BoilerFaultCodes AL 14 High
Boiler Fault Code AL 14
Also written as AL14 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AL 14 appears across 1 boiler brand and 19 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected an issue with the sensor that monitors the heat of the gases leaving your system, which prevents the boiler from running to keep it safe. (As reported on Sime iQE Comfort 30)
Pick your boiler brand for the AL 14 fix
Source
Information for the AL 14 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 7 July 2026