BoilerFaultCodes 9.1.11 High
Boiler Fault Code 9.1.11
Also written as 9111 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 9.1.11 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's outdoor unit has detected a problem with the sensor that monitors the temperature of the refrigerant gas as it leaves the compressor, causing the system to stop running to prevent damage. (As reported on Ideal HP290)
Pick your boiler brand for the 9.1.11 fix
Source
Information for the 9.1.11 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