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Evap Coil Keeps Freezing on GE PFS22MIS

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The evap coil keeps freezing solid. When problem first started, I noticed that the condenser fan was not working. I

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Old 02-04-2012, 08:15 AM
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Default Evap Coil Keeps Freezing on GE PFS22MIS
Model Number: PFS22MIS   Brand: GE   Age: 5 - 10 years   

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The evap coil keeps freezing solid. When problem first started, I noticed that the condenser fan was not working. I replaced the main board, the condenser fan motor.Restarted system and problem returned. Next I replaced the evap thermostat. Once thawed and restarted everything will work fine for about two weeks. Then the ice buildup forms and the fridge section warms up. Used multimeter to check resistance of defrost heater. Showed about 34 ohms. I was told that this model does not have a defrost timer so not sure what to check next.


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  #2 (permalink)  
Old 02-05-2012, 11:42 AM
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Default Check your thermister

Quote:
Originally Posted by dring21 View Post
The evap coil keeps freezing solid. When problem first started, I noticed that the condenser fan was not working. I replaced the main board, the condenser fan motor.Restarted system and problem returned. Next I replaced the evap thermostat. Once thawed and restarted everything will work fine for about two weeks. Then the ice buildup forms and the fridge section warms up. Used multimeter to check resistance of defrost heater. Showed about 34 ohms. I was told that this model does not have a defrost timer so not sure what to check next.
The main control board initiatates the defrost cycle. My GE defrosts every 16 hours for 30 minutes. I have read posts on other boards that people have changed out the evap thermostat only to find they have received a bad one. To check the thermostat (thermister) it has to be frozen or you will read infinity when checking a warm one.

Another posible problem may be that the unit is low on refrigerant. You can check the amp draw to see that it is drawing proper amperage. A low charge would cause the evap to freeze up. The amp draw will be indicated on the compressor tag/label.

Did you also check the evap fan motor? Is the fresh food compartment getting cold air in through the top of the box from the freezer? A frozen/blocked evap fan would cause the unit to freeze up, and not let cold air into the fresh food side, and ice up the evap.

You are on the right trail though.

I am not a tech on this board, just come here to see the problems and solutions provided. I am a certified tech always wanting to learn more.

Good Luck
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  #3 (permalink)  
Old 02-06-2012, 02:14 AM
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Default

They may have shipped you a bad board.Defrost the coils and let it run for a period.
Pull the cover off the motherboard and locate the 3 pin power connector and remove it. Place a wire jumper between the mating pins labled line and def. If it defrosts, replace the motherboard. (AP4436216) If no defrost, you either have a bad heater, defrost thermostat, or a broken wire.
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Last edited by richappy : 02-06-2012 at 02:17 AM.
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  #4 (permalink)  
Old 02-06-2012, 06:58 PM
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Default Bad Defrost Element

It was the defrost element. No evap fan air coming through the frozen up coil. Unplugged it overnight and everything worked great afeter I replaced the heater. Already resolved the problem.
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