The question of which number on the thermostat means a lower temperature - zero or five - causes controversy among owners of refrigeration equipment. Intuitively, it seems that zero should be “less than,” but in the world of thermostats, the logic is often reversed. Understanding how your unit operates directly affects the freshness of your food and the life of your compressor.
There are two main types of temperature control: mechanical and electronic. In the first case, the numbers can mean either degrees Celsius or conditional cooling power. Electronic displays usually show the actual temperature, while mechanical rotary knobs they often work on the principle “the higher the number, the colder”. It is necessary to understand this immediately after purchase in order to avoid food spoilage.
In this article we will take a detailed look at how different control systems work, why the scales may differ between brands and how to correctly set the parameters for optimal storage. On most mechanical thermostats, a scale from 0 to 7 or 1 to 5 means the cooling power, where the maximum number corresponds to the minimum temperature inside the chamber. An incorrect setting can lead to the fact that the products deep in the chamber will freeze, and the compressor will work for wear.
The principle of operation of mechanical thermostats
A mechanical thermostat is a classic device that can be found in many models of refrigerators produced in past decades, as well as in budget lines of modern brands. Its operation is based on the physical expansion and contraction of the sensing element (bellows) with temperature changes. When you turn the knob, you mechanically change the spring force required to open the contacts.
In such devices, the number “0” or “Min” almost always means “off”. The compressor does not receive a start signal and cooling stops. If you turn the knob toward higher numbers, you increase the spring tension. This forces the thermostat to wait for a lower temperature inside the chamber before breaking the circuit and stopping the motor. Therefore, a larger number on the scale corresponds to a lower temperature inside the refrigerator.
⚠️ Attention: On older Soviet-made models or specific industrial refrigerators, the scale can be calibrated in degrees Celsius. In this case, number 5 will be warmer than 0. Always check the technical data sheet of the device.
Let's consider how to interpret the values on a standard scale from 1 to 5 or from 1 to 7:
- ❄️ Number 1 (or Min) is the minimum cooling power, the temperature in the chamber will be the highest (about +8...+10°C).
- ❄️ Number 3 (or the middle of the scale) - recommended mode for everyday use, providing about +4...+5°C.
- ❄️ Number 5 (or Max) - maximum cooling, the temperature can drop to 0°C and below, which threatens freezing vegetables.
Thus, if you are faced with a choice between setting the knob to 0 or 5, then position “5” will make the refrigerator much colder. Position "0" is simply off. It is important not to confuse these values with the actual temperature in degrees.
Electronic controls and digital displays
Modern refrigerators, such as Liebherr, Bosch or LG, are increasingly equipped with electronic control panels. Here the logic becomes more transparent to the user, as the actual values in degrees Celsius are displayed on the screen. In this context, the question “which is colder: 0 or 5” is solved mathematically: 0 degrees is colder than 5 degrees.
However, even in electronic systems there are nuances. Some models allow you to adjust the temperature "offset" or have modes like "Eco" or "Max Cool". In “Eco” mode, the system can automatically maintain a temperature of about +5...+6°C to save energy, while manually selecting “0” or “+1” will launch intensive cooling. Digital thermostat controls the compressor with high precision, allowing an error of no more than 0.5 degrees.
If the number 5 is on the display, this means that the system strives to maintain +5°C. If you set it to 0, the refrigerator will try to reach the freezing point of water. This can be useful for quickly cooling drinks, but is dangerous for long-term storage of dairy products, which can separate.
The difference in temperature perception also depends on the load of the chambers. An empty refrigerator set to +2°C will cool faster than a unit completely filled with food with the same settings. Electronics takes this into account more slowly than mechanics, relying on readings from air sensors rather than the evaporator.
Comparison of temperature conditions from different manufacturers
Not all manufacturers adhere to uniform labeling standards. This often confuses users who change from one brand of refrigerator to another. For example, in refrigerators Indesit and Ariston with mechanical control, a scale from 1 to 5 means an increase in cold. At the same time, some models Samsung may use different display logic in the service menus, although the user panel is usually standardized.
Below is a table showing how different positions of the regulator affect the temperature inside the main chamber (at an ambient temperature of +25°C):
| Position of the regulator | Approximate temperature (mechanics) | Compressor operating mode | Recommended products |
|---|---|---|---|
| 1 (Min) | +8...+10°C | Rare inclusions, short cycles | Fruits, vegetables, drinks |
| 3 (Average) | +4...+5°C | Standard duty cycle | Dairy products, ready meals, meat |
| 5 (Max) | 0...+2°C | Frequent starts, long cycles | Cooling large volumes of food, cooking meat |
| 0 (Off) | Temperature premises | Off | Storage is not required (defrosting) |
As can be seen from the table, the difference between position “1” and “5” can be up to 8 degrees, which is critical for biochemical processes in products. At a temperature of +8°C, bacteria multiply many times faster than at +4°C. Therefore, setting the regulator to “one” in the summer, when the kitchen is hot, can lead to rapid souring of the milk.
It is also important to take into account the seasonal factor. In winter, when the room is cool, even position “3” can give a temperature of about +2...+3°C. In the summer, with heat of +30°C, the same position may not be enough, and you will have to switch to “4” or “5”. Thermoregulator does not compensate for heat inflows indefinitely, its capabilities are limited by the power of the compressor.
Why may the refrigerator not turn on in winter?
In single-compressor models with mechanical control, the thermostat is located in the refrigeration chamber. If the room is cold (below +10°C), the thermostat “thinks” that it is already cold inside and does not turn on the motor. To work in an unheated room, you need a special winter kit or electronic control.
The influence of settings on the safety of products
The correct choice between “colder” and “warmer” is dictated not only by desire, but also by the type of product. The biological processes in different types of food require different conditions. An incorrect temperature setting (for example, “5” instead of “3”) can cause the lettuce leaves to turn into ice porridge, and the cottage cheese will lose moisture.
On the other hand, setting it to “1” or “2” on a hot day will create ideal conditions for the proliferation of pathogenic microflora. Risk zone for most bacteria it is in the range from +5°C to +60°C. The task of the refrigerator is to keep food below this zone, but above the freezing point of cell juice.
Particular attention should be paid to the storage of raw meat and fish. These products require the lowest temperatures, close to 0°C, but not lower. If your refrigerator does not have a separate “zero zone” (freshness zone), then setting the general thermostat to “4” or “5” may be justified, but only on the condition that you make sure that the food does not touch the back wall, where the evaporator.
- 🥛 Dairy products: optimal +2...+4°C (position 3-4 on the mechanics).
- 🥩 Raw meat and fish: optimal 0...+2°C (position 4-5, but short-term).
- 🍺 Drinks and sauces: acceptable +5...+8°C (position 1-2).
⚠️ Attention: Ready-made dishes with mayonnaise or eggs (salads) cannot be stored at temperatures above +4°C for more than 12 hours. Setting the thermostat to minimum (number 1) in the summer is deadly for such products.
How to correctly set the temperature yourself
Setting up a refrigerator is a process that requires supervision. You shouldn’t set it to maximum cold immediately after purchasing or defrosting. Let the unit come into operation. For mechanical thermostats, there is a “golden mean” - usually this is a division in the middle of the scale.
The setup process is as follows:
1. Set the knob to the middle value (usually 3).
2. Wait 6-8 hours (or a day for complete stabilization).
3. Place a household thermometer in a glass of water on the middle shelf.
4. After a few hours, check the readings.
If the thermometer shows +6°C or higher and the food is spoiling, add power (turn to 4 or 5). If the thermometer shows 0°C or the food is freezing, turn it down to 2. Remember that after each turn of the knob thermostat it takes time (from 30 minutes to several hours) to react and change the compressor operating cycle.
☑️ Checking the setting temperature
Do not forget that the location of the thermostat also affects its operation. On some models it is located in the corner of the top shelf. If you force this corner with jars, the thermostat will “think” that the refrigerator is already cold and will turn off the compressor ahead of time, leaving the rest of the food warm.
Frequent errors when operating refrigeration equipment
One of the most common mistakes is trying to quickly cool a hot pot of soup by turning the knob to “Max” (5 or 7). This will not only not speed up the process significantly, but will also force the compressor to work at its limit, which can lead to its failure. It is better to cool hot foods to room temperature first. overheating and failure. It is better to cool hot foods to room temperature first.
Another mistake is ignoring seasonality. Users forget to switch the thermostat knob from winter to summer mode. In winter, with open windows or low heating, position “5” can lead to complete icing of the evaporator and the “crying” rear wall, which turns into an icy shell. This disrupts air circulation.
An error in setting the temperature in an empty refrigerator is also common. An empty volume cools very quickly, and the thermostat (especially if it is an air thermostat) may turn off early. When loaded with warm products, the temperature will jump sharply, but the compressor will not turn on immediately due to the inertia of the thermostat. Heat capacity products play the role of a cold accumulator, stabilizing the temperature.
Remember that “0” on a mechanical handle is not zero degrees, but zero work. Do not leave the refrigerator in this position for a long time when storing food, even in winter, as the lack of air circulation can lead to the appearance of mold and odors.
What will happen if you constantly keep the refrigerator at maximum (5-7)?
Constantly operating at maximum power will lead to several negative consequences. Firstly, electricity consumption will increase significantly. Secondly, the compressor will operate with minimal or no pauses, which will shorten its life and may cause overheating of the windings. Thirdly, foods not intended for freezing (especially vegetables and fruits) will lose their structure and become watery and tasteless. A thick layer of ice forms on the back wall, which will have to be defrosted frequently.
Why is it 5 degrees in the refrigerator, but the thermostat is set to 3?
This is a normal situation for a working refrigerator. The number “3” on a mechanical handle is a conventional unit of power, not degrees. It is selected by the manufacturer so that under standard conditions (room temperature +25°C, average load) it provides just about +4...+5°C inside the chamber. If the number on the handle meant degrees, then when setting “3” it would be +3°C inside, which is also acceptable, but mechanical thermostats are calibrated precisely by the “feeling” of cold with a bellows.
Is it possible to use a thermometer for precise adjustment?
Yes, this is the most reliable way. Mechanical thermostats wear out over time, the spring weakens, and the numbers on the scale no longer correspond to reality. Once a year, it is recommended to place a special household thermometer (or a multimeter with a probe) in a glass of water on the middle shelf overnight. If in the morning the readings differ from the desired +4°C, adjust the position of the handle, focusing on the thermometer, and not on the numbers.