hi,Im Kerry and Im hoping somebody could shed some light on my current situation! 3 differnt plumbers have been out to my glow worm combi boiler over the last few weeks but the problem is still occuring! the pressure on my boiler drops to 1 and then shuts down. the first plumber said that a valve was really dirty and dirty water was going outside through the copper pipe. anyway, he cleaned it and said the problem was sorted. wrong! a couple of days after that the same thing happend and so on and so on! the last plumber that came said there was nothing wrong with the boiler and that the only other way we could be loosing pressure would be through a leak in the system. He asked me if there were any pipes under floors downstairs and he said no, then he said that it couldnt be that then because a leak of that amount of water every couple of days would be apparent! then, before he left he said that it must be in the system somewhere!!!! I am so confused because first they tell me one thing and then they tell me something different and I just dont know what to think. I live here alone and cant afford to get a plumber out to test the system. to be honest, I dont think there is a leak, I still think its the boiler! there isnt any water going outside from the copper pipe any more but there is another pipe upstairs at the other side of the house and the pipe does go to the boiler but none of the plumbers have mentioned this! during the summer I could hear a constant dripping sound through this pipe and wonder could that be the problem maybe? can any of you possibly help me with this problem because I dont know what else to do! home serve say the boiler isnt at fault and I am certain there isnt a leak anywhere so where do I go from there? today the same thing happend again as I knew it would and I have had to fill the system up yet again. I must have done this at least 20 times now over the months and im not getting the problem resolved! are they right in what they are telling me? does any body else have other ideas perhaps that havent been mentioned to me? I really hope so! I wouldnt ask but I really am at a loss! thanks guys