Pipes clanging when DHW calls or heat

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Valve would be in ch position from previous demand
At night AFTER the heating has gone off, put the power too the heating system off for 5 seconds and restore. See if valve bangs

When the heating is shut down on a night and there is no power to the Actuator, the spring will pull the valve back to the HW position, that is the default setting ( HW prority ) !.

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