BoilerFaultCodesMain E15v Fault Code
Also written as E15V — same fault.
The Main E15v fault code means: your boiler has detected an internal issue with the gas control system and has shut down as a safety precaution.. It appears on 1 Main model in our database.
Technical description: Gas valve error
What causes the Main E15v fault?
This fault occurs when the boiler's control board sends a signal to the gas valve to open or close, but it does not receive the expected electrical feedback. It is usually caused by a mechanical failure within the valve itself or a communication breakdown on the main circuit board. Because the boiler cannot confirm it can safely control the flow of gas, it shuts down immediately to ensure your safety.
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 →Main models that show the E15v fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Main E15v fault code information on this page is sourced and cross-checked against the official Main service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026