High Lockout
E15v on Main Eco Compact

Your boiler has detected an internal issue with the gas control system and has shut down as a safety precaution.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

Gas valve error

What causes this 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 is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →

Related fault codes

E110View →

Related guides you might find useful

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →

Pilot light keeps going out

Older boilers — thermocouple, draught, gas supply.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →