The situation when the upper chamber in a two-chamber refrigerator stops freezing often takes you by surprise. Products begin to deteriorate, and condensation appears on the shelves or, conversely, the temperature becomes too high for freezing. This is a common problem faced by owners of equipment of different brands, from budget models to premium Side-by-Side systems.
There can be many reasons for this behavior of the unit: from banal overload with products to serious failure of the compressor. Double-chamber refrigerators they are more complex than single-chamber analogues, since they require precise distribution of cold between two isolated volumes. Understanding how your model operates is the first step to successful diagnosis.
In this article we will examine in detail the mechanical and electrical faults that lead to the disappearance of cold in the freezer. You will learn how to carry out initial diagnostics without calling a technician and in which cases independent repair is impossible. It is critically important to understand that if the compressor runs constantly, but there is no cold, this is a sign of a freon leak that requires professional intervention.
⚠️ Attention: Before starting any diagnostic work, be sure to disconnect the refrigerator from the power supply. Working with electrical appliances under voltage is life-threatening.
Operation errors and temperature settings
Before suspecting a breakdown, it is worth eliminating the human factor. Often, users accidentally change settings or overload the camera, disrupting air circulation. In modern electronically controlled models, a program failure could occur due to a power surge. Check if the Settings → Temperature minimum cooling mode is set.
Another common reason is that the freezer is tightly packed. If food is placed close to the back wall or blocks the air ducts, cold air simply cannot circulate. In systems No Frost this is especially critical, since the fan will not be able to drive air through clogged ducts.
- ❄️ Check the position of the temperature regulator - it may be accidentally shifted to the "Minimum" or "0" position.
- 📦 Make sure that the products do not block the cold air openings on the rear wall.
- 🚪 Inspect the door sealing rubber: if it does not fit tightly, warm air constantly flows inside.
It is also worth paying attention to the “Super Freeze” mode. If you turned this feature on and forgot to turn it off, the refrigerator could go into emergency mode or, conversely, turn off the main cooling cycle after completing the task. The instructions for models Indesit i Atlant often indicate a timer for automatically turning off this mode.
Problems with the No Frost defrosting system
If you have a refrigerator system No Frostthen the lack of cold at the top is often associated with a malfunction of the defrosting system. Ice builds up on the evaporator, which is hidden behind the rear panel, and blocks the fan from working. The air stops circulating and the freezer stops cooling, although the compressor may continue to hum.
The main culprits here are three elements: Defrost heating element, defrost thermostat and timer (or electronic module). If the heating element burns out, the ice does not melt during the pause. If the thermostat breaks down, it does not give the command to turn on the heating. As a result, in a few days a giant ice block is formed, which completely blocks the channels.
How to diagnose the problem without analysis?
Turn on the refrigerator and listen. If you do not hear the fan noise inside the freezer, but the compressor is working, most likely the fan is jammed with ice or it is out of order.
To check, you need to defrost the unit for 24 hours with the doors open. If, after complete defrosting, the refrigerator began to freeze normally, but after 1-2 weeks the problem returned, the diagnosis is confirmed. The defrosting system does not work, and the ice again blocks circulation.
- 🔥 Defrost heating element - a heating element that should melt the ice on the evaporator.
- 🌡️ Defrost sensor - monitors the temperature of the evaporator and turns off the heating element when the required values are reached.
- ⏱️ Timer or control board - responsible for switching the “Cooling” and “Defrosting” modes.
⚠️ Attention: When defrosting, it is strictly forbidden to use sharp objects to chip ice or hair dryers to speed up the process. Damage to the evaporator tubes will lead to freon leakage and costly repairs.
Malfunctions of the thermostat and temperature sensors
In refrigerators with mechanical controls, thermostatis responsible for the temperature. This device measures the temperature in the evaporator or in the chamber itself and opens the compressor power circuit when the target is reached. If the contacts inside the thermostat are stuck in the "Open" position, the compressor simply will not turn on and the cold will stop being produced.
In models with electronic control (Electrolux, Samsung, LG), this function is performed by air sensors. They may give incorrect readings due to oxidation of contacts or internal breakage. If the sensor “lies” and shows the module that the chamber is already -25°C, although it is 0°C there, the compressor will not start.
Diagnostics of a mechanical type thermostat is often carried out by the method of exclusion. You can temporarily close the contacts with wires (observing safety precautions!). If the refrigerator then started working and started freezing, the thermostat is faulty and requires replacement.
Refrigerant leak and problems with the compressor
The most unpleasant situation is a leak Freon. The refrigerant circulates in a closed circuit, and if a microcrack forms in the tubes or condenser, the gas gradually evaporates. First, the refrigerator starts working longer, then it stops turning off, and eventually stops freezing at all. In two-chamber models, it is often the top that suffers first, since freon simply does not reach there.
The compressor is the “heart” of the refrigerator. If it hums but does not start (a clicking and humming noise is heard), the start relay may have burned out or the motor-compressor itself has jammed. In such cases, it is often necessary to replace the entire assembly. Modern inverter compressors Panasonic or LG are more difficult to diagnose and require special equipment.
| Symptom | Probable cause | Nature of the malfunction |
|---|---|---|
| The compressor is silent, there is no light | Problems with the electrical network | Power surge, faulty socket |
| Humming, but not freezing | Freon leakage | Circuit leakage |
| Clicks and buzzes | Compressor malfunction | Winding jammed or burned |
| Works without stopping | Loss of tightness | Door seal or gas leak |
It is almost impossible to detect a leak visually, since freon is colorless and odorless. Craftsmen use leak detectors or paint the system with a special composition. It is impossible to refill the refrigerator on your own; the system must be evacuated and accurately refilled.
Clogged capillary tube
The capillary tube is a very thin channel through which freon enters the evaporator. The diameter of this channel is a fraction of a millimeter. If moisture or oil breakdown products are present in the refrigerant circulation system, a blockage may form (often an ice plug at the outlet to the evaporator).
If clogged, freon cannot circulate freely. The compressor tries to push gas, works with overload, but the cooling capacity drops to zero. The upper chamber (freezer) stops freezing first, since this is where the main heat exchanger is located.
⚠️ Attention: Purging the capillary tube with nitrogen under high pressure is a dangerous procedure. Without professional equipment and skills, it is easy to damage the solder or the tube itself, which will turn a simple repair into a complex replacement of the evaporator.
☑️ Diagnosis of a blockage
Damage to the door seal
It would seem like a simple rubber band, but it plays key role. If seal it becomes dry, cracked or simply dirty, it no longer fits tightly to the body. Warm, humid air from the room is constantly sucked into the freezer.
Moisture from the air instantly freezes on the walls, forming a snow coat. In No Frost systems, this leads to the fan problems described above. In drip systems, ice blocks the cold from reaching the food. The compressor is working hard, trying to compensate for the heat influx, but it can’t cope.
You can check the seal in a simple way: hold a sheet of paper with the door. If it is pulled out without effort in different places around the perimeter, the tightness is broken. Sometimes simple washing and lubrication with silicone helps, but more often the magnetic tape needs to be replaced.
- 🧼 Regularly wipe the seal with a soft cloth and soapy water, removing grease and sticky stains.
- 💨 Use a hair dryer (carefully!) or boiling water to straighten dents on a new one rubber band.
- 🔍 Inspect the corners of the door - creases most often form there.
Frequently asked questions (FAQ)
Why in the Indesit refrigerator the top does not freeze, but the bottom works?
B models Indesit with the No Frost system, this is a classic sign of a malfunction of the defrosting system (the heating element or timer has burned out). Ice is blocking the air ducts in the freezer. It is also possible for freon to leak when its quantity is only enough for the lower circuit or it leaves completely, leaving the top warm.
Is it possible to operate a refrigerator if it does not freeze at the top?
For a short time - yes, to finish eating food. Long-term operation is harmful to the compressor, which will work non-stop, trying to gain temperature. This will lead to its overheating and eventual failure. In addition, the food in the upper chamber will spoil.
How long does it take to defrost the refrigerator to check?
It takes at least 24 hours for the ice in the hidden cavities of the evaporator to completely melt. Do not rush to turn on the unit earlier. It is better to leave the doors open for a day so that the moisture completely evaporates.
Why, after defrosting, did the refrigerator stop freezing again after a week?
This confirms that the problem is not in the amount of ice, but in the mechanism for removing it. Most likely, one of the elements of the automatic defrosting system (heating element, sensor, timer) is faulty. Ice has accumulated again and blocked the system.
Does freon freeze in the tubes?
Freon itself does not freeze at the operating temperatures of a household refrigerator. However, if there is moisture in the system, it can freeze in the capillary tube, creating an ice plug that blocks the circulation of the refrigerant.