Situation when In the freezer compartment, food is petrified from the cold, and in the upper compartment it is warm and food spoils, this is one of the most common and insidious problems in the operation of household appliances. Many owners, having discovered that refrigerator compartment has ceased to perform its functions, begin to panic, believing that the unit is completely out of order and requires an expensive replacement. However, if the compressor hums and the freezer continues to freeze, this indicates that the cooling system is partially functioning, but the refrigerant circulation or cold distribution is impaired.
Understanding what exactly happened often depends on the type of unit you have: No Frost or drip system. In the first case, the culprit may be a stopped fan or a burnt-out defrost heating element, and in the second, a clogged capillary tube or a freon leak. It is important not to ignore the first signs: condensation on the back wall, an ice coat in one corner, or simply insufficient cooling of the products can be the key to diagnosis.
Before calling a technician or disassembling the unit, it is worth conducting an initial visual diagnosis. Often the problem lies not in complex internal components, but in trivial things: incorrectly set temperature, dense loading of food, or even a stuck door. Let's look at the main scenarios, why the refrigerator does not freeze in the top compartment, and what you can do yourself.
Problems with air circulation in No Frost systems
In modern models with the system No Frost cold is produced in the evaporator, which is usually located in the freezer or behind a partition. Next fan forces this cold air into the refrigeration compartment through special air ducts. If the freezer is working properly, and it’s warm at the top, this almost always means a violation of the circulation of air masses.
The most common cause is the formation of an ice plug in the air supply channel. This occurs when the automatic defrost system fails. In normal mode Defrost heating element it periodically turns on and melts the ice on the evaporator. If the heating element burns out, the temperature sensor or defrost timer fails, ice builds up and blocks the path to air. As a result, the freezer, located closer to the source of cold, continues to work, and the upper chamber remains warm.
How to check the fan?
If you hear the hum of the compressor, but silence where the fan should be making noise, it may be jammed with ice or burnt out motor winding. In some models, when the freezer door is open, the fan is forcibly turned off by a sensor button - check this.
It is also worth checking the damper, which regulates the air flow. If the damper mechanism is stuck in the closed position, the cold simply does not enter the upper chamber. This can happen due to mechanical damage or a foreign object. In such cases repair requires disassembling the rear panel of the freezer and checking the passage of the channels.
Clogged capillary tube or refrigerant leak
If you have a classic refrigerator with a single cooling chamber or a weeping system, and you notice that condenser (grid at the back) is only partially hot or completely cold, but there is cold in the freezer, but weaker than usual, we can talk about problems with the refrigerant. In such models, freon passes through the freezer first, and only then enters the refrigeration chamber circuit.
One of the main reasons is clogged capillary tube. The microscopic hole in the tube, where freon sharply expands and cools, can become clogged with oil oxidation products or moisture. As a result, the refrigerant cannot circulate freely throughout the entire circuit. It boils and cools only the initial section (freezer), and simply does not reach the upper chamber in the required volume and condition.
⚠️ Attention: If you hear periodic gurgling or hissing inside the refrigerator, and then there is silence, and the upper chamber does not cool, this is a sure sign blockage or lack of freon. It is impossible to clean the capillary yourself without a vacuum pump and nitrogen.
The second option is freon leak. Even a microscopic hole in the circuit leads to a decrease in pressure over time. Since the freezer compartment is located closer to the compressor outlet, it receives residual cold, while the remote refrigerator compartment ceases to cool at all. Leaks often occur in foamed parts of the body or in solder areas, which makes finding them difficult even for professionals.
To diagnose leaks, technicians use leak detectors and pressure gauges, measuring the pressure in the system. If the pressure is below normal, the system is sealed, vacuumed and refilled. This is one of the most difficult procedures, requiring special equipment.
☑️ Signs of a freon leak
Malfunctions of the thermostat and temperature sensors
The electronics control the operation of the refrigerator, giving commands to the compressor to turn on and off. If thermostat (thermostat) is faulty, it may give incorrect signals. In a scenario when the freezer is working and it’s warm at the top, the thermostat may “think” that it’s already cold enough in the chamber and turn off the compressor too early, preventing the temperature from reaching the entire volume.
In models with electronic control, temperature sensors (NTC thermistors) are responsible for this. If the sensor in the refrigerator compartment fails and shows a falsely low temperature to the controller, the system will stop producing cold or turning on the compressor. At the same time, the freezer may have its own sensor, which continues to work correctly, maintaining a low temperature there.
Diagnostics of these elements is carried out using a multimeter. It is necessary to “ring” the thermostat contacts or measure the resistance of the sensor at different temperatures. If the values do not correspond to the manufacturer's technical data sheet, the part must be replaced. This is one of the few procedures that you can perform yourself if you have basic skills.
It is also worth checking the settings in the menu (if there is one). Sometimes users accidentally activate the "Vacation" or "Eco" mode, which specifically reduces the cooling power in the refrigerator compartment to save energy, leaving the freezer in operating mode.
Table: Comparison of symptoms and probable causes
To quickly identify the problem, use the table below. It will help to compare the observed symptoms with the most likely technical malfunctions.
| Symptom | Probable cause | Difficulty of repair | Required equipment |
|---|---|---|---|
| Ice in freezer, warm at the top (No Frost) | Malfunction of the defrost system (heating element, timer) | Medium | Multimeter, screwdrivers |
| The compressor is hot, humming constantly | Freon leak or capillary blockage | High | Vacuumator, pressure gauge, freon |
| Noises, but does not cool | Stuck compressor or fan | High/Medium | Tool set, soldering iron |
| There is cold, but weak | The door does not fit tightly or the seal is worn out | Low | Hair dryer (for straightening the seal) |
The influence of seals and chamber tightness
Often the problem lies not in the hardware, but in a violation of the tightness. If sealing rubber band the door of the refrigerator compartment is worn out, dirty or deformed, warm air from the room constantly enters the chamber. The cooling system simply cannot cope with the heat influx, while a tightly closed freezer (which is opened less often) retains the cold.
You can check the tightness with a simple test with a sheet of paper. Clamp the sheet with the door around the entire perimeter. If it pulls out without effort or falls out easily, the seal is broken. It is also worth inspecting the door itself for distortions. If the door is skewed, it will not fit tightly, which will lead to constant freezing of the “coat” and overload of the compressor.
In some cases, the cause is a clogged drain hole. If the water does not leave the defrost, it freezes below, forming an ice plug that rises up and can disrupt the operation of the sensors or simply interfere with normal heat exchange. Cleaning the drainage with a special flexible brush often solves the problem.
⚠️ Attention: Never use sharp metal objects to chip ice inside the chambers. One awkward movement can break through the evaporator wall or the cooling circuit, which will lead to an instant freon leak and expensive repairs.
Algorithm of actions when a malfunction is detected
If you find that the refrigerator has stopped freezing in the upper compartment, do not rush to call service. Follow a series of simple steps that will help eliminate trivial causes or prepare your equipment for a technician’s visit. First, defrost the refrigerator completely. Even if there is visually no ice, microcrystals in the No Frost system could block the channels.
After defrosting, turn on the unit and listen. Will the compressor start? Will the fan work? Will the cold appear within 2-3 hours? If after complete defrosting the situation repeats itself a day later, then the problem is technical. If cold appears and lasts for several days, and then disappears again, this confirms a malfunction of the defrosting system.
☑️ Primary diagnostic plan
It is also important to assess the condition of the products. If the meat is soft in the freezer and warm in the refrigerator, this means a complete shutdown of the system. If the meat in the freezer is hard and warm at the top, the problem is local (circulation, blockage, leakage). This information will be extremely useful to the technician during an initial consultation by phone.
Is it possible to operate the refrigerator if the upper chamber does not work?
Short-term operation is possible, but undesirable. The compressor will work in increased mode, trying to reach the set temperature, which will lead to its overheating and eventual failure. In addition, the products in the upper chamber will spoil.
How long does it take to repair the No Frost system?
Replacing the heating element or defrost sensor takes about 1-2 hours, taking into account defrosting. Replacing a compressor or finding a leak can take from 3 hours to a whole day, depending on the difficulty of access and the need to order parts.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a classic symptom of a malfunction of the automatic defrosting system. Defrosting manually eliminated the ice blockage temporarily, but since the heating element or timer does not work, the ice builds up again and blocks the channels again.
Does the voltage level in the network affect the operation of the refrigerator?
Yes, low voltage may prevent the compressor from starting or cause it to work with overload. However, in this case, the entire cooling system usually suffers, and not a separate chamber, unless one of the control modules has burned out.
Is it necessary to change freon when replacing a compressor?
Yes, when replacing a compressor or repairing a leak, the system is evacuated and charged with a new refrigerant of a strictly defined brand and weight, indicated on the nameplate refrigerator.