I have replaced the icemaker in my refrigerator, and am not getting water to the maker. Original problem was that water was pouring into icemaker(fast) and not stopping, running out onto floor. Assumed it was icemaker not stopping water, but when I installed new unit... no water. I have checked the fill tube from back of unit into freezer and there is no frozen ice. There is not any water in tube from valve to the back of the unit. I still get water from the water dispenser in the door. Don't know what to check next

Try swapping the wires on the dual water inlet valve on the back where the water supply comes in. Then try the water dispenser. The water should go to the ice maker. This will tell you weather or not the ice maker valve is working and if the line is clear.

I just switched the 2 plugs back, and the water dispenser does not work. No sound from it. Does it need to cycle for a while?

Ok, I had turned off water, then forgotten to turn water back on.

Now when I press ice dispenser, I get a puddle of water on the floor did not see origin.(water dispenser dispensing and overflowing)

No leaking from the back, I think when I cycled the icemaker, with plugs switched, it sent water to dispenser. there is no water in the line between the valve and the entry to the freezer at top to unit. Seems like the valve is not opening. Considering that before I replaced icemaker, it was stuck open(had to shut off all water to fridge), it sounds like it may be the valve. Is there a way to "clean it", or to test it? Water lines are diff sizes so can't swap them.