The thermostat is the “brain” of the refrigerator, responsible for maintaining the set temperature. Not only food freshness, but also energy consumption, noise level and even the service life of the compressor depend on its correct setting. However, many users have been using equipment at factory settings for years, not realizing that they can (and should!) be adjusted to suit their needs.
In this article we will understand how the thermostat works in different types of refrigerators - from mechanical “knobs” to modern electronic panels. You will learn what temperatures are considered optimal for the refrigerator and freezer compartments, how to avoid common mistakes when adjusting, and what to do if the thermostat fails. And for those who love accuracy, we have prepared a table of recommended modes for popular models Atlant, Samsung, Indesit and other brands.
How a thermostat works and why it needs to be adjusted
A thermostat (or thermostat) is a sensor that constantly measures the temperature inside the refrigerator compartment and sends signals to the compressor to turn on or off. In mechanical models, the role of the regulator is performed bellows tube with gas, which expands or contracts when the temperature changes. In electronic refrigerators, this is responsible for thermistor a semiconductor element that changes resistance depending on the heat.
Why even touch the factory settings? Here are three good reasons:
- 📉 Energy savings. If the thermostat is set to too low a temperature, the compressor runs almost non-stop, increasing energy consumption by 15–30%.
- 🥦 Product safety. Some fruits and vegetables spoil at temperatures below +4°C, while meat and fish require colder temperatures. There are no universal settings!
- ❄️ Icing prevention. In models with a drip defrosting system, an incorrect mode leads to ice buildup on the back wall.
At the same time in 80% of cases, users mistakenly believe that the numbers on the regulator (for example, from 1 to 7) indicate degrees Celsius. In fact, these are conditional positions, where “1” is the warmest and “7” is the coldest. The correspondence of these numbers to the actual temperature depends on the model of the refrigerator and external conditions (for example, the temperature in the kitchen).
Optimal temperatures for the refrigerator and freezer compartments
Before turning the regulator, you need understand what temperatures are considered normal for different zones of the refrigerator. Here are the recommendations from manufacturers and sanitary stations:
| Refrigerator area | Recommended temperature | What to store | What will happen if the regime is violated |
|---|---|---|---|
| Refrigerator compartment (main compartment) | +2…+5°C | Dairy products, ready meals, sauces, drinks | At +6°C and above: rapid growth of bacteria. At 0...+1°C: freezing of vegetables and herbs |
| Freshness zone (zero chamber) | 0…+1°C | Meat, fish, cheeses, sausages, fresh herbs | At +2°C and above: reducing the shelf life of meat to 2-3 days. At –1°C: freezing of products |
| Freezer compartment | –18…–24°C | Frozen foods, semi-finished products, berries | At –15°C and above: defrosting. At –30°C: excessive load on the compressor |
| Refrigerator door | +5…+8°C | Eggs, butter, ketchup, medicines | At +10°C: milk sours in 12 hours. At +1°C: freezing of bottled water |
Important: these values are relevant for full refrigerator. If the chamber is almost empty, the temperature will fluctuate more due to the lack of “thermal inertia” from the products. In this case, you can lower the setting by 1-2 divisions.
⚠️ Attention! In refrigerators with a system No Frost the temperature in the freezer can automatically drop to -26...-30°C when first turned on or after defrosting. This is normal - after 6-12 hours the mode will stabilize.
Step-by-step instructions: how to adjust the thermostat
The adjustment process depends on the type of thermostat. Let's consider both options.
Mechanical thermostat (knob)
Such a regulator looks like a round switch with numbers (usually from 1 to 7) or inscriptions Min–Max. To change the temperature:
- Determine the current setting. If the refrigerator is new, it usually has an average value (3–4).
- Turn the dial one notch in the desired direction:
- 🔹 Clockwise - increase the cold (the number will increase, for example, from 3 to 4).
- 🔸 Counterclockwise - reduce the cold (the number will decrease, for example, from 4 to 3).
If, after changing the setting, the refrigerator begins to work too noisily or does not turn off at all, return the regulator to its original position - perhaps you have selected extreme mode.
Make sure that the door closes tightly|
Clean the seal from dirt|
Check if the freezer is not overloaded|
Measure the temperature in the room (should be +16...+32°C)|
Disable the mode “Super freezing” (if available)-->
Electronic thermostat (display or buttons)
In refrigerators with electronic control (for example, Samsung RB37J5230, LG GA-B489YGQZ), the temperature is adjusted more precisely - in steps of 1°C. The interface may differ, but the general logic is as follows:
- Find the button
Temp,FridgeorFreezer(sometimes it is combined with the display). - Press it once - the current temperature of the refrigerator will flash on the screen camera.
- Use the
+/–buttons (or arrows) to set the desired value (for example, +4°C). - Press
Tempagain to go to the freezer setting (if necessary). - Confirm the changes with the button
OKor wait for automatic saving (after 5-10 seconds).
Some models (for example, Bosch KAN92VI30R) have separate buttons for Super Cooling (intensive cooling) and Holiday (vacation mode). Their settings do not affect the main thermostat, but may temporarily change the temperature.
Typical errors when adjusting the thermostat
Even experienced users sometimes make mistakes that lead to product damage or breakdowns. Here are the most common:
- ❄️ Setting the maximum cold “just in case”. Mode
Maxor “7” is needed only for quick freezing (no longer than 24 hours). Constant operation at the limit wears out the compressor. - 🌡️ Ignoring external temperature. If the kitchen is hotter than +30°C, it is more difficult for the refrigerator to maintain +4°C inside. In this case, the regulator can be increased by 1 division.
- 🚪 Frequent opening of the door. Every time you look into the refrigerator, the temperature inside rises by 2-3°C. The thermostat has to turn on the compressor more often.
- 🍎 Storing the “wrong” products in the freshness zone. Bananas, cucumbers and tomatoes do not like temperatures below +8°C - they lose their taste and rot faster.
Another common problem is uneven cooling. If the top shelves are warmer than the bottom shelves, it's not always the thermostat's fault. The ventilation duct may be clogged (in models with No Frost) or the refrigerator is too close to the wall.
⚠️ Attention! If, after changing the thermostat settings, the refrigerator does not turn off for more than a day, and the temperature in the chamber is below -25°C, this is a sign thermostat failure. Immediately return the regulator to position “0” (or turn off the refrigerator) and call a technician. Working in this mode can lead to freezing of the evaporator and failure of the compressor.
How to check if the thermostat is working
If the refrigerator does not freeze well or, conversely, does not turn off, first You need to check the thermostat. Here is a simple test for mechanical models:
- Unplug the refrigerator.
- Remove the thermostat protective cover (usually it is located inside the chamber, next to the light bulb).
- Locate the two wires going to the thermostat and carefully disconnect them.
- Close the wires together (for example, with a paper clip).
- Plug in the refrigerator. If the compressor works, the thermostat is faulty.
For electronic thermostats you will need a multimeter:
- Disconnect the refrigerator.
- Remove the control panel and find the thermistor (usually a small plastic sensor with two wires).
- Measure its resistance at room temperature (should be about 5-10 kOhm).
- Place the sensor in a glass of cold water and measure the resistance again - it should increase.
If the resistance does not change or is zero/infinity, the thermistor is faulty.
What to do if the thermostat broken?
If the test confirms that the thermostat is faulty, it needs to be replaced. In mechanical refrigerators (for example Birusa or Nord) you can do this yourself - just buy a similar model (the part number is indicated on the thermostat body) and connect it according to the same circuit. In electronic refrigerators (for example Samsung or LG), replacement requires a soldering iron and knowledge of circuit design - it is better to contact a service center.
The cost of a new thermostat: from 800 rubles (mechanical) to 3,500 rubles (electronic with sensors).
Features of adjustment in refrigerators of different brands
Manufacturers use different approaches to temperature control. Here's what you need to know about popular brands:
- 🔧 Atlant and Biryusa. Most models have a mechanical thermostat with a scale from 1 to 7. The optimal position is 3 (for the refrigerator) and 5 (for the freezer). In two-compressor refrigerators, the settings are independent.
- 📱 Samsung i LG. Electronic control with touch buttons. There are modes
Power Cool(fast cooling) andFridge ShowCase(separate zone for frequently used products). The temperature can be set separately for each chamber in 1°C increments. - ❄️ Indesit and Ariston. In budget models, combined controls are often found: a mechanical knob for the refrigerator compartment and an electronic panel for the freezer. The mode
Super Frostis turned on by a separate button. - 🌿 Liebert and Bosch. Premium models are equipped with a system
VitaFreshwith automatic humidity control. Here the thermostat is adjusted through the menu on the display, and some parameters are blocked to prevent errors.
In refrigerators with two compressors (for example, Samsung RB30J3000WW), the thermostats operate independently. This means that you can turn off the freezer compartment, leaving only the refrigerator working, or vice versa.
⚠️ Attention! In some models LG and Samsung after changing the temperature, a message appears on the displayCoolorFreeze. This is not an error, but an indication of active cooling. After 1-2 hours, the inscription will disappear.
When adjusting the thermostat does not help
Sometimes temperature problems are not related to the thermostat. Here are cases when diagnostics of other nodes is needed:
- 🔌 The refrigerator does not turn on at all → Check the surge protector, plug and socket. The start relay or compressor may be damaged.
- ❄️ The freezer is working, but the refrigerator is not → The capillary tube is clogged or freon leaks. Refilling is required.
- 💨 The compressor runs non-stop, but does not freeze → There may be problems with the condenser (dirty or damaged) or the fan (in models with No Frost).
- 🌡️ The temperature fluctuates chaotically → The temperature sensor or control board is faulty. Diagnostics is needed.
If the refrigerator is old (10 years or more), problems with thermoregulation may be caused wear of the door sealIt’s easy to check: place a sheet of paper between. door and body and close the refrigerator. If the sheet is easily pulled out, the seal needs to be replaced.
FAQ: Frequently asked questions about adjusting the thermostat
Is it possible to set different temperatures in the refrigerator and freezer compartments?
Yes, in most modern refrigerators (especially with two compressors) the settings are independent. In mechanical models, usually one “knob” controls both. chambers, but there are exceptions - for example, Atlant MXM-1808 separate regulators for the freezer and refrigerator compartment.
Why did the refrigerator become louder after adjusting the thermostat?
This is normal if you increased the cold (turned the control clockwise). The compressor now runs longer to maintain a low temperature. The noise should decrease after 12-24 hours when the mode stabilizes. If loud operation continues, check if the refrigerator is touching the walls or furniture (vibration increases the noise). How often should you check and adjust the thermostat?
How often should the thermostat be checked and adjusted?
Ideally - 2 times a year: before summer and before winter. In summer, due to the heat in the kitchen, it is more difficult for the refrigerator to maintain cold, so you can increase the setting by 1 notch. In winter (if the kitchen is cool), it is better to lower the temperature so as not to overload the compressor. Also check the settings after long power outages - some refrigerators reset the settings.
Is it possible to completely turn off the thermostat?
Technically, yes - if you turn the knob to position “0” or Off. But this is equivalent to turning off the refrigerator: the compressor will stop working and the food will defrost. In some models (for example, Liebertthere is a mode Holiday - it turns off the refrigerator compartment, but leaves the freezer on. This is convenient if you. you are leaving for a long time.
What to do if the thermostat is stuck and you can’t turn it?
Do not force it! First try to gently swing the regulator left and right. If this does not help, unplug the refrigerator and remove the thermostat handle (it is usually attached to a latch or screw). dirt and dust with an alcohol wipe. If after this the thermostat does not turn, it needs to be replaced.