I have a samsung refrigerator model rs25h5111sr/aa that is no getting water to the ice maker. what would cause that The water dispenser is working fine

It might be low water pressure or the water filer or the valve has gone bad is faulty for your ice maker in your fridge.It

Is it frozen in? If so, thaw it and find out where water is coming from

Usually due to CONDENSATION due to bad door seals or a plugged evaporator drain line? Can use a soft flexable tubing and very hot water to clean it out. Bad door seals usually need replacement, but u can use a blow dryer and something to pry it closer to the door wall while blowing hot air on to it. To create a seal, to test for bad door seals place a dollar bill in between the door and wall of fridge where it closes. Then slide out the dollar bill with door closed. It should offer some resistance and not be easy to pull out.
Most all fridges have a drain. Look inside your fridge for a "V" shaped channel with a small hole. This hole leads to a tube and a small pan which sits on top of your refrigerator's compressor. The defrost cycle causes water to run into the channel, down the tube, and then it generally evaporates with the heat of the hot condenser/compressor.
However, if that tube is clogged with food crumbs, particles , debris etc, you will have to clear it to get back to a normal mode of operation. A toothpick, pipecleaner, straw or a cotton bud can often do the trick.
Even a frost free freezer will still ice up at times in the areas away from the heated defrost area and the drain line can freeze. This icing causes the pipe work to the compressor to ice over or sweat and cause a puddle. Or if the drainage has frozen over, it will need to be de-iced. ( usually the line is under the freezer bottom plate covering. Towards the back of the unit) And there is another inside the fridge area also.
Give the freezer a good overnight defrost until it's totally clear of ice in addition to making sure the drain is clear to the pan at the back and then

May be it needs reset. Unplug the unit for 12 hours and then reconnect to see if that makes any difference.

Before going to buy any parts directly.
Go through this troubleshooting help links.

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This is list of refrigerator problems, which is normally faced in refrigerator.
You can go through the details, by clicking the link below:---

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Refrigerator is not cooling properly?
http://technoanswers.blogspot.com/2011/06/refrigerator-is-not-cooling-properly.html
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Both refrigerator and freezer not cooling properly in refrigerator?
http://technoanswers.blogspot.com/2011/06/both-refrigerator-and-freezer-not.html
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The ice maker not working: ---
http://technoanswers.blogspot.com/2011/06/ice-maker-stopped-working.html

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Compressor not running on refrigerator?
http://technoanswers.blogspot.com/2011/10/compressor-not-running-on-refrigerator.html
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Water dispenser not working on refrigerator?
http://technoanswers.blogspot.com/2011/10/water-dispenser-not-working-on_19.html

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Ice maker stopped making ice?

http://alltypesofpartsreplacing.blogspot.com/2011/10/ice-maker-stopped-making-ice.html

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Water Overflows in Ice maker and freezes inside?

http://alltypesofpartsreplacing.blogspot.com/2011/10/water-overflows-in-ice-maker-and.html

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How to replace Ice maker assembly?

http://alltypesofpartsreplacing.blogspot.com/2011/10/how-to-replace-ice-maker-assembly.html

These will help.

Thanks,.

What is the model number of the unit?

May very well be a stripped gear in the drive unit. Unplug ice maker and remove mounting screws. Out of the freezer remove front cover and inspect drive gears for damage. Replacement gears should be available through a dealer for you make and model number.

sounds like you got a water valve problem. it will be found at the lower back side of fridge where the water hook up is at.

The water line freezes inside the freezer door. There is now an add-on water line heater you can install to thaw the line.