BoilerFaultCodesTechnical description
Control button not held down long enough.
What causes this fault?
This fault happens because the manual gas valve was not given enough time to establish a stable pilot flame before the button was released. When you press the ignition button, it physically pushes gas through to the pilot light, but it takes a few moments for the safety sensor to get hot enough to hold the gas valve open. If you let go too soon, the safety mechanism assumes the flame hasn't caught and immediately cuts the gas supply as a precaution.
This is more common during the first cold spell of autumn when homeowners are relighting their boilers for the first time after the summer break.
DIY fix possible
Locate the grey gas control button on the front of the unit.Press and hold the button down firmly while ignition is occurring.Continue to hold the button down for at least 15 to 20 seconds after the pilot light is visible to ensure the flame stays lit.