Customer Questions and Answers for Refrigerator Defrost Timer by Whirlpool

Amy,

You will want to make sure that the black lead wire on the timer motor goes to the pin numbered 1. If not then the unit will not work properly. Also you will want to check to see if the coils in the freezer compartment are impacted with ice. If so then the issue would be a defrost issue in which you can put the timer into the defrost cycle and see if the heater comes on if not then the heater or the defrost thermostat would be faulty and need to be replaced.