Water Dispenser Won't Dispense

The icemaker works great but there is NO water coming out of the dispenser in the door. In the AM it worked fine and in the PM the water dispenser was dry. I’ve done all the troubleshooting tips in the owner’s manual. I checked the freezer and refrigerator temperature controls and both freezer and fridge settings are well below the coldest so I don’t suspect a frozen line. What do I try next before I have to call a repairman?

I think you need a new ice maker.