I have a Frigidaire freezer Model FFU21C3AW. It didn't seem to be running as cold as it should have been and I had noticed a lot of frost on the shelves and coils so I turned it off, and defrosted it. When I turned it back on I noticed that frost started to form on the upper coil, and the temperature was warmer than it should have been at the bottom of the freezer. I figured that the gasket was not sealing properly and condensation was getting in. Over time the temperature got warmer, and now is not cooling at all. Any thoughts, ideas, suggestions?

Since the compressor ran constantly for unknown # of hours - the problem most likely is in the sealed system. Bad compressor, clogged filter/dryer, compressor valves worn and unable to develop sufficient head pressure for refrigeration.

Another possibility is a failed thermostat HERE

Repairs of this nature could cost upwards of $500.
I hope you're not attached to the freezer :D

If you want to tackle the repair yourself... CLICK HERE and HERE for expanded views and parts.

CLICK HERE for a helpful service manual if you are going to attempt your own service.

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Thank You :D

Hi, With the information you supplied i'm going to assume there is an ice build up at the rear of the freezer. Your problem is going to be with your defrost system. I will also assume you have the ability to repair this yourself. This is going to be one of three problems with your refridgerator, 1st thing to do is remove shelfs and panel in the back of the freezer...you should see ice build up on the evaporator...don't worry get a hair dryer and melt the ice. Next locate the wires for the heater...using a multi meter test the heater for condinuity...if the heater is bad replace it, If the heater is good replace the defrost thermostat..the stat normally is a barrel looking part clipped onto the evaporator pipe. The last possible problem could be the evaporator fan, have you heard the fan running in the past few hours?..if you are not sure pull the panel out to where you can see fan and watch it over an hour to see if it turns. I have included links with pictures of what the parts you need to check are: http://romulusappliance.com/manufacturers/maytag/refrigerators/575432.JPG defrost stat http://www.hotekalliance.com/UploadFiles/2008627111553382.jpg heaters http://www.applianceblog.com/archives/EvapMotor1018185.jpg evap fan. Hope this helps. If you have any other questions please feel free to comment again. If you decide to get a repair guy in should not cost you any more then $120 - $200 depending on make/model/problem Good luck!