The pilot light is used to ignite the gas which in turn heats the water in your boiler and fires up your central heating. Follow these steps to solve the problem:
If you’ve followed the above steps and the pilot light still won’t ignite, there could be a problem with the thermocouple. This is the sensor that opens up the gas valve when the pilot light ignites; this is to ensure that gas doesn’t leak out from your boiler when there’s no pilot light present.
If this is the problem, you’ll need to get it looked at by a Gas Safe registered engineer.
If your boiler is igniting but you’ve noticed an orange or yellow pilot light, it may be producing carbon monoxide. This is an odourless, poisonous gas which can be fatal.
If your pilot light is any colour other than blue, turn off the boiler immediately and contact a Gas Safe registered engineer.