BoilerFaultCodes 340 High
Boiler Fault Code 340
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 340 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 has lost its connection to the external pump that moves water through your heating system, meaning it cannot circulate heat to your radiators or taps. (As reported on ECA FELiS FL 50 HM)
Pick your boiler brand for the 340 fix
Source
Information for the 340 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