The situation when the refrigerator does not work in the upper chamberand the lower one continues to function normally causes bewilderment and anxiety for any owner of household appliances. Most often this happens in models with a system No Frostwhere cold air is forced by a fan from the freezer into the refrigerator compartment. If the circulation is disrupted, the products in the upper compartment begin to deteriorate, although the compressor may hum as usual.
Before calling a technician or looking for a service center, it is necessary to carry out an initial diagnosis. In many cases, the problem lies in trivial things, such as incorrectly set temperature conditions or a clogged air supply duct. Understanding the operating principle of your model Indesit, LG or Atlant will help you quickly localize the fault.
In this article we will analyze in detail the algorithm of actions when detecting a lack of cold in the upper compartment. We will look at both simple settings and complex technical faults that require specialist intervention. It is important to act consistently so as not to aggravate the situation.
Checking the settings and operating mode
The first step is to eliminate the human factor. Often, users accidentally touch the control panel or children change settings in the game. Make sure that the Holiday or Eco mode is not activated, which may turn off the cooling in the refrigerator compartment to save energy while leaving the freezer running.
Check the temperature readings on the display or controls. For normal storage of food, the temperature must be within +2...+5 °C. If the maximum is set, the system could go into defrost mode or simply not cope with the load. It is also worth checking whether the doors are tightly closed.
⚠️ Attention: If you have just defrosted the refrigerator or washed it, it should be turned on no earlier than 2-4 hours later. Starting the compressor early can lead to its breakdown due to lack of oil in the system.
Pay attention to the location of the products. If shelves are overcrowded and food is placed close to the back wall, they may block the cold air outlets. This creates a false impression of a breakdown, although air circulation it is simply blocked.
Diagnostics of the No Frost system and fan
In two-chamber refrigerators with a system No Frost for cooling the upper The compartment is controlled by a fan located in the freezer compartment. It drives cold air through a special channel. If this fan is not working, the cold simply does not reach the top.
- 🔊 Listen: When you open the freezer door, the fan should stop. If there is no sound of operation at all, the fan motor may have burned out.
- ❄️ Check the ice: if a fur coat has formed on the evaporator in the freezer, the fan may be blocked by ice and physically cannot rotate.
- 🔌 Electrical: broken wiring or oxidation of contacts can also cause the unit to stop.
To access the fan, it is often necessary to remove the back panel of the freezer. This step requires care as the plastic latches can be fragile. If you find ice on the blades, you will need to completely defrost the refrigerator within 24 hours.
How to check a fan with a multimeter?
To check, you need to remove the fan, connect the multimeter probes to the motor contacts and rotate the shaft by hand. If the resistance changes or shows a break, the part is faulty. In good condition, the winding resistance is usually several hundred Ohms.
Often the reason for the fan stopping is a malfunction of the defrost sensor. If the system “thinks” defrosting is still in progress, it will not start the fan. In this case, it is necessary to replace the sensor or check the control circuit.
Problems with the air duct damper (Damper)
Between the freezer and refrigerator compartments there is a damper (damper) that regulates the volume of cold air supplied. This is a mechanical or electronic device that opens and closes based on a signal from the thermostat. If the damper is stuck in the closed position, the upper chamber stops cooling.
In models Bosch and Siemens electronic dampers with a motor are often found. They can fail due to power surges. Mechanical dampers in simpler models can freeze or become clogged with debris that impedes their movement.
☑️ Diagnostics of the damper
If the damper is electronic, its operation can only be diagnosed when availability of appropriate knowledge and tools. In case of mechanical jamming by ice, defrosting helps. However, if after defrosting the problem returns after a couple of days, it means that the evaporator defrost cycle is broken.
Faults in the evaporator defrost system
One of the most common reasons why the refrigerator has stopped freezing at the top is fouling of the evaporator with ice. In the system No Frost ice from the evaporator must be regularly removed by a heating element (heating element). If the heating element is burned out, the defrost timer is faulty or the defrost sensor is “lying,” ice builds up and blocks the channels.
The fan starts to hum, but air does not pass through the ice plug. As a result, it is cold in the freezer (where the evaporator itself is located), but warm at the top. A characteristic sign of such a breakdown is that the refrigerator works almost non-stop, trying to gain temperature.
| Component | Function | Symptom of breakdown |
|---|---|---|
| Defrost heating element | Heating and melting of ice | Increasing “fur coat” on the evaporator |
| Defrost timer | Switching modes | The refrigerator does not go into defrost mode |
| Defrost sensor | Evaporator temperature control | Premature shutdown of the heating element or failure to turn it on |
| Fuse | Overheat protection | Circuit break, heating element does not heat |
For repairs, you will need to call a technician, since it is necessary to “test” the circuit elements and, possibly, replace the heating element. You can only completely defrost the refrigerator yourself (at least 24 hours with the doors open), which will temporarily solve the problem, but it will return in 1-2 weeks.
Freon leak and problems with the compressor
A more serious situation arises when a leak occurs in the refrigerant circulation system. In dual compressor models, this is a localized problem in one circuit. In single-compressor systems (where one motor drives freon through both circuits), a leak is often manifested precisely by the loss of cold in the upper chamber when the freezer is running.
The freon evaporates, and its pressure is not enough to reach the evaporator of the refrigerator compartment. The compressor works continuously, trying to compensate for the lack of cold. A characteristic sign is a hot condenser (grid at the back) only in the initial part or, conversely, cold along the entire length.
⚠️ Attention: If you hear hissing or whistling from inside the refrigerator or from the tubes at the back, this is a sign of an active freon leak. Immediately disconnect the device from the network and ensure the room is ventilated, as some refrigerants can be dangerous in concentration.
Restoring the tightness of the system and charging with freon is a complex technological process that requires evacuation of the system and special equipment. It is impossible to do this work efficiently with your own hands.
When you need to call a technician
There are a number of symptoms in which self-repair is not only useless, but also dangerous. If you checked the settings, carried out defrosting, made sure the fan was working, but the problem did not disappear, professional diagnostics are most likely required.
- 🛠️ Replacing the compressor: If the motor hums, but does not start (you can hear a clicking and buzzing), the compressor may be stuck or the start relay is faulty.
- 💧 Refrigerant charging: requires a license and equipment for working with gases.
- 🧠 Electronic modules: if the control board is faulty, the phases are mixed up or the tracks are burned out, you need an electronics specialist.
A technician is also needed if the refrigerator makes uncharacteristic sounds: metallic clanging, strong vibration or a burning smell. Ignoring these signs can lead to complete failure of the equipment and a fire hazard.
Frequently asked questions (FAQ)
Why is it cold in the freezer, but warm in the refrigerator?
This is a classic sign of poor air circulation in the systems No Frost. The most common culprit is a fan, an ice-clogged duct, or a faulty damper. Less commonly, there is a freon leak when the pressure is only sufficient for the first circuit (freezer).
How long does it take to defrost the refrigerator to check?
For complete defrosting and evaporation of moisture from hard-to-reach places (channels, evaporator) a minimum of 24 hours is required. Defrosting for 2-3 hours is often insufficient, and the ice plug remains, which is why the problem returns immediately after turning it on.
Is it possible to operate the refrigerator if the upper chamber does not work?
For a short time - yes, if you put the food in the freezer or use cooler bags. However, prolonged operation in this mode is harmful to the compressor, which will wear out, trying to reach a non-existent temperature. In addition, food in the heat will quickly deteriorate.
How to understand that the defrost heating element has burned out?
Without disassembling - according to indirect signs: the refrigerator works without stopping, the back in the area of the freezer can be hot, and ice builds up inside. You can accurately diagnose a burnt heating element only with a multimeter by checking its resistance (it should be within normal limits, not a break).