The situation when the refrigerator seems to be working, the compressor is humming, but one of the chambers (most often the freezer or, conversely, the refrigerator) ceases to perform its functions, causes panic in any home cook. Food begins to deteriorate, ice melts, and an unpleasant odor grows inside. This is a classic symptom of a malfunctioning refrigeration circuit or control system. In most cases, the problem lies not in a breakdown of the compressor itself, but in a refrigerant leak, a clogged capillary tube, or the failure of one of the sensors.
To understand whether it is worth calling a technician or whether the problem can be solved yourself, it is necessary to carry out an initial diagnosis. It is important to distinguish: the chamber does not freeze at all (the temperature is equal to room temperature) or it simply cools poorly. If you notice that it is warm, but everything in the freezer is frozen solid, or vice versa - the ice has melted in the freezer, and the food in the main chamber is barely warm, this indicates a specific range of malfunctions. Often the culprit is a violation of air circulation or a failure in the system refrigerator compartment warm, but everything in the freezer has frozen solid, or vice versa - the ice has melted in the freezer, but the food in the main chamber is barely warm, this indicates a specific range of malfunctions. Often the culprit is a lack of air circulation or a system failure. No Frost.
Do not rush to throw away spoiled products and look for a new unit. Modern technology, be it Indesit, Atlant or LG, is designed according to similar principles. Understanding the physics of the process will help you save time and money. Below we will analyze in detail all possible scenarios, from simple settings to complex technical breakdowns that require the intervention of a professional.
Primary diagnostics and simple causes
Before disassembling the back wall or looking for a service center, eliminate common operating errors. Often, users accidentally change settings or overload equipment, which leads to temperature violations. If one chamber is not freezing, check whether air access is blocked.
- ❄️ Check the thermostat settings - perhaps someone at home accidentally reset the temperature in one of the zones.
- 🚪 Make sure the door closes tightly and the rubber seal is not cracked or dirty.
- 📦 Do not place hot pots inside and do not fill the chamber with food to capacity - the air must circulate.
Particular attention should be paid to the ventilation system. In modern models with the system No Frost cold air is pumped from the freezer into the refrigerator through special channels. If these channels are clogged with food or ice, circulation stops. As a result, there may be “polar cold” in one part of the unit, and heat in another. Try to unload the chamber and check the air duct openings.
Another common reason is a loose door fit. If the seal (cuff) is contaminated with grease or deformed, warm air constantly flows inside. The compressor tries to compensate for heat loss and works without stopping, but due to an imbalance, one of the chambers may not have time to cool. Wipe the seal with a soft cloth and soapy water and check the seal.
Faults in the No Frost and defrosting system
The No Frost system (or “No Frost”) greatly simplifies life, eliminating the need to defrost the refrigerator manually. However, it is this that most often becomes the reason why one chamber stops freezing. The essence of the problem lies in the defrost cycle: the evaporator, which is located behind the rear wall, becomes overgrown with frost, which must periodically melt. If this process is disrupted, ice blocks the operation of the fan.
The key elements here are Defrost heating element, defrost thermostat and the timer (or electronic control module). If the heating element burns out or the thermostat does not close the circuit, the ice does not melt. Over time, the evaporator turns into an ice monolith. The fan, which is supposed to drive cold air into the chamber, becomes jammed with ice or simply cannot blow air through the ice plug. As a result: it is cold in the freezer (there is an evaporator), and in the refrigerator compartment it is warm.
⚠️ Attention: If you hear that the fan is humming, but no air flows, or you can hear the cracking of ice, this is correct a sign of a defrost problem. Operation in this mode can lead to burnout of the fan motor.
For diagnostics, complete defrosting of the unit is often required. Unplug the refrigerator, open the doors and leave it for at least 24 hours (preferably two days). This will allow the ice in the hidden channels to completely melt. If after turning on the problem disappeared for 1-2 weeks and then recurred, it means that one of the elements of the defrosting system is faulty.
How to check the defrosting heating element with a multimeter?
To check, you need to get to the heating element (usually it is located under the plastic panel on the back wall of the freezer). Test the contacts of the heating element with a multimeter in resistance measurement mode. If the device shows a break (one or infinity), the heating element has burned out and requires replacement. The resistance rate is usually from 200 to 400 Ohms.
Freon leakage: symptoms and troubleshooting
Freon (refrigerant) is the “blood” of the refrigerator, circulating in a closed circuit. If a microcrack has formed in the system, the gas gradually evaporates. This is one of the most common reasons why one chamber stops freezing, while another one works normally or is overloaded. Freon is odorless and colorless, so it is impossible to immediately notice a leak visually.
If there is a partial leak of refrigerant, its volume is only sufficient for the first cooling circuit (usually a freezer). The refrigerant simply does not reach the second chamber (refrigeration) or it reaches it already warm. In this case, the compressor can work continuously, trying to gain temperature, but due to a lack of substance, the efficiency drops.
How to determine the leak yourself:
- 👀 Inspect the internal walls of the chambers and the rear grille from the outside for oily stains (freon leaves along with the compressor oil).
- 🔊 Pay attention to the work compressor: if it works non-stop, but does not turn off, this is an alarming signal.
- 🌡️ Touch the condenser (grid at the back): if it is cold or warm only partially, and not hot over the entire area, it means there is not enough freon.
It is impossible to fill the refrigerator with freon yourself. Special equipment is required to evacuate the system and accurately fill by weight. In addition, you need to find the leak, otherwise the gas will escape again in a week. Most often, tubes burst in the foamed part of the housing due to corrosion.
Clogged capillary tube
The capillary tube is a very thin copper channel connecting the condenser and evaporator. Its diameter is a fraction of a millimeter. This is where a sharp drop in refrigerant pressure occurs, which provides cooling. If moisture or oil breakdown products enter the system, clogging (often an ice plug or a clot of dirt) is formed.
If the capillary tube is clogged, the circulation of freon is disrupted. The compressor tries to push the gas, hums, but the refrigerant does not flow into the evaporator in the required volume. The result is the same as with a leak: one chamber (usually the one closest to the compressor) freezes, but the one farthest does not. Sometimes you can notice frost on the filter drier or at the site of the blockage, or, conversely, a lack of heating.
Diagnosis of the blockage requires professional intervention. The technician checks the pressure in the system. If, when the compressor is operating, the suction pressure is lower than normal and the discharge pressure is higher, this indicates a blockage. To clear the blockage, the system often needs to be purged with nitrogen under high pressure and the filter drier replaced.
Problems with the compressor and start relay
Although the compressor rarely fails completely without noise, it inefficient operation is a common cause of problems. In two-compressor models (where each chamber has its own motor), everything is simple: one compressor burns out - one chamber does not freeze. But in single-compressor models (one motor for two chambers) the situation is more complicated.
If the compressor has “played up” and lost compression (wear of the piston group), it cannot create sufficient pressure to pump freon through both circuits or through the entire volume of the evaporator. As a result, the cold is distributed unevenly. It's also worth checking start relay. If it is burnt, the compressor may hum, click and not start, or only start for a few seconds.
Symptoms of compressor problems:
- 🔊 Loud knocking or clanging noise when starting.
- 🔥 Strong heating of the motor housing (impossible to touch with your hand).
- ⚡ Frequent shutdowns of the protective relay (clicks are heard every few minutes).
It is important to note that replacing a compressor is an expensive repair, which is often comparable to buying a new refrigerator, especially if the unit is more than 10 years old years.
Faults in electronics and sensors
In modern models with electronic control (for example, Samsung with a digital display), the control module is responsible for the distribution of cold. It reads readings from temperature sensors and commands the dampers to open or close. If temperature sensor it is lying in one of the chambers (shows that it is already cold there, although it is warm there), the module will cut off the air supply.
Also often fail air duct dampers. These are electrically driven mechanical curtains that regulate the air flow between the chambers. If the damper drive is stuck in the closed position, the cold simply will not enter the refrigerator compartment. You can check this by getting to the air duct and trying to manually (with the power off) open the damper.
Below is a table for quickly diagnosing symptoms:
| Symptom | Probable reason | Difficulty of repair |
|---|---|---|
| The freezer is working, the refrigerator is warm | No Frost system clogged, damper malfunction | Average |
| Both chambers freeze slightly, compressor does not turn off | Freon leak, compressor wear | High |
| The refrigerator turns on and immediately turns off (clicks) | Malfunction of the start relay or compressor | Low/High |
| There is an error code on the display (for example, Er or blinking) | Sensor or control module failure | Medium |
Comparative analysis: one camera vs two
Understanding exactly which camera is not working narrows down the search. In refrigerators with one compressor and one cooling circuit (where freon flows sequentially: first to the freezer, then to the refrigerator), malfunction most often indicates a leak or blockage. There is simply not enough cold for the second stage.
In systems with two circuits (Dual Cooling) or two compressors, the chambers are more independent. Here the problem is local: the defrost heating element in the freezer has burned out - the freezer does not work. The sensor in the refrigeration room is faulty - the problem is only there. This simplifies diagnostics, but makes repairs more expensive due to the complexity of the design.
⚠️ Attention: If you have a refrigerator with the Full No Frost system, under no circumstances pick at the back wall of the freezer with sharp objects, trying to “break through” the ice. You will puncture the evaporator, and repairs will become economically unfeasible.
☑️ Checklist before calling a technician
When repair impossible or impractical
Unfortunately, there are situations when repairs do not make sense. If the refrigerator body bulges (swollen) in the area of the foamed part, this means that corrosion has eaten away the piping inside the wall. Such tightness can only be restored by installing an external evaporator (“crying”), which spoils the appearance and efficiency.
It is also economically unprofitable to change the compressor in old models of refrigerators (over 10-12 years old). The cost of a new engine, work by a technician, refilling with freon and transportation can be 70-80% of the cost of a new similar unit. In such cases, it is wiser to consider purchasing new equipment with a guarantee and a modern energy efficiency class.
What is a “crying evaporator”?
This is an aluminum plate or tube that the master attaches inside the chamber on top of the factory one. This is a “crutch” that allows you to revive a refrigerator with a leak in the foamed part without opening the case. It looks unaesthetic, but it works.
Frequently asked questions (FAQ)
Why did the refrigerator start to freeze after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrost system (No Frost). The ice melted, the fan started working, and the cold started. But since the heating element or thermostat is broken, the new ice blocked the system again. Replacement of burnt elements is required.
Is it possible to operate the refrigerator if one chamber does not freeze?
For a short time - yes, if you transfer the food to the working area. However, prolonged operation in this mode is harmful to the compressor, which will wear out, trying to reach an unattainable temperature. In addition, bacteria will begin to multiply in a warm chamber.
How much does the repair cost if refilling with freon is needed?
The price consists of the cost of visiting, searching for leaks, sealing tubes, vacuuming and refilling. On average, this can range from 30% to 50% of the cost of a new budget refrigerator. The technician will tell you the exact amount after diagnosis.
Does the level of inclination of the refrigerator affect the cooling of the chambers?
Yes, it does. If the refrigerator is tilted, the oil may not return to the compressor or may stagnate in one of the pipeline elbows, which impedes circulation. Make sure that the unit is strictly level, the adjustable legs allow you to do this.