Fault 14 / 117 Medium
Boiler Fault Code Fault 14 / 117
Also written as FAULT14117 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fault 14 / 117 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 having trouble communicating with an external control or thermostat that isn't compatible with it. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the Fault 14 / 117 fix
Source
Information for the Fault 14 / 117 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