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It’s not the problem. The problem is calling CH only. It passes the microswitch you hear the click and the pump start for a second or two then it moves back approx 2-3mm passed the microswitch turning the pump off. It most definitely isn’t working correctly.

The actuator only. Head is moving freely and actuator still does it when off the valve.

I have a danfoss hsa3 with 3 way valve. In the last month it has stopped functioning correctly. Now when CH is called only the motor winds, clicks the midway micro switch briefly then clicks back slightly past the switch turning it off again. If HW and CH are called then it’s both work. HW...