The freezer works well, but it looks like it is not defrosting. The lower part, the fresh food section is not cooling and the fan, although working, is not pushing cool air into the fridge. It cools when I turn off the entire unit and plug it back in for a couple of days. What part should I replace?
Answer Hello Rick. The most common part failure on this design is the defrost thermostat WR50X10010. I do, however, reccommend testing the component before replacing it. While it is cold, it should read continuity. When it gets above about 50°, it should read open. If this is the case, be sure to defrost the unit with a hair dryer before reassembly. The defrost circuit is designed to melt the frost build-up between defrost cycles and is not capable of melting the ice that accumulates when the defrost cycle hasn't been functioning properly. If the defrost thermostat reads good, the next culprit will be the defrost timer, as the defrost heater WR51X464 in this model is a calrod element and while they can fail, failure is much fewer than the glass tube type heater. While your in the evaporator compartment testing the defrost thermostat, you can test the defrost heater. The defrost thermostat attaches on one end to the defrost heater. The heater should read anywhere from 15 to 40 ohms of resistance. The defrost timer is easiest to test. You should find the defrost timer in the ceiling of the fresh food compartment. If you look directly up at the control housing assembly, you will see a small hole with a plastic piece inside which has still another hole. I use a small screwdriver to reach inside the first hole, into the second hole and turn clockwise. If you doing it right, as you turn, you will hear a clicking. Don't turn too fast as you will soon notice a louder click and the compressor and fans will shut off. You have just forced the unit into defrost. Now you just wait. After anywhere from 18 to 28 minutes, the defrost timer (if working properly) will kick out of defrost and the fans and compressor will come back on. If you wait 30 minutes and this has not occurred, the defrost timer WR9X520 is bad. If no tests prove a component bad, the problem is probably the electrical contacts in the defrost timer. I hope this was useful. Good luck!