Hello, seems these boilers feature a lot here! Anyway my problem having read through these pages appears to be similar to no air in the expansion vessel (pressure drops when off, rises upto 3 whn swithced on and the safety valve passing water). However I'm a little unsure if it just a case of repressurising the vessel. Is this the grey sphere behind the large front cover? If it is I've tried to pump up but it doesn't seem to want to accept air. Am I doing something wrong or is there another problem here?
Many thanks.
Many thanks.