Hi. I am having problems with my vokera compact 24. When I turn my hot water tap on my boiler just continues to flash and I don't get hot water, when I switch it to on for my central heating and hot water the green light continues to flash but it sounds like it's trying to fire up but doesn't all at the same time. Eventually the raidators get warm but not hot... The green light doesn't stay on... Please help... 
