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How to replace the power head On the newer ones there are only 2 screws 1 top left and the other bottom right. you don't have to turn the water off or drain anything to do this.
Click on picture to see larger picture this is a newer one see the brass screw top left. To replace this head. just loosen the two screws and pull the old head off put the new head on tighten the screws then connect each wire just like the old one was. (make sure you turn the power off first) and you are done.

Honetwell zone valve motor