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Hello, This could be a couple of issues. One would be a frozen water tank inside the fridge. Usually, the water tank is located at the back of the vegetable crisper drawers. Remove the drawers and inspect the tank and see if it is frozen.
If the tank is not frozen, try to pull the unit off the wall, go to the back and remove the lower panel. Then have some one press the water dispenser and observe the back part if you would hear a water solenoid valve engaging or making a clicking noise. This would indicate that the solenoid valve is fine. If there is no sound at all, then you could have a bad water inlet solenoid valve. You can further test the dispenser circuit if it is fine by swapping the wires of the two solenoids down there. The other one is for the ice maker. If you swap the set of wires ( of course, un plug the unit first ), have someone press the dispenser pad on the front, and hear if the other solenoid ( for ice maker ) would click and would let water flow to the ice maker, This would verify that the circuit is working. If still, the water inlet solenoid valve would not click or engage, then you have a problem with the dispenser circuit.
Another issue is if the water inlet solenoid valve would not engage even with a know live voltage, then you should replace the water inlet solenoid valve.
If everything is engaging, then you could have a frozen water line inside the freezer. The insulation could have been penetrated and the line froze up that is why it would not let water flow. If this is the case, then try to increase the set temperature of the freezer, hopefully, the hose would melt and let water flow ot to the front.
Thanks for prompt reply. Will not be able to work on the fridge/freezer until Monday, but I do
not have some clear ideas for where to look/test. I may have some difficulty in moving such a
heavy unit away from the wall but will have to try. (Made a typing mistake on line 2. Should
read "but I do NOW have some clear ideas...")