9.1.5 High

Boiler Fault Code 9.1.5

Also written as 915 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 9.1.5 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 system has a faulty temperature sensor in the main pipework, which means it cannot accurately monitor the water heat flowing through your home. (As reported on Ideal HP290)

Pick your boiler brand for the 9.1.5 fix

Ideal 9.1.5 1 model

Source

Information for the 9.1.5 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