9.1.35 High

Boiler Fault Code 9.1.35

Also written as 9135 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 9.1.35 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is unable to switch between heating your house and providing hot water because an internal diverter component is stuck or broken. (As reported on Ideal HP290)

Pick your boiler brand for the 9.1.35 fix

Ideal 9.1.35 1 model

Source

Information for the 9.1.35 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