BoilerFaultCodesTechnical description
Flashes to indicate ignition operation (stops after detection).
What causes this fault?
This status occurs when the boiler sends an electrical spark to the burner to ignite the gas and start the heating process. If the light continues to flash without the boiler firing up, it usually means the system is struggling to sense a flame or the gas is not reaching the burner correctly. While it is often just a normal part of the startup sequence, a persistent flash suggests a component like the ignition lead or gas valve is failing.
DIY fix possible
Observe the light to see if it stops flashing and stays on (solid) or turns off once the boiler is runningCheck if the gas supply is turned on if the boiler fails to light after several attemptsPress the reset button if the light continues to flash without the boiler firing up