How to Test a Refrigerator Thermostat The Ultimate Guide

Did you know that whenever the thermostat on a fridge stops operating, the entire unit could stop working properly? To maintain the temperature cool, the thermostat regulates the compressor. If you don’t, it could malfunction, and your fresh items may get ruined.

I am sure you know that the fridge is one of the most prevalent household items. Refrigerators are popular because of the freshness they preserve, as well as the chilling effect they provide on hot days. Regrettably, most of us are eager to call for a professional when our fridge breaks down, even before trying to diagnose the issue. In this blog article, I will list several indicators that your refrigerator’s thermostat is broken, as well as some DIY techniques to help you fix it.

What is the Use of a Thermostat

A thermostat is an electrical element that controls the temperature of a fridge. Have any of you ever left your fridge open all night only to discover the contents to be either extremely chilly or exactly as you left them?

These are among the warning indications that your refrigerator’s thermostat is broken. The thermostat allows you to select the optimum temperature for the items you want to preserve using the settings, based on what you want to keep.

How to Find Out if Your Refrigerator Thermostat is not Working

The thermostat is a temperature-controlling component of the fridge. Consequently, a malfunctioning thermostat may cause poor refrigerator efficiency.

Not Cool Enough

The thermostat is used to control the temperature so that food and beverages can be chilled. Reset the refrigerator thermostat by increasing it a degree if goods don’t appear to be as chilled as they should be. After that, it should turn on or restart. However, if it does not, there might be a technical issue. Before altering the thermostat, disconnect the machine to properly reset the unit. If this doesn’t work, call a refrigerator repair specialist who specializes in your refrigerator’s type.

Too Cold

A malfunctioning thermostat might be the cause of food freezing within the fridge or its compartments. To test the thermostat, use an appliance thermometer or raise the temperature a degree or two. After that, wait a day to see if the food has defrosted. Nevertheless, this issue frequently necessitates the assistance of a repair professional as well as the replacement of your old thermostat.


The ideal fridge temperature is between 30 degrees Fahrenheit to 40 degrees Fahrenheit, but even small temperature changes can ruin foodstuff and enable disease-causing bacteria to thrive. As per the US Food and Drug Administration, perishable food should be kept at or below 40°F in the fridge to keep it cold and nutritious.

The equipment handbook will provide more data on acceptable temperatures. If you want to monitor the temperature of the fridge on a regular basis, avoid using a glass thermometer since it will be damaged by the coldness.

Step by Step Guide to Test a Refrigerator Thermostat

Regardless of the fact that testing a refrigerator thermostat is simple, many individuals are unaware of how to do it. This comprehensive guide can assist you in troubleshooting thermostat issues before hiring a mechanic or purchasing a new replacement.

Step 1: Check

Ever pondered how to test a refrigerator thermostat? The first step is to check the temperature control on the thermostat. If you notice that having the best refrigerator, all of the food you put in it freezes, double-check that the temperature is not preset too high. If the thermostat is adjusted too low, spotting might occur owing to excessive temperatures.

Step 2: Access

If the control appears to be in good working order, the next step in how to test a fridge thermostat is to approach it for an inspection. Before you do anything else, make absolutely sure the appliance is unplugged from the power source.

To make room for accessibility, empty the fridge of its items. Find the thermostat concealed under a plastic cover with a dial knob for unlocking using a flashlight to reveal the dark interior while the lights are turned off. To access the thermostat’s wiring, remove the dial and cover.

Step 3: Check the Readings

Do you feel like using a multimeter to test a refrigerator thermostat is rocket science? If you don’t know how to go about it, it may seem that way. Interestingly, it’s a simple process that starts with the coolest setting. After that, disconnect the thermostat from the fridge by unplugging the two lead wires.

Insert the probes on each of the thermostat connections after setting the multimeter to RX1. What are the numbers on the screen? If the value is zero, your thermostat may need to be replaced.

Step 4: Verify

Regardless of the fact that the multimeter reads zero, there’s a possibility your thermostat is still working. That implies you may do a verification that necessitates the use of a working refrigerator. Remove the thermostat and turn the heat up to the highest setting.

Mount it in a fault-free refrigerator and operate it for about half an hour before repeating ‘Step 3’ and taking the readings with a multimeter. One can grin realizing that the reading is still working if it indicates an infinite value. If the reading is zero, though, you must purchase a new one to replace it. If the thermostat is working properly, replace it and look for other probable causes of the refrigerator problem.

In conclusion, most people do not understand how to test a fridge thermostat to determine whether it is the source of the issue. Despite the fact that it is a common cause of temperature difficulties. Nonetheless, implementing the procedures outlined above can help you determine if you need to replace it or if the problem is somewhere else, in which instance you should contact a specialist. I hope you found this article helpful! Let me know your thoughts and queries in the comments section below!