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Thanks for the replies. Would it be best to renew the valve and actuator or just valve. Also any way of getting round draining all rads and tanks to fix new valve. Thanks

Hi can anyone help. I have a fairly new ( 2 years old) complete hot water and central heating system. The only problem now is that the central heating comes on when only the hot water is on. I have a drayton ma1 3 - port mid position valve and actuator. The actuator slider on the side moves...