I have a problem with my Glow worm Fireblaze back boiler. The boiler has been out of use for a couple of months over the summer period and now refuses to light. I have followed the lighting procedure as per the instructions but there appears to be no gas coming through when the button on the valve is depressed. Usually you can hear and smell the gas exiting the valve when attempting to light it but there is nothing. Is there some way of bleeding the gas valve? The fire is working ok so gas is getting through to that so i'm guessing an airlock or something? Any help welcomed, i'm getting moaned at now as we have no heating and the weather is getting cooler!!! :?