When the coils within a refrigerator become too cold, the defrost timer cues the heater to click on and work to melt any excess ice buildup. You will have to remove any objects that are in your way such as the contents of the freezer, freezer shelves, icemaker parts, and the inside rear, back, or bottom panel. and access this component and check it, you can determine whether it is open. A defrost thermostat is the temperature-controlling device within the automatic defrost system of a refrigerator. Thermostat Convex Bimetal Disc and Plunger. You need the defrost bi-metal switch to stay cold. Thermostat Concave Bimetal Disc and Plunger. Note: Do not totally defrost the evaporator coils. I looked for the bimetal defrost thermostat clipped on the evaporator. This DIY repair guide gives step-by-step instructions on how to replace the defrost bi-metal thermostat in a top-freezer refrigerator. You will find the defrost bi-metal switch fastened to the top right, or left corner of the evaporator coil. The defrost thermostat is located near the defrost heater and is wired in series. The defrost bi-metal thermostat shuts off the defrost heater if it gets hot enough to damage the evaporator. When the temperature reaches 50-70 degrees (F) the defrost bimetal turnd the defrost heater off. " The defrost thermostat is a commonly replaced part on a fridge that isn’t cooling properly. There are three components to the defrost system: a timer, a thermostat, and a heater. Thermostat Housing, Bimetal Disc and Plunger. removed the the back panel to expose the evaporator. Other commonly replaced parts when the freezer is cold but the refrigerator is warm are: Defrost heater Evaporator fan motor Damper control assembly Thermistor Temperature control board The thermostat is wired in series with the defrost heater, and when the thermostat opens, the heater shuts off. then I emptied the freezer. Kilxon 7AM Series Safety Thermostats are often used to protect motors from overheating. Hello Jorge, thank you for your question. If the defrost bi-metal thermostat fails, the heating element doesn't turn on, and frost builds up on the evaporator. Klixon 7AM Safety Thermostat . The defrost heater should measure about 20 to 30 ohms of resistance. It is usually located at the back of a side by side freezer or under the floor of a top freezer. It will be necessary to remove obstructions such as the contents of the freezer, freezer shelves, icemaker and the inside rear or bottom panel of the freezer. The defrost bi-metal switch contact is closed when it is cold, and open when it is warm. The first parts I would check would be the Bi-Metal Defrost Thermostat Part Number: WPW10225581, Air Diffuser Part Number: WP2209751, Electronic Defrost Control Board with Wire Harness and Screws Part Number: 4388932, Heater, Defrost Part Number WP2323198, and the Evaporator Fan Motor - 120V 60Hz Part Number 4389144. It needs to be cold in order for you to test it. Page 1 of 2 This bimetal senses the temperature from the evaporator. A technician would normally "jump" or bypass the bi-metal thermostat (with the refrigerator unplugged) and then check to see if the heater will work in the defrost …

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