BoilerFaultCodes 376 / E4 Low
Boiler Fault Code 376 / E4
Also written as 376E4 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 376 / E4 appears across 1 boiler brand and 2 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 detecting the temperature of the water entering the system, which prevents the hot water preheat feature from working correctly. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 376 / E4 fix
Source
Information for the 376 / E4 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