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The motorized valve seems to be working. I took it off and can see it turn + light go on and off when I move the thermostat on the HW tank.

Hi, First post here so bear with me. I've got a Keston C40 boiler which runs the underfloor heating and hot water in the house. The CH seems to fine but there is no or little hot water. I checked the valve to the inlet of the HW tank. It seems OK but I can't feel much heat on the pipe...