Your boiler is taking longer than usual to light, though it is still currently working.

Average ignition times

What causes this fault?

This issue occurs when the boiler's control board detects that the burner is taking a few seconds longer than normal to establish a stable flame. The most common reasons are worn-out spark electrodes that can no longer create a strong spark or a build-up of carbon deposits on the sensing probe which prevents it from 'seeing' the flame quickly.