BoilerFaultCodes EF349 Medium
Boiler Fault Code EF349
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code EF349 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 overheating because water isn't moving through the system quickly enough, forcing it to run at its lowest power to prevent damage. (As reported on Worcester Bosch Greenstar Si Combi / i System)
Pick your boiler brand for the EF349 fix
Source
Information for the EF349 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