Updated at: 27-09-2022 - By: cnbusinessnews

Do you know how to use a multimeter to check the temperature in a refrigerator? With a few simple steps, you’ll be able to do it! Connect the probes of your multimeter to the negative and positive terminals of the thermostat and record the reading.

You may wonder why your fridge’s temperature suddenly rises and cools down. Or perhaps it’s extremely cool, or the polar opposite.

You might be perplexed as to why the temperature in your refrigerator fluctuates so drastically. Or, it could be extremely cool or the complete opposite.

What is a Refrigerator Thermostat?

Refrigerator thermostats control the temperature of a refrigerator’s cooling system, which makes them a crucial component. In more modern appliances, it may appear as a digital readout or as a dial that indicates how cold the appliance’s inside is and allows the user to adjust the temperature accordingly. The compressor and main cooling system are controlled by the thermostat, which does not directly alter the temperature. Instead, it communicates the ideal and intended temperature settings to the compressor and main cooling system. Rather than making the air colder, these technologies remove heat from the refrigerator compartments. During this process, the thermostat functions as a regulator and plays a crucial part in determining when air movement begins or ends.

How to Test a Refrigerator Thermostat: The Ultimate Guide - Kitchen Rank

Usage Basics

With a knob or control panel, users can regulate thermostats that are commonly found inside refrigerators. A common feature in modern versions is the ability to set different temperatures in various parts of the appliance. For example, the main chamber can be kept cooler than one or more drawers. Once the target temperature is set, the thermostat monitors the system’s internal variations and controls the compressor to turn on or off as necessary to keep the temperature where it is. When the refrigerator temperature is correctly set, the thermostat shuts down the compressor, thereby halting it from cooling the appliance.

How the Whole System Works

The cooling system’s power plant is the compressor. A pump and motor are housed in a sealed container where the refrigerant travels, about the size of a football. Refrigerant is converted from a low-pressure gaseous state by the compressor to a high-pressure gas when the thermostat senses an excessive amount of heat.

Compressor gas travels to condenser, where it is transformed into a liquid that radiates heat. To regulate the pressure and flow, the liquid refrigerant is pumped through a capillary tube. A loss of pressure occurs as the liquid refrigerant enters the evaporator, where it is converted back to a gas. As a result, the temperature in the refrigerator is reduced as a result of this process.

Relationship to Defrost Thermostats

As a general rule of thumb, it’s necessary to distinguish between a refrigerator and defrost thermostat. Frozen water or frost that has accumulated inside most modern refrigerators can be melted away without the use of a specific appliance because most refrigerators defrost themselves automatically. Refrigerators, freezers, and other devices that operate at or near the freezing point frequently develop frost. Patches of ice can occur if the air is not circulated sufficiently swiftly or thoroughly.

Defrost timers built into thermostats switch off the refrigerator and activate a defrost heater when they detect frost on the inside of the unit. Any ice or frost that has accumulated on the cooling coils dissolves when the heater warms up. It is common for the defrost thermostat to be located near the cooling coils and to activate the defrost heater when it reaches a certain temperature.

Special Circumstances

External refrigerator thermostats can be utilized in a variety of circumstances, including those where precise temperature control is needed. These gadgets can be taken anywhere and are usually sold in a kit form. It is common practice to place a temperature control dial and a temperature probe inside a refrigerator, which then connects to an external thermostat. Observers can keep tabs on inside conditions thanks to a review panel located outside.

For people who wish to manage the temperature exactly without opening the doors, this type of setup is ideal because it naturally alters the temperature and introduces outside air. Those who brew beer and churn out cheese are the most likely buyers for this product. As soon as a product is finished, it’s kept in a refrigerator that’s not normally shared with other food or perishables.

What is the purpose of a thermostat in a refrigerator?

Refrigerator temperature is controlled by a thermostat, an electrical component. Leaving your refrigerator overnight and waking up to find that the contents are either unusually chilly or exactly as you left them is a common occurrence. These are a few of the warning indications that the thermostat in your refrigerator is malfunctioning. The thermostat’s controls let you tailor the temperature to the specific foods you’re preserving. When a freezer is left in a garage, the temperature set by the garage’s thermostat can have an impact on how well it works. The compressor will be shut off if you don’t have a garage-ready freezer, resulting in spoilage of your goods.

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How can you tell when the thermostat of a refrigerator is faulty?

A broken refrigerator thermostat is obvious even if you aren’t familiar with how to do the test. Listed here are some possible signs that the thermostat isn’t working properly.

  • The lack of cooling

If you have noted that your refrigerator is not sufficiently cooling foods as usual or the temperature is inappropriate, this could indicate a thermostat problem.

  • If you have noted that your refrigerator is not sufficiently cooling foods as usual or the temperature is inappropriate, this could indicate a thermostat problem.

It’s possible that a malfunctioning thermostat is to blame if your refrigerator isn’t keeping food as cool as it usually does or if the temperature is too high.

  • Temperature swings that are out of character

A refrigerator’s normal operating temperature range is between 320°F and 400°F. If the temperature in your refrigerator seems to be fluctuating erratically, it’s time to learn how to test a refrigerator thermostat.

The Role Of Thermostat On Your Fridge

It’s important to understand the role of a thermostat on a refrigerator before getting into testing. It’s a simple job, but it’s critical to the function of your fridge, which is to keep your food and beverages cool. That’s exactly right, thank you! It controls the temperature in a refrigerator.

Your food may rot or freeze if you don’t have it or if it doesn’t work well, wasting a lot of time and money.

This is also the person in charge of turning on and off the compressor in the refrigerator. The inside temperature of the refrigerator is detected by a sensor that is either incorporated into or linked to the device. A low enough temperature will cause the compressor to be turned off, but a rise in temperature will do the opposite.

Steps To Test A Fridge Thermostat With A Multimeter

Learning this task will save you a lot of money in the long run. In addition, if you believe that something is wrong with your refrigerator, you are less likely to call in an expert in this field on the spur of the moment.

On the other hand, a simple thermostat check could help you find the solution to your issue. For this task, you’ll need a good multimeter and some knowledge on how to use it. Using a multimeter, you will be able to determine how to test a fridge thermostat.

Step #1. Investigate the thermostat control

It’s possible that you mistakenly set your refrigerator’s thermostat to the lowest setting imaginable, causing the food inside to freeze. It could possibly be that the fridge defrosted since it was set to a high temperature mode. If you haven’t found anything wrong with the thermostat control setup after investigating, then that is unlikely to be the cause of the anomaly on your fridge. As a result, we can now go on to the next phase.

Step #2. Clear up the way to the fridge thermostat

The first step is to remove the fridge’s power line from the outlet. Do you really want to be electrocuted? Make sure your hands are dry before you unplug the device. To conclude, if your fridge’s performance is irregular, you should transfer all of your food to a working refrigerator. My guess is that we’d like to fix the fridge, but we’d also like to keep our supplies.

Since the impediments have been removed after cleaning out the fridge, you can easily access the thermostat now. However, when you shut down the fridge, the light inside will go out, obscuring your view of what’s within. As a result, a flashlight is recommended as a backup light source.

Once you’ve removed the plastic cover off the thermostat, you can now access the thermostat’s internals. The mode adjuster must first be removed from the majority of refrigerators before the covers can be successfully removed.

Step #3. Do the test

The first step is to turn the thermostat all the way down. Afterwards, attach the thermostat probes to the thermostat’s positive and negative wires or terminals. This mode requires a zero as the result. When the thermostat doesn’t follow this rule, there’s a problem with it.

To be on the safe side, the thermostat should show a reading of 0.

Let’s give it a whirl with the help of a working freezer this time around. It’s first necessary to disconnect the thermostat from the wall and place it in the freezer for half an hour on its warmest setting. Reconnect the probes to their appropriate partners with the multimeter and verify the reading. Infinity must be the meaning behind it. In this case, we can conclude that the thermostat is faulty.


What is the refrigerator thermostat for?

Your refrigerator’s temperature is controlled by a thermostat. It activates the refrigerator’s cooling system by turning on the compressor. The compressor is turned off when the temperature in the fridge drops below a certain level.

Everything inside would freeze if the compressor was constantly running. If something had frozen inside, you should raise the thermostat setting. Alternately, if the foodstuffs spoil too quickly, lower the temperature in the house.

Why my refrigerator thermostat failed?

A hole in the gas tubing could cause the thermostat to lose gas. When the temperature rises, the gas inside expands, and the thermostat activates the compressor. It would be impossible for the thermostat to turn on the compressor if there was no gas.

Another possibility is that the wiring is faulty. Corrosion of the thermostat’s contacts or wire damage are both possibilities. The contacts can be cleaned if you want to.

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How to check if the thermostat is malfunctioning?

The thermostat may be malfunctioning, causing the fridge to be too hot.

If the refrigerator is excessively cold, the thermostat does not turn off the compressor. In addition, a probable thermostat issue.

The temperature in the refrigerator is constantly fluctuating: The ideal temperature is between 32 and 40 degrees Fahrenheit. The thermostat is most likely to blame for extreme temperature swings.

How to check my thermostat?

Refrigerator circuit breakers should be checked to make sure they are working. Make sure the fuses in the refrigerator are not blown. If necessary, substitute. Check the power cord on the refrigerator.

If there are batteries in the thermostat, remove the lid and replace them.

And don’t forget to read your owner’s manual.

How to reset my refrigerator thermostat?

Disconnect the power cord from the refrigerator. The cooling system of the refrigerator may make a knocking noise, although this is normal. Refrigerators should be left disconnected for a while.

Controls for the freezer and fridge should be turned off (to OFF or to 0). Refrigerator: Turn on the power. Wait 24 hours after adjusting the thermostat to the desired temperature before turning it back on.

The refrigerator may need to be repaired if the temperature isn’t what you want it to be. Consult with an expert if you are unable to complete the task alone.

Final Words

By the time you’ve finished reading this, you should know how to use a multimeter to check the temperature in a refrigerator. This article was a labor of love, and I appreciate your time and attention. It’s a pleasure to work with you. Interested in learning more about the refrigerator? Continue reading to learn how much a compressor for a refrigerator costs. I appreciate your time and interest.