The situation when freezer compartment continues to perform its functions, while in the main compartment the heat or temperature is insufficient to preserve the products, is one of the most common and alarming for owners of household appliances. This behavior of the device often confuses the user, because logically it seems that if one unit is working, then the entire system is working. However, in modern and old models of refrigerators, different components or one common element that does not work properly may be responsible for cooling different zones.
The first thing that needs to be done when a problem is detected is to assess the scale of the disaster. If indicators the control panel blinks or lights up red, and the food in the main chamber begins to thaw, you cannot hesitate. It is critically important to understand that a working compressor does not always mean a working cooling system as a whole. Often the motor hums without interruption, trying to compensate for the lack of cold, but physically cannot cool a large volume due to a technical malfunction.
Next we will analyze the main reasons why this temperature imbalance occurs and determine what steps you can take on your own, and when it is necessary to call a technician. Self-diagnosis will help save time and, possibly, money if the problem lies in small things that do not require complex intervention.
⚠️ Attention: If you hear a sharp whistling sound during operation or smell a chemical smell, immediately unplug the device and ensure the room is ventilated. This may indicate a refrigerant leak.
Faults in the No Frost and defrost system
In refrigerators with a system No Frost cooling of the main compartment occurs due to the circulation of cold air, which is forced from the freezer through special channels. If the freezer is freezing but the refrigerator is warm, this often indicates that the air is simply not reaching the top compartment. The most common reason is freezing of the evaporator or air supply channels.
The defrosting system consists of several key elements: Defrost heating element, defrost sensor (thermostat) and a timer or electronic control module. If any of these components fails, a coat of ice builds up on the evaporator, blocking air access to the main chamber. Visually, you may not notice this, since the evaporator is hidden behind a plastic panel.
- ❄️ Heating element defrost: The heating element may burn out, stopping melting the ice on the evaporator.
- 🌡️ Defrost sensor: Does not transmit a signal about the need to turn on the heating or, conversely, does not turn it off in time.
- 🧊 Fan: If the fan blades are frozen to the ice or the motor is burned out, air circulation stops completely.
For diagnostics at home, the complete defrosting method is often used. It is necessary to unplug the refrigerator for at least 12–24 hours, leaving the doors open. If, after turning on, the device begins to freeze normally in both chambers, but after 1-2 weeks the problem returns, it means that the defrosting system is really faulty and requires replacement of components.
⚠️ Attention: When defrosting, it is strictly forbidden to use hair dryers, hot water or sharp objects to chip ice inside the chambers. This may damage the plastic evaporator housing or pipes.
Refrigerant (freon) leak
One of the most serious reasons why freezer compartment works, but the refrigerator is warm, is a partial leak of refrigerant. In two-chamber refrigerators with one compressor, freon first passes through the freezer, where it releases some of the cold, and then enters the circuit of the main compartment. If the gas in the system becomes less than normal, it is only enough for the first stage - freezing, and the refrigerant reaches the refrigeration chamber insufficiently cooled.
Leakage can occur in different places: in the foamed part of the body, in places where pipes are soldered or through the evaporator. The insidiousness of this malfunction is that it develops gradually. At first, the refrigerator starts working longer, then it turns on more often, and only then the owner notices that the food is spoiling. In this case, the compressor can work without stoppingtrying to gain temperature.
It is difficult to diagnose a leak without special equipment, but there are indirect signs. Pay attention to the condenser (the grille at the back or the side walls): if it is cold or only partially warm, this is a sure sign of a lack of freon. You may also experience swelling of the inner wall of the refrigerator or the appearance of rust in certain places.
Why can’t you just add freon?
You can’t just “refill” the refrigerator. First you need to find the leak, fix it, and only then fill the system strictly by weight. Otherwise, the gas will escape again, and the compressor may burn out from working on an “empty” system.
Problems with the compressor and its performance
The compressor is the heart of the refrigerator, and its improper operation directly affects the distribution of cold. If motor-compressor has exhausted its resource, it may continue to hum, but not create sufficient pressure in the system. In this case, freon circulates, but its pressure is only enough to cool the first circuit (freezer), and the pressure no longer brings the refrigerant to the upper compartment in the required state.
Often users confuse this problem with a leak, since the symptoms are very similar: the compressor works constantly without turning off. However, with low compression (wear of the piston group valves), there is pressure in the system, but it is weak. You can check this by touching the return pipe (included in the compressor): during normal operation it should be slightly warm or at room temperature, and during heavy production it can be cold or even covered with frost immediately at the entrance to the motor.
Repair in this case requires replacing the compressor with a new one, since reassembling the old one at home is impossible and economically infeasible. It is also important to check the start-up relay, which may malfunction, preventing the motor from reaching full power.
- 🔊 Operation sound: Change in the usual hum, the appearance of metallic knocks or too quiet operation.
- 🔥 Case temperature: The compressor may become excessively hot (more than 90°C) or remain cold.
- ⚡ Energy consumption: A sharp increase in electricity bills due to continuous operation of the engine.
Clogged capillary tube
The capillary tube is a thin copper pipeline that serves as a choke in the cooling system, separating the high and low pressure zones. If a blockage forms inside it (a plug of oil, oxidation products or moisture), the circulation of freon is disrupted. The situation develops according to a scenario similar to a leak: the freezer can freeze (sometimes even too much, forming a “snow coat”), but the refrigerator will be warm.
The blockage can be periodic. For example, when cooled, the plug contracts and releases freon, and when heated, it expands and blocks the current. Therefore, the owner can observe cyclical behavior: the refrigerator freezes, then stops. Often, when clogged, the condenser (warm grille at the back) remains cold, since hot freon does not reach it due to blockage.
To eliminate this malfunction, the system must be evacuated, purged with nitrogen, and the filter drier replaced. This is a complex procedure that requires professional equipment. It is impossible to clean the capillary yourself without opening the system.
⚠️ Attention: Do not try to open the copper tubes yourself or drill holes in the housing to “bleed” the system. Gas released under pressure can be dangerous, and moisture getting inside will completely kill the refrigerator.
Malfunctions of the thermostat and sensors
In some models of refrigerators, especially old or budget ones, different temperatures in different chambers may be responsible for the temperature in different chambers thermostats or sensors. If the temperature sensor in the refrigerator compartment “lies” and shows the control module that the cold has already been collected, the compressor will turn off, preventing the food from cooling. In this case, the freezer, which has its own sensor, can operate in normal mode.
In electronic models with a display, a sensor error is often displayed in the form of flashing symbols or an error code. In mechanical models with one adjustment knob, the problem may lie in the thermostat itself, which does not physically open the contacts when the desired temperature is reached, or, on the contrary, opens them too early.
You can check a mechanical thermostat by closing its contacts directly (for diagnostics). If the refrigerator then starts to freeze in both chambers, then the problem is in the sensor. However, this method requires disassembling the device and having skills in working with electrical circuits.
☑️ Diagnostics before calling a technician
Comparative table of symptoms and causes
For ease of diagnosis, we present the main signs that will help you navigate the nature of the malfunction. Remember that an accurate diagnosis can only be made by a specialist with a pressure manifold and a tester.
| Symptom | Probable cause | Difficulty of repair | Can I do it myself |
|---|---|---|---|
| The refrigerator turns on, but does not freeze, the compressor is hot | Clogged capillary tube | High | No |
| The freezer is freezing, the refrigerator is warm, the compressor works without stops | Freon leakage | High | No |
| After defrosting it works fine, after a week it does not freeze again | Faulty defrost system (heating element, sensor) | Average | Yes (if you have the skills) |
| The compressor hums, clicks and turns off | Faulty start relay or compressor | Medium/High | Partially (relay replacement) |
| The chamber is warm, but there is no ice on the walls | Thermostat malfunction | Low/Medium | Yes |
When you need to call a specialist
Despite the desire to save money, there are situations when independent repairs can lead to final breakdown of the unit. If you make sure that the door closes tightly, the thermostat is set correctly, and complete defrosting did not help, most likely the problem lies in the sealed circuit or electrics.
Working with refrigerants requires a license and special equipment. Attempts to solder a tube yourself or replace a compressor without a vacuum sealer often end with moisture remaining in the system, which after a short time causes the new compressor to fail. In addition, modern refrigerators are filled with complex mixtures of gases, the incorrect filling of which will disrupt heat transfer.
It is also worth contacting professionals if the refrigerator makes unnatural sounds, you can feel it there is a burning smell or you see sparking in the compressor area. In such cases, further operation may be a fire hazard.
Is it possible to operate the refrigerator if the upper chamber does not freeze?
For a short time - yes, if you put perishable foods in the freezer. However, prolonged operation of the compressor without shutting off (which often happens with such symptoms) will lead to overheating and combustion. In addition, bacteria will begin to multiply in a warm chamber.
How long should defrosting last to check?
For complete thawing of ice in the hidden channels of the No Frost system, a minimum of 12 hours is required, and preferably 24 hours. Simply turning off the refrigerator for 2 hours is not enough; the ice plug may remain deep in the channels.
It is important to keep the doors open during defrosting and collect the draining water so that it does not fall on the electrical components at the bottom of the refrigerator.
Why did the refrigerator work after defrosting, and then stop again?
This is a classic sign of a malfunction defrost systems. While you were defrosting the unit manually, the ice melted, the channels became free, and cold air flowed into the chamber again. But since the heating element or sensor does not work, new ice will block the system again in 1-2 weeks.
Does the amount of food in the refrigerator affect cooling?
Yes, it does. If the refrigerator is filled to capacity with food, air cannot circulate between the shelves. This can create the illusion of failure when the back wall is cold and the door is warm. Also, you should not put hot dishes, this violates the temperature regime.
What to do if there is water in the refrigerator, but it does not freeze?
Water can be a product of melting ice due to improper operation or the result of a clogged drainage hole. Check to see if the condensate drain hole at the bottom of the rear wall of the chamber is clogged. It can be carefully cleaned with a brush or soft wire.