I have a worcester 28siII combi.This morning the pressure gauge went to zero and the system stopped working.I noticed a small leak from the inside of the boiler.This water was cold so I assume it is a leak on the Drawn hot water side of the boiler,as the heating worked this morning.The question is why did the pressure go to zero,Ithought it was only the c/heating side that worked under pressure.
cheers.
cheers.