BoilerFaultCodesWorcester Bosch 375 699 Fault Code
Also written as 375699 — same fault.
The Worcester Bosch 375 699 fault code means: 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.. It appears on 1 Worcester Bosch model in our database.
Technical description: Pressure Relief Valve
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 375 699: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Worcester Bosch models that show the 375 699 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch 375 699 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026