First checked if the water line was freezing by (1) warming up the water tank (behind the veggie bin) with a blow dryer and (2) unhooking the water line below the fridge to see if water was getting to the door. Still no water. By installing a new water filter, I could hear gurgling, meaning that water was getting to the filter. The water exits the filter then goes back to the water valve. So the 1st stage of the electric water valve was sending water to the filter, but the 2nd stage wasn't sending the filtered water to the door. So I replaced the electric water valve and now everything works again! Easily accessible from the front; didn't need to pull out the fridge.