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When I depressed the button inside the schrader valve to check for pressure some water came out. Whilst I was working away from home my wife called the heating engineer out because of the water coming from the schrader valve, she told me as far as she was aware all he did was refill the heating...

I hope someone can help me as my local heating engineers don\\\'t seem to have a qlue. I have a pressure problem with my combi boiler. Basically when the heating is off the pressure gauge falls to zero. Before I start the heating system I have to repressure the system to 1 Bar, when the...