BoilerFaultCodes 351 High
Boiler Fault Code 351
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 351 appears across 3 boiler brands and 9 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 the signal from the sensor that monitors the flow of water, meaning it has safely shut down because it cannot confirm water is moving through the system. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 351 fix
Source
Information for the 351 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