Is there a way to test a evaporator fan motor?
You can use the instructions posted here: http://forum.appliancepartspros.com/refrigerator-freezer-repair/4220-ge-refrigerators-gs-ps-models-evaporator-fan-motor-test-replacement.html#post11066
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The part number for the evaporator fan motor is [COLOR=#0066cc]AP3875639[/COLOR]
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The part number for the main control board is [COLOR=#0066cc]AP3950129[/COLOR]
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Here are the break down diagrams for the GE refrigerator Model GSS20IEMBWW
Good luck.
Gene.