Worcester Bosch 65 + 1 model

Source

Information for the 65 + 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