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I reattached a radiator last night as I had been doing some painting behind it. However, once I had done this the pressure in the central heating system dropped to zero. I then increased the pressure in the system by opening slightly the cold water tap to the combi boiler and closing it...

I've an Ariston Combi-boiler which was installed in 2000 by the previous owner of my house. The problem with the boiler is that I cannot get hot water unless the central heating is running. Turning on a hot tap without thew central heating on has no effect on the boiler, and it does not come...