The situation when the refrigerator freezes properly in the freezer, but in the main compartment the temperature rises to room temperature is a classic symptom of a serious malfunction. The owner of the unit often does not notice the problem right away: the food in the freezer remains hard, the ice freezes, and only after a few days the milk in the refrigerator compartment begins to spoil or the cold disappears. This condition indicates a violation of the refrigerant circulation or a malfunction in the temperature control system.
In modern models, especially with the system No Frost, the distribution of cold is forced. If the fan has stopped or the channels are clogged, cold air cannot physically enter the upper chamber. In two-compressor models, the situation is radically different: there is a separate circuit responsible for each zone, and the problem may lie in the electrics or a freon leak in the refrigeration chamber circuit.
Understand the operating principle of your model is a key factor for initial diagnosis before calling a technician. You should not ignore the first signs, such as the hum of the engine or the formation of ice in unusual places, since timely treatment can save the compressor from overheating and costly replacement.
Fundamental differences between cooling systems
To correctly determine the cause of the breakdown, you need to clearly understand what type of refrigerator is installed in your kitchen. In devices with one compressor and system Full No Frost cold is generated in the freezer compartment, and then driven by a fan into the refrigeration compartment through special air ducts. If the compressor is working, but there is no cold above, it means that the air logistics are disrupted.
In units with a drip system (crying evaporator) or static cooling, the mechanics are different. Here the cold is distributed due to natural convection or local evaporators. If the freezer is working in such a refrigerator, but it is warm in the main chamber, this often indicates a refrigerant leak or a clogged capillary tube, since the freon simply does not reach the desired section of the circuit.
Two-compressor models require special attention. In them, two independent circuits with their own motors are responsible for the freezer and refrigerator compartment. If you have just such a device, then a working freezer only means that one circuit is intact. The problem is localized in the second circuit: the second compressor has burned out, the thermostat has failed, or there is a leak in this particular circuit.
⚠️ Attention: Never try to open sealed pipe connections without the appropriate equipment and skills. The refrigerant is under pressure, and moisture entering the system will instantly damage the compressor.
Failure of the defrost and evaporator system
The most common reason for the lack of cold in the main chamber when the freezer is running in systems No Frost is freezing evaporator. The defrost heating element, timer or defrost sensor may fail, causing ice to completely block the air supply channels. The fan is humming, but the air simply does not pass through the ice plug.
You can diagnose this problem by listening to the operation of the unit. If you hear the motor humming, but there is no characteristic noise of the fan or air flow from the holes in the rear wall, most likely the channels are clogged with ice. In some models, the indicator is an error code on the display, which can be deciphered in the instructions for Samsung, LG or Bosch.
For a temporary solution, you can completely defrost the refrigerator, leaving it turned off for a day. If after switching on the cold appeared, but after a week or two the situation repeated itself, it means that one of the elements of the defrosting system (heating element, sensor or timer) is faulty and requires replacement.
How to check the defrosting heating element with a multimeter?
To check, you need to get to the evaporator (remove the back panel in the freezer). The heating element rings for resistance. If the device shows a break (infinity), the heating element has burned out and requires replacement. Normal resistance is usually several hundred ohms.
It is important to note that constant operation of the compressor in an attempt to cool the chamber when the channels are clogged leads to its overheating. Thermal relay the motor may begin to turn off, which you will hear as clicks and short hums.
Problems with refrigerant circulation
If the defrost system is working properly, or you have a refrigerator with a drip system, the next probable cause is a violation of freon circulation. This may be caused by a leak or blockage. If there is a leak, the amount of gas in the system decreases, and its pressure is only enough to cool the first section of the circuit - usually the freezer. The refrigerant simply does not reach the refrigeration compartment in the required aggregate state.
A clogged capillary tube is a mechanical obstruction, often caused by moisture entering the system or oil breakdown products. The symptoms are similar to a leak: the freezer is very cold, but the refrigerator compartment is warm. In this case, the compressor can work almost non-stop, trying to gain temperature.
It is difficult to determine a leak visually, since it often occurs in foamed parts of the housing or in solder areas. However, there are indirect signs:
- 🔹 Swelling of the inner wall of the refrigerator (especially in models with a weeping evaporator).
- 🔹 Black deposits or oily spots in the compressor area.
- 🔹 The compressor is hot to the touch, and the condenser (grid at the back) cold or warm only partially.
Repair in this case requires calling a technician who will pressure test the system with nitrogen, find the leak, replace the filter drier and fill the refrigerator with freon.
Faults of the compressor and start relay
In two-compressor models, failure of one of the motors leads exactly to the situation described. If the compressor of the refrigerator compartment does not start, then there will be no cold there. The cause may be a burnt-out motor winding, a jammed piston group, or a faulty start relay.
The start relay is a small plastic block that fits onto the compressor contacts. It supplies a starting pulse to the motor winding. If the relay is faulty, the compressor hums and clicks, but cannot start. This is a common problem that can be solved relatively inexpensively by replacing the relay.
☑️ Symptoms of a compressor malfunction
If you have a single-compressor refrigerator, then a problem with the compressor is unlikely to be the cause of the temperature difference (since the freezer is working, it means the motor is turning). However, if the compressor has lost performance (wear), it may not create enough pressure to pump freon throughout the entire circuit, and the cold will remain only at the beginning of the cycle - in the freezer.
Failures in the operation of electronics and sensors
Modern refrigerators are controlled by electronic modules. If the control board is faulty or receives incorrect data from sensors, it may not give a command to open the air supply damper or not turn on the second compressor. The temperature sensor in the refrigerator compartment could fail and show the module that there is cold there, although in fact it is warm there.
It is also worth checking the damper of the air duct. In systems No Frost it regulates the flow of cold air. If the damper is stuck in the closed position or its drive motor is burnt out, air will not flow into the chamber. This is a mechanical or electrical malfunction that requires disassembly of the internal panel.
The table below shows the main symptoms and probable causes for different types of breakdowns:
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The freezer is freezing, the chamber is warm, the hum of the fan is heard | Evaporator freezing, malfunction of the defrost system | Medium |
| The freezer is freezing, the chamber is warm, the compressor is running non-stop | Freon leak or clogged capillary tube | High (a master is needed) |
| In a two-compressor one chamber does not work | Malfunction of the second compressor or its relay | Medium/High |
| There is cold, but weak, there is no condensation on the walls | Faulty temperature sensor or damper | Average |
⚠️ Attention: Electronic modules are sensitive to voltage surges. If your light flickers frequently, it is recommended to install a stabilizer to avoid burning out the control board, the cost of which can be up to 50% of the price of a new refrigerator.
Consequences of improper operation
Often users themselves provoke breakdowns leading to the described situation. For example, loading hot products into the chamber. This causes a sharp increase in humidity and temperature, which leads to accelerated fouling of the evaporator with ice and malfunction of the sensors. The defrosting system does not have time to cope with the volume of ice.
Another mistake is the dense clogging of the air ducts with food. If you place the pan directly opposite the cold air outlet, the circulation will be disrupted. The sensor at the top of the chamber will show a high temperature, the compressor will work hard, but due to the blocked flow, the cold will be distributed unevenly.
Infrequent defrosting (for models that require this) also leads to the accumulation of an “air cushion” of ice, which insulates the evaporator. As a result, the refrigerator hums, electricity is consumed, but there is no cold.
What you can do yourself before the technician arrives
If you find a problem, first of all evaluate the degree of defrosting of the food. If there is a risk of spoilage, temporarily move them to another place or cover them with ice. Then try defrosting the refrigerator completely. Unplug it, open the doors and leave it for at least 12-24 hours. This will help if the cause is an ice jam.
After turning on, carefully monitor the operation of the unit. If after 3-4 hours of operation there is no cold in the refrigerator compartment, and the freezer continues to freeze, then the problem is deeper than simple ice. Most likely, you will need to replace parts or refill with freon.
Do not try to pick at the ice yourself with sharp objects. Damage to the evaporator tubes (especially aluminum) will lead to an immediate leak of freon and moisture entering the system, which will make repairs economically unfeasible.
Frequently asked questions (FAQ)
Can a refrigerator operate only as a freezer for a long time?
Technically yes, but this will lead to spoilage of food in the refrigerator compartment and overload of the compressor. Long-term operation in this mode can completely disable the unit, since the motor will work at its limit, trying to cool a non-existent volume.
Why did the refrigerator start working after defrosting, but a week later stopped again?
This is a sure sign of a malfunction of the automatic defrosting system (heating element, sensor or timer). Defrosting removed the ice temporarily, but since the defrosting mechanism does not work, the ice builds up again and blocks the channels after 5-10 days.
I hear gurgling in the refrigerator, but there is no cold. What is this?
The sound of gurgling or overflowing liquid often indicates the movement of freon in the system. If there is no cold, this may indicate that there is freon, but it does not circulate properly due to a blockage, or its amount is critically small (leakage).
Is it worth repairing an old refrigerator with such a breakdown?
It depends on the cost of spare parts and labor. Replacing a compressor or refueling while looking for leaks can be expensive. If the refrigerator is more than 10-12 years old, it is often more profitable to purchase a new model with energy efficiency class A+, which will consume less electricity.