A refrigerator is a home appliance that is used for storing food and can be rendered useless if it has a faulty thermistor. This is a small but very important part of your fridge that controls the temperature of your fridge. If you are having problems with temperature, then the thermistor is likely to be the culprit. Fortunately, testing and replacing it is not a complicated process and does not need the assistance of a professional. In this guide, you will learn how to test and replace your refrigerator thermistor in a few easy steps, which will help you save money on repairs and improve the performance of your appliance.
How to Test a Refrigerator Thermistor
Here’s a step-by-step guide to help you test your refrigerator thermistor.
Step 1: Unplug the Refrigerator
Before starting any repairs or testing, always unplug the refrigerator to prevent electrical hazards. Safety should be your top priority.
Step 2: Locate the Thermistor
The thermistor is usually located near the air ducts or evaporator coils inside the refrigerator. The exact location varies by model, so consult your refrigerator’s user manual for specific guidance. Typically, it can be found behind an access panel on the back wall of the fridge or freezer compartment.
Step 3: Disconnect the Thermistor
Once you’ve found the thermistor, carefully disconnect it from the refrigerator’s wiring. The clips or screws holding it in place may need to be removed. Gently disconnect the thermistor from the wire harness to avoid causing any damage.
Step 4: Measure the Resistance with a Multimeter
Now, it’s time to test the thermistor. Attach the multimeter probes to the terminals of the thermistor after setting your multimeter to measure resistance (ohms). A functional thermistor should show a resistance value that changes with temperature.
- At room temperature (around 70°F/21°C): The resistance should typically be between 8K ohms and 12K ohms.
- In cold temperatures (around 32°F/0°C): The resistance should increase, usually around 20K ohms when placed in ice water or cold surroundings.
- In warm temperatures (around 100°F/38°C): The resistance should decrease when exposed to heat.
Compare the reading with the manufacturer’s specifications for your specific refrigerator model. If the resistance is out of range or shows no change, the thermistor is likely faulty and needs replacing.
Step 5: Inspect the Wiring
Check for corrosion or damage to the wires and connectors while the thermistor is disconnected. Faulty wiring can lead to similar temperature regulation issues, so be sure to check for any visible problems.
How to Replace a Refrigerator Thermistor
The next step is to replace the thermistor if your testing findings show that it is defective. Here’s how to replace the thermistor in your refrigerator:
Step 1: Purchase a Replacement Thermistor
Before proceeding with the replacement, ensure that you buy a thermistor compatible with your refrigerator model. Check the specifications of the original thermistor, including its resistance value, size, and connector type, to ensure a proper fit.
Step 2: Remove the Old Thermistor
If you haven’t already done so during the testing process, disconnect the faulty thermistor from the refrigerator’s wiring. This may involve removing screws or clips that secure it in place. To ensure a proper installation of the new thermistor, take note of the thermistor’s location and wire configuration.
Step 3: Install the New Thermistor
Position the new thermistor in the same location as the old one. Secure it with screws or clips as necessary. Once it’s in place, reconnect the wiring to the thermistor. Make sure the connections are tight and secure to avoid any future issues.
Step 4: Test the Refrigerator
After the new thermistor has been fitted, reconnect the refrigerator to the power outlet and let it operate for several hours. Use a refrigerator thermometer to check the inside temperature to make sure that the fridge is functioning correctly and the temperature is steady. If all is well, then the replacement was successful.
Testing and replacing a refrigerator thermistor is a simple process that can restore your fridge’s functionality without professional help. Following the instructions will ensure that your refrigerator operates effectively, saving you both time and money. See the instruction manual or seek advice from a qualified technician if you’re unsure.
Written by Allen Rode for HnKParts, a trusted provider of high-quality appliance parts, offering a wide range of replacement components for Refrigerator, Dishwashers, and more.
Very informative content