The pilot light comes on and the boiler ticks but does not ignite the main burner. The ticking gets noisier and turns into a loud hum but still doesn't light.
Does anyone know what might be causing it? I know the boiler is old but ideally I don't want to replace it at the moment
Does anyone know what might be causing it? I know the boiler is old but ideally I don't want to replace it at the moment