Thanks to everyone who responded to my thread. It did turn out to be the soft start. When I first swapped out the soft start for a new one it still didn't work. I then realized the flow valve was turned all the way in on the new one. I simply used the same amount of turns on the old valve for the new valve and it was up and running.
A big thanks and thanks for the contact info in case I have other issues with these stackers.
Gord