The freezer door water dispenser is constantly on. Only way to stop flow is to shut off the water supply in the basement. The lights on the front panel switch when pressed (water, crushed ice, Cubes), but water continues to flow out the dispenser. I don't know where the valve is that controls the water flow, but I assume it is stuck open. Is there a way to get at the valve to see if it is closing? At this point I don't know if there is any problem with the ice maker as I have to immediately shut off the water to prevent a flood. The paddle on the ice maker seems to work when pressed as the ice dispenser flap open OK.

No problem Simon, and thanks for your help. I'll replace the valve and send feedback when it's done. Manxman..

Well, the problem was the valve, works fine now. New problem is the leak from the 5/16" plastic tubing (small cracks) in the loop leading out of the water (blue) side of valve. I believe this goes to the water tank ( AP3188462) behind the crisper drawer, but the tank looks to have sealed tubing connections. Where does the tube from the valve connect to the tank tubing? Is there a 5/16" union somewhere like the one under the front door that feeds the door water dispenser? If so, I may only need to buy the plastic tubing (AP2065182) to make the repair. Hope you can enlighten me on how to proceed. Thanks. Manxman.