How To Test Refrigerator Defrost Thermostat: Top Full Guide 2023

How To Test Refrigerator Defrost Thermostat Top Full Guide 2023

It is important to test your refrigerator defrost heater thermostat before you buy it. How To Test Refrigerator Defrost Thermostat? How will the testing process affect the refrigerator? It is possible to do this without hiring a professional. This problem is sure to raise thousands of questions.

The testing process is simple and efficient if you read the whole article. Publican Anker demonstrates how to test your refrigerator without missing any detail. The process is quick and easy enough to be a surprise.

What is a Defrost Thermostat?

What is a Defrost Thermostat

A defrost thermostat is a device that helps regulate the defrosting process of your refrigerator.

The defrost thermostat is responsible for turning the fridge’s compressor off and on during the defrost cycle. It monitors the temperature inside the fridge and turns the compressor off when the fridge reaches a specific temperature. The defrost thermostat then turns the compressor back on when the temperature inside the fridge drops below a certain point.

Where is the Defrost Thermostat Located?

The defrost thermostat is located in the refrigerator. It is usually located near the evaporator coils. The defrost thermostat is responsible for turning the defrost cycle on and off.

When the refrigerator is turned on, the defrost thermostat senses the temperature of the evaporator coils. If the coils are below freezing, the defrost thermostat turns on the defrost cycle.

The defrost cycle melts any frost that has built up on the coils. Once the coils are thawed, the defrost thermostat turns off the defrost cycle.

How To Test Refrigerator Defrost Thermostat

How To Test A Refrigerator Defrost Thermostat

To test your refrigerator’s defrost, follow our step-by-step guide. After diagnosing the problem, we can provide the OEM replacement for your appliance.

  1. Before you test your defrost’s functionality, disconnect its power supply. This is easiest done by unplugging the unit from your wall. You could also trip the appropriate switch on the circuit breaker panel or remove the fuse from the home’s fuse box.
  2. If you are unsure if you have the skills or ability to complete the repair, consult an appliance technician.
  3. Find the defrost in your refrigerator. It may be under the refrigerator’s floor in freezer-on-top models. In other models, it might be at the back. The defrost heater can be found on the side of a side-by-side refrigerator. The thermostat is wired together with the defrost heating element.
  4. When the thermostat opens, it shuts off. You’ll need to get rid of any obstructions, such as the contents and ice maker parts, freezer shelves, ice maker parts, and bottom or rear panels.
  5. Retainer clips or screws may hold the panel in place. To remove the panels from their frames, either a screwdriver or screws loosen them.
  6. You may need to remove the plastic molding from older refrigerators before accessing the freezer floor. It is important to be careful when removing the mold, as it can break quite easily. Warm it first with a warm, damp towel.
  7. Two wires lead from the thermostat. These wires are connected to terminals using slip-on connectors. To release wires from terminals, gently pull on connectors. To help you, you may need needle-nosed scissors. Don’t pull on the wires.
  8. A clip, screw, or clamp may hold it in place. Some models have both the thermostat and clamp as one unit. Other models have the thermostat clamped around the evaporator tube. Other models allow you to remove it by pressing the clip down and pulling it upwards.
  9. Your multimeter should be set to R X 1 Ohms. Each multitester’s lead should be placed on a wire. If your thermostat is cold, your multitester should read zero.
  10. Besides that, If the temperature is between forty and ninety degrees Fahrenheit, this test should give an infinity reading. If your results are different from those presented here, you should replace them.

How to Replace a Fridge Thermostat

  1. Unplug your refrigerator from the wall outlet.
  2. Locate the thermostat using the owner’s manual for your refrigerator. Fridges/freezers are usually located at the back, while it is more common for under/over units to locate underneath the fridge.
  3. You can remove the protective panel covering the thermostat by unscrewing the screws or removing the retaining clips using a screwdriver. Put the cover aside.
  4. Use a pair of needle-nose pliers to gently remove the wire connectors from the pin terminals or spade. Next, loosen the clip or mounting screw that holds in place and slide out of the evaporator tube.
  5. Attach the new thermostat to your evaporator tube and the connecting wires to the terminals. Recover the panel cover, then plug the refrigerator in. To test the operation, adjust the temperature dial in the refrigerator.

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How Do I Know If My Fridge Thermostat is Working?

The fridge is getting unusually cold. Your thermostat may malfunction if you see frozen food in other compartments. If this happens, you should hire refrigeration repair near Sydney to fix it.

How Do I Test My Fridge Freezer Thermostat?

There are a few ways to test your fridge freezer thermostat to see if it is working properly. One way is to use a multimeter to test the continuity of the thermostat.

Another way is to put a piece of ice in the freezer compartment and see how long it takes for the ice to melt. If the thermostat is working properly, the ice should take longer to melt than if the thermostat is not working properly.

How To Test Defrost Thermostat With The Multimeter?

Your multitester should be set to R X 1 Ohms. Each multitester’s lead should be placed on a wire. If your thermostat is cold, your multitester should read zero. If your thermostat is warm ( between forty and ninety degrees Fahrenheit), this test should give you a zero reading.

What Happens When The Refrigerator Defrosts The Thermostat Goes Bad?

Failing to defrost heater termination can cause the heater to stop heating or a buildup of solid frost on the evaporator coil. This could lead to too high temperatures. The thermostat contacts are usually closed and maintain continuity until the temperature reaches 140 degrees.

Can You Fix A Fridge Thermostat?

A simple hand tool can be used to replace the thermostat of a refrigerator. This is much cheaper than a call to a technician and a new refrigerator.

How Do You Test The Defrost Timer On A Refrigerator?

To test your refrigerator defrost thermostat, first disconnect the appliance’s power supply by unplugging it from the wall.

What Do The Numbers On A Defrost Thermostat Mean?

The numbers on a defrost thermostat indicate the temperature at which the thermostat will turn on the defrost cycle. The lower the number, the sooner the defrost cycle will start.

For example, if the thermostat is set to “5,” the defrost cycle will start when the temperature inside the refrigerator reaches 5 degrees Fahrenheit.


The most important thing you can do before buying a refrigerator is to test it. After reading this article, you will most likely find all the tools and conditions necessary to test the refrigerator defrost.

You can ask any questions in the comments section. Publican Anker will answer your questions and add reviews to the article. Thank you for reading this post.

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