Your boiler has stopped working because it cannot detect a flame, meaning there is likely a disruption to the gas supply or an issue with the ignition process.

No flame detected after ignition - Failure of four ignition attempts. The boiler waits 30 seconds before another attempt is made.

What causes this fault?

This fault occurs when the boiler tries to light but fails to detect a sustained flame, causing it to shut down for safety. The most common reasons include a lack of gas reaching the burner, dirty electrodes that can no longer sense the heat, or a blockage in the drainage pipe that prevents the boiler from firing correctly.