Official KitchenAid upright freezer parts

How to deal with excessive frost inside your KitchenAid upright freezer

Some frost inside the freezer is normal, because each time you open the freezer door, warm, moist air enters the freezer and forms frost. But if excessive frost forms quickly inside the freezer, it could be that a damaged door seal is constantly allowing warm, moist air into the cabinet, resulting in excessive frost. Check the door seal and replace the seal if damaged.

A crack in the plastic liner inside the freezer cabinet can also allow warm air into the freezer and cause frost. Check the inner liner and repair any cracks using a liner repair kit.

If you see frost on the evaporator cover in the back of the freezer and the freezer isn't cooling well, then a failure in the automatic defrost system could be causing the frost. If the defrost heating element that melts frost off the evaporator fins fails, frost will cake up on the evaporator and interfere with airflow and cooling in the freezer. A failed defrost bi-metal won't allow current to reach the heater so a failed defrost bi-metal will also cause frost on the evaporator and inhibit cooling in the freezer. A failed defrost timer won't advance into the automatic defrost mode so the defrost heating element would never turn on to melt frost off the evaporator. Check the defrost system if you see frost only on the evaporator cover.

Common KitchenAid upright freezer replacement parts

• Control panel. The freezer control panel turns on or off freezer functions such as power, vacation mode and the ice maker.
• Drain hose adapter. The drain hose adapter provides a connector to attach a drain hose to the freezer.
• Thermistor. The thermistor is a temperature sensor within the freezer that sends information to the electronic control board.
• Temperature control thermostat. The temperature control thermostat is mounted in the control housing area and controls the temperature inside the freezer. It turns the compressor on and off as needed to maintain the set temperature in the freezer. The thermostat has a temperature sensor tube that detects the actual temperature in freezer compartment and controls the temperature based on the reading from that sensor.
• Overload/PTC relay. The overload/PTC relay starts the compressor motor. It has 2 components: an overload protector that trips when the compressor motor overheats or locks up, and a relay. The relay manages the start-up of the compressor and keeps the compressor running until the compressor cycles off.

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