Hey Harry. We have a glow worm 30sxi boiler for 2 years and we have a number of problems with it, including the one you are having. A pressure drop to 0 bar usually means your sealed system is leaking and you not to let more water into it. Find the cold fill on your system and top it up until it fires then stop. Overfilling will pressurise your system too much. If this does not work then you may have the problem we have - the electronic on pressure sensor are defective. An engineers, I am afraid. Hope this is helpful
Mark, November 2007
