Samsung, side by side refrigerator, Model number RS2545SH. no drinking water? replaced filter, no change. Ice maker still makes ice and you can hear the water refilling ice tray as needed. about a week ago, same thing happen, I inserted a wire up the water dispensing hose about 12 inches and somehow water started to flow. this time, I insert almost 36 inches of wire and negative results. I don't think the water is frozen in the tubing because I get water to the ice maker. any help would be great. thanks!

the problem first was fixed by replacing the "heater" by a professional, solved the water tank from freezing and the water dispenser was working....for awhile, then after a few days the water dispenser stop dispensing...problem was the cover for the heater was warped and damage from the previous freezing issues, it would not seal the area around the heater, which cause the tank to freeze again...required a replacement cover. No problems since the replacemnet of the cover. total cost was around $250

This was first symptom that we had, next (about 2-3 days later) refig would not cool even though it says it is 34 or whatever because the temp probe was embedded in ice forming in evaporator. I replaced probes, water heater, defroster and keeps coming back. It was so frozen that had to wait until ice thrawed to get back panel off since ice was in styrofome. If you let it defrost by unplugging for a day or two it will work again until it freezes again.
Check temp with thermometer, I used outdoor wireless probe if it is high then probably same problem, if it is still cooling it may just be water heater which is taped to panel to help keep it from freezing, unsure of part number.

Hope this helps, Samsung has been the pitts, no help at all.
Rick