The situation when the freezer in the refrigerator does not work can take any owner of household appliances by surprise. The freezer stores food supplies for weeks, and sudden defrosting of meat, fish or semi-finished products becomes a real disaster. Often the problem is not detected immediately: you open the door to take out a package of dumplings, and a puddle has already formed there, or, conversely, the products are covered with frost, but remain soft.
Initial panic is understandable, but to effectively solve the problem it is necessary to assess the scale of the disaster. Failure can be caused by either a trivial power failure or a serious one breakdown compressor or refrigerant leak. Understanding the physics of the cooling process will help you quickly diagnose the cause and decide whether you can handle it yourself or have to call a technician.
In this article we will analyze in detail all possible scenarios for failure of the freezer compartment. We will look at the design of the No Frost and drip defrosting systems, explain how sensors and thermostats work, and give a clear algorithm of actions when heat is detected instead of cold. It is critically important not to try to turn on the device many times in a row if you hear clicks or buzzing without starting the motor.as this can completely destroy an expensive unit.
⚠️ Attention: If you smell a strong chemical smell or see oily stains under the refrigerator, immediately unplug the appliance and ensure the room is ventilated. This may indicate a refrigerant leak along with compressor oil.
Primary diagnostics: what to check before calling a technician
Before disassembling the back panel or looking for a service center phone number, it is worth eliminating basic operating errors. Often the reason that freezer stopped freezing lies in little things that are easy to fix with your own hands. Checking these points will take no more than 15 minutes, but can save a significant amount on diagnostics.
First of all, make sure that the refrigerator is tightly closed. If the freezer door is not fully pressed against the body, warm air constantly flows inside. The cooling system is working hard, trying to compensate for the heat gain, but does not have time to maintain the desired temperature. This happens especially often if the rubber seal is dirty or deformed.
It is also worth checking the operating mode. Perhaps one of the household members accidentally activated the “Vacation” or “Super Freeze” function (which sometimes works with a shutdown timer), or the settings in the electronic control module were lost. In some models electronics may fail after power surges in the network.
- 🔌 Check whether the plug is tightly inserted into the socket and whether there is voltage in the socket itself (connect a lamp or hair dryer there).
- ❄️ Make sure that the temperature is set correctly: for a freezer, the normal range is from -18°C to -24°C.
- 🚪 Inspect the seal around the perimeter of the door: it should be clean, elastic and fit tightly to the metal.
- 🧊 Check that they are not blocked Are the ventilation holes inside the chamber filled with food.
Problems with the No Frost system: ice and fan
If your refrigerator is equipped with a system No Frost (without frost), then the lack of cold is often associated with impaired air circulation. In such models, the cold is generated in a separate evaporator, hidden behind the rear wall, and is forced into the chambers by a fan. If this air flow is blocked, the freezer ceases to perform its function, even if the compressor hums properly.
One of the most common reasons is the formation of a “snow coat” on the evaporator. This occurs when the automatic defrost system malfunctions. The evaporator heating element, timer or defrost sensor stops working correctly, and ice builds up in layers, completely blocking the air channels. As a result, the fan hums, but cold air simply cannot enter the freezer.
You can diagnose this problem by listening to the operation of the appliance. If you hear the noise of a running fan, but no cold air is blowing from inside, or the fan does not make noise at all, although the compressor is running, the problem is the circulation. Sometimes the fan blades can freeze to the ice or touch ice, which causes a characteristic crackling sound.
For a temporary solution, you can completely defrost the refrigerator. Unplug the appliance, open the doors and leave it for at least 24 hours (preferably two days). This will allow the ice to completely melt. If, after turning on, the freezer starts working normally again, but after 1-2 weeks the problem recurs, it means that the elements of the defrosting system need to be replaced.
⚠️ Attention: Never try to break off the ice with a knife or other sharp objects! You can puncture the evaporator passages through which freon circulates. Repairing such damage is often unprofitable or impossible.
Malfunctions of the compressor and start relay
Compressor are the heart of the refrigerator, its motor, which drives the refrigerant through the system. If it doesn't work, there won't be any cold anywhere. However, the lack of cold does not always mean the death of the compressor. Sometimes the problem lies in the starting relay - a small device that supplies a starting pulse to the motor windings.
Symptoms of a malfunction of the starting relay or the compressor itself are quite specific. You can hear the refrigerator trying to turn on: there is a characteristic click, the motor hums for a few seconds, then another click and silence. This phenomenon is called “thermal protection”: the motor tries to start, cannot, overheats, and the thermal relay opens the circuit to prevent a fire.
The reasons for this behavior can be different:
1. Interturn short circuit in the compressor windings (motor replacement required).
2. Jamming of the piston group (motor replacement required).
3. Failure of the starting relay (the relay needs to be replaced, which is inexpensive).
4. Problems with the wiring or control module.
If the compressor is hot to the touch, but does not start, or it is cold and silent, although the light inside is on, these are different diagnoses. In the first case, there is a high probability of problems with the electrical part of the motor or relay. In the second, perhaps the start signal does not come from the “brains” of the refrigerator.
- 🔊 A clicking and buzzing followed by attenuation is a sign of problems with starting the motor or relay.
- 🔥 Strong heating of the compressor housing when the refrigerator is not working is a bad sign, indicating an overload.
- 🔇 Complete silence and a cold compressor may indicate a lack of power or an electronic malfunction.
☑️ Compressor diagnostics
Leakage freon: signs and consequences
Freon (refrigerant) is a working fluid that transfers heat from the refrigerator chambers to the outside. In a working system, it circulates in a closed loop for years. However, if a microcrack forms in the tubes or heat exchangers, the gas begins to escape. Without a sufficient amount of freon, the refrigerator will not be able to freeze, even if the compressor is working properly.
The insidiousness of a leak is that it often occurs gradually. At first, you may notice that the freezer has become worse at freezing, or the compressor cycle has increased (it runs longer and turns off less often). Then the products begin to thaw, and instead of uniform frost, “bald spots” appear on the walls of the chamber, or ice grows only in the corners.
Often a leak occurs in the foamed part of the housing (in the heat-insulating layer), where the evaporator tubes are located. This may be caused by metal corrosion from moisture or mechanical damage during transportation. In such cases, it is impossible to visually find the hole.
One of the simplest ways to initially check is to inspect the condenser (the grille at the back of the refrigerator). Normally, it should be warm evenly over the entire area. If you touch the grill and find that only part of it is warm (for example, a third or half), and the rest is cold, this is a sure sign lack of refrigerant.
⚠️ Attention: Filling the refrigerator with freon is not just “adding gas.” First, the technician must find the leak, fix it (solder the tube or replace the evaporator), evacuate the system (remove air and moisture) and only then charge the exact amount of refrigerant. Simply adding gas without repair is a temporary measure for a couple of weeks.
Failure of electronics and temperature sensors
Modern refrigerators, especially brands LG, Samsung, Bosch, Indesit, are crammed with electronics. Temperature is monitored by sensors (thermistors), which constantly send signals to the control module. If the sensor “lies”, showing that the chamber is already -30°C, although there is +5°C, the “brain” of the refrigerator simply will not turn on the compressor.
Most often, the evaporator or air temperature sensors in the chamber fail. They can change their resistance due to aging, contact oxidation or voltage surges. On models with an electronic display on the door, an error is often indicated by flashing lights or letter codes (for example, F1, E5, Err).
Sensor diagnostics require a multimeter. The technician checks their resistance at different temperatures and compares the readings with reference values for a specific model. If the resistance is broken or is not normal, the sensor must be replaced. This is one of the most common and relatively inexpensive breakdowns.
The problem may also lie in the control module itself. A power surge could damage traces or board elements. In this case, the refrigerator may behave chaotically: turn on and off spontaneously, not respond to buttons, or show the wrong temperature.
Table: Comparison of symptoms and probable causes
To make it easier for you to navigate the variety of symptoms, we have compiled a summary table. It will help narrow down the troubleshooting before calling a specialist.
| Symptom | Probable cause | Difficulty of repair | Do you need a technician |
|---|---|---|---|
| The compressor is humming, clicks, but does not start | The starting relay is faulty or the motor is jammed | Low / High | Desirable (for motor diagnostics) |
| The refrigerator runs constantly without turning off | Freon leak or clogged capillary | High | Yes, definitely |
| The freezer is warm, but the fan is noisy | Icing of the evaporator (No Frost) | Average | Yes (replacement of the heating element/sensor) |
| The refrigerator is silent, the light is on | Thermostat or control module is faulty | Average | Yes |
| Uneven cold, food thaws | Partial leakage of freon | High | Yes |
When a professional is needed repair
There is a fine line between DIY repairs and the need to call a specialist. If, after defrosting for 24 hours and checking the socket, the refrigerator does not start to freeze, further independent actions may be useless or dangerous. Repairing refrigeration equipment requires specific tools: a pressure gauge station, a vacuum pump, a leak detector and a burner.
It is especially important to contact a professional if you need to work with refrigerant. Freon is not just a gas, it is a chemical substance, working with which requires a license and compliance with safety regulations. In addition, different models are charged with different brands of freon (R134a, R600a) in strictly defined quantities. An error in grams will lead to incorrect operation.
A technician is also needed if there is a suspicion that the capillary tube is clogged. This is the thinnest tube where the refrigerant is throttled. It can become clogged with oil oxidation products or moisture. It is impossible to clean it at home; you need to blow it with nitrogen under high pressure and replace the filter-drier.
You should not ignore the problem and hope for “maybe.” An idling compressor will quickly burn out if freon leaks. A dirty condenser (clogged with dust at the back) leads to overheating and failure of expensive components. Timely diagnostics extend the life of the appliance by years.
Why does the freezer freeze, but the refrigerator does not?
This is a classic symptom of a malfunction of the No Frost system or problems with the air supply damper. In two-chamber models, the cold is often generated in the freezer and supplied to the refrigerator compartment through a duct. If the damper is stuck in the closed position or the channel is clogged with ice/products, the cold will not flow. It is also possible that the evaporator freezes, which blocks the air flow.
Is it possible to operate the refrigerator if it does not freeze?
For a short time - it is possible if you are waiting for a technician or doing defrosting. Long-term operation with a malfunction (especially a freon leak or a non-working fan) will lead to overload and burnout of the compressor. If the compressor runs constantly without stopping, there is a risk of fire and guaranteed motor breakdown.
How to check if the thermostat is working?
In mechanical models, you can close the thermostat contacts directly (after disconnecting the refrigerator from the network!). If the compressor starts working after switching on, the thermostat is faulty. In electronic models, checking is possible only with a multimeter by measuring the resistance when the temperature changes.
What to do if a coat of ice has formed in the freezer?
You need to completely defrost the refrigerator (at least 24 hours). If, after switching on, the ice builds up again within 1-2 weeks, it means that the defrosting system is broken (the heating element, timer or sensor has burned out). The faulty element needs to be replaced. You can use a hairdryer to speed up defrosting, but be careful not to melt the plastic.
Why did the refrigerator turn on after defrosting, but after a week it stopped freezing again?
This indicates that defrosting only eliminated the effect (ice jam), but not the cause. The reason lies in a malfunction of the defrost system components (in No Frost models) or in the beginning of a freon leak. The ice blocked the channels again or the freon escaped through a microcrack again.