Your boiler has detected a safety issue and has shut down to protect your home, which means you currently have no heating or hot water until it is reset or repaired.

Lockout fault (Reset required)

What causes this fault?

This fault occurs when the boiler fails to light or loses its flame three times in a row, causing it to stop for safety reasons. The most common reasons include a lack of gas supply, a build-up of carbon on the ignition probe, or a component failure that prevents the burner from firing up correctly.