Answer Hi Leo. I would use the digital capacitor Tester / Volt/ohm meter part # MA-DM1 to assist you in repair. It is suggested the replacement of the encoder board part # WR55X10150 replacement. I would use the link http://forum.appliancepartspros.com/refrigerator-freezer-repair/4220-ge-refrigerators-gs-ps-models-evaporator-fan-motor-test-replacement.html provided to explain the main control board part # WR55X10942C diagnosis. Let us know how to assist in the future. Thank You. Read More... Answered by AppliancePartsPros.com | Tuesday, April 24, 2012