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hi ! if the heating pipe gets hot while you are running the hot water on a combi then the diverter valve is letting by .if the heating pipe gets hot more than 6inchs down the pipe {blatant flow} also if it doesnt and the water goes cold does the boiler go out ?because it may be down to a...

sounds like it could be either a problem with the pump or the flow pipe to the heating side has a slight blockage allowing the heat to push down the coil on your cylinder faster than through the heating circuit and returning to the boiler thus shutting off early as satisfied on the thermostat...

Hi all my name is anthony and i run a small building firm in the woking surrey area .Specialising in heating and gas engineering and carpentry and joinery also electrical and plumbing for the domestic market ACSL Building Services hopefully you will take a look at the website and if there is...