Boiler Fault Code 375 699

Also written as 375699 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code 375 699 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 detected that the internal safety valve meant to release excess pressure has been triggered, which often causes water to leak or drip from the pipe outside your home. (As reported on Worcester Bosch 24i RSF)