The motorised valve is not moving at all when the central heating is switched on and hence no heating. The hot water is fine and if I move the vale the radiators upstairs become warm but the pump is not engaged. How can I get the central heating to work or do I need a new valve? Isf so is it something I can do myself?
I have checked the thermostat and programmer and they are still on the settings for May when the heating was last on. When heating is turned on the spindle does move and the spring inside the valve moves as well but the actuator (?) arm does not move at all, so there is an electricity supply. The radiators upstairs get warm but the pump is not engaged hence no heating downstairs.
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