BoilerFaultCodes 350 High
Boiler Fault Code 350
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 350 appears across 2 boiler brands and 6 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 ability to accurately measure the temperature of the water flowing through the heating system because one of its internal sensors is sending a faulty electrical signal. (As reported on Worcester Bosch Greenstar 27CDi)
Pick your boiler brand for the 350 fix
Source
Information for the 350 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