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Thanks Tony, I'll try replacing the motor first, it looks reasonably straightforward. Can you confirm which direction to manually rotate the valve spindle to set to HW only in the interim ?. Thanks again David.

I think I have a problem with the Honeywell V4073A Mid Position Valve on my heating system. The CH seems to be heating at all times, even if only HW is selected at the controller. I have removed the powerhead from the valve and there is no rotation of the output shaft on the powerhead regardless...