VCW GB 221 H Could somebody please give me some advise on my boiler, which has broken down? Or is there anybody with the service manual to this one? The hot water is still running luckily. However, the pressure is dropping constantly and the CH won't start up. Sometimes when I switch it of and do not touch it for a night, it works again for a little while in the morning but then it switches off again after half an hour.