Answer Hello Roger, This model has an electronic adaptive defrost board W11227239 in place of the defrost timer. It is inside the control box. Checking the Adaptive Defrost Control 1. Disconnect the unit from the power source. 2. Open the fresh food door and remove any items on the top shelf. 3. Remove the light shield and the temperature control housing. Remove the light shield cover by pulling down on the back corners of the cover and sliding the cover forward. Remove the fascia/radiant shield mounting screws. Remove the control housing mounting screw at the back of the control housing. Slide the control housing to the right and lower it from the control housing supports. 4. Connect the refrigerator to a wattmeter. 5. Make sure compressor is running (cold control closed). 6. Using an insulated number 22 jumper wire short between L1 and Test; this will put the refrigerator into a defrost for approximately 23 minutes. 7. The watt meter should read between 500 to 600 watts depending on the model. Read More... Answered by AppliancePartsPros.com | Monday, August 3, 2015