I just had a particularly frustrating issue with one that would not regulate and sounded stuck. When I take the stepper motor out, it turns freely. The piston in the valve housing moves freely when I move it by hand. The stepper motor threading is easy to screw in, but once it's back in place, it's stuck again and won't move.
I put it back in the valve it came with to check if the motor is the problem, but it works just fine, so it is an issue with the valve itself, but I cannot imagine what the issue could possibly be.
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