9.1.12 High

Boiler Fault Code 9.1.12

Also written as 9112 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code 9.1.12 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 heat pump has stopped working because a sensor that measures the water temperature returning from your home has developed a fault. (As reported on Ideal HP290)

Pick your boiler brand for the 9.1.12 fix

Ideal 9.1.12 1 model

Source

Information for the 9.1.12 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