There should be an adjusting screw in the pipework. If you can find it, it is a simple matter to adjust, with a screwdriver. If left, it will make the thermocouple burn out prematurely.
davidj
November 2011
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.