Amana refrigerator, bottom freezer. Back keeps icing up. I have unplugged and thawed it twice, within 2 weeks it is frozen again and freezer warm

Check your defrost timer. It may be bad.

Sounds like it could be low on gas (refrigerant).
Suggest have a qualified tech test and possibly add more.

HI,IF THE FREEZER IS BUILDING ICE ON EVAP COVER THAT IS NOT DEFROSTING PROPERLY,REPLACED THE CONTROL BOARD AND DEFROST B-METAL TO REPAIRD THE PROBLEM..

you need the defrost heater replaced by the sounds of it.
when u unplugged it you allowed the build up of ice on the evaporator to melt therefore increasing the air flow again.
Regards

Ian

you will need to defrost it. the freezer is what keeps your fridge cool. the vent where the cool air goes up to your fridge is sealed or frozen.
unplug the fridge and open the doors and let it defrost.
plug it back in after a few hours and it should be working again.

The doors not being shut can make it freeze up,Just thaw again and make sure the doors get shut each time and see what happens,just post back details if it doesn't work after thawing

First I need you to unplug the refrigerator. Remove the rear panel in the back of the freezer and tell me if the coils are clear, frozen or blocked with ice. Make sure both fans were working before unplugging. Below the bottom and the fan inside the freezer. This will let me know if there is a problem with your defrost system. If frozen over use a hair dryer to defrost coils and let me know. We will need to check the defrost heater and defrost thermostat. Let me know when you are ready or if this is helpful, Thanks Sea Breeze

Sounds like your coils are getting plugged,(excess ice in and around the coils)if you have a cooler or some other place to keep your food cold,turn off or unplug the fridge,you want to defrost it,for the freezer place pans of hot water in it to speed up the process,leave doors open,should only take around 4 to 12 hrs.A good time to clean it to lol.
Hope this helped.Let me know.Also rate me.
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lenwest

Chances are if they are getting cool but not cold-

1) the evaporator fan in the freezer is not running
2) Defrost heater has failed
3) Defrost sensor has failed
4) Defrost timer/refrigerator control has failed.

Check for ice build-up on the back wall of the freezer. If there is ice, unplug or turn the unit off for 6-8 hours with the doors open (put any food in a cooler with ice to maintain). Note water may come out of the refrigerator.
Plug the unit back in or turn it back on, close the doors, and check temperature after a couple of hours of operation. If all OK, you will need to have the above tested, or, if you know how to use a multimeter and can read a schematic/wiring diagram, I can instruct you on how to check the above.

either you ice maker is overflowing,(not likely but possible) or you have a clog in your drain behind hte rear cover, not allowing defrost water to drain away in to the pan under refrig instead flowing to bottom of freezer area. rempove the rear cover and thawe all ice, especially near the middle of hte aluminum oan yull find a clogged/frozen drain tube