The situation when you open the refrigerator door, the light comes on, the hum of the compressor is heard, but there is warmth inside, can cause panic in any home cook. This is a classic sign that the electrical part is working, but the cooling cycle is broken or the settings are lost. Complete loss of cold in the main chamber when the freezer compartment is running - this is a specific symptom indicating a limited range of malfunctions.
The first thing to do is not to panic and carry out an initial check diagnostics. Often the cause is a banal shift in temperature or blockage of air channels by products. However, the problem cannot be ignored, since lack of cooling leads to food spoilage and the proliferation of bacteria.
In this article we will look in detail why The refrigerator has stopped freezinghow to distinguish a software failure from a serious breakdown and in which cases you will need to call a technician. You will learn how to check the thermostat, sensors and defrost system without special equipment.
Primary diagnostics: settings and operating modes
Before looking for technical faults, it is worth eliminating the human factor. Modern models, such as LG No Frost or Samsung Side-by-Side, are equipped with complex electronics that can be easily knocked down by accidental pressing. Check to see if the Holiday or Eco mode is activated, which specifically raises the temperature in the main compartment to save energy.
⚠️ Attention: If you have recently defrosted or moved the refrigerator, make sure that enough time has passed for the refrigerant pressure to stabilize. Starting the compressor immediately after transportation may lead to its breakdown.
It is also worth paying attention to the loading density. If you put a large amount of warm food in the chamber or tightly packed the shelves, it is violated air circulation. Cold air simply cannot reach the temperature sensor, and the compressor turns off, “thinking” that the norm has been reached. Free up space at the back wall.
Check the thermostat settings. In mechanical models, the knob could move to the “minimum” position, and in electronic models, the calibration could be lost. Try to set the average values, usually 3-4 degrees Celsius for the main camera. If after changing the settings within 2-3 hours the situation has not changed, the problem is deeper.
Problems with door seals and seals
One of the most common reasons why The refrigerator does not hold the temperatureis a violation of the seal cameras. If the rubber seal (cuff) on the door is worn out, dirty or deformed, warm air from the room constantly enters the chamber. The compressor works non-stop, trying to compensate for the heat influx, but cannot cope with the volume.
You can check the tightness in a simple way using a sheet of paper. Press the door around the perimeter of the sheet and try to pull it out. If the paper comes out easily and without resistance, it means in this place the seal does not fit. Also inspect the rubber for cracks, tears or sticky deposits that could have formed from fat.
- 🧼 Wash the seal thoroughly with warm water and soap to remove the fatty film that interferes with adhesion.
- 💨 Use a hair dryer to slightly warm up the deformed areas of the rubber and try to return them to shape.
- 🔧 Check the door hinges: if they are skewed, the door will not close tightly even with the seal intact.
In some cases, especially in older models like Indesit or Atlant, there is a problem lies in the sagging of the door. Adjusting the hinges can solve the problem of warm air access. If the rubber has become hard and brittle, only a complete replacement of the cuff will help.
Faults in the defrost system (for refrigerators No. Frost)
If you have a model with the system No Frost, and the refrigerator has stopped freezing, but the compressor is humming, most likely there has been a failure in the evaporator defrost system. In such units, cold is generated in the freezer and supplied by a fan to the main compartment. If the evaporator is covered with ice, the air stops circulating.
The key elements here are the defrost heating element, the defrost thermostat and the timer (or electronic module). If they malfunction, the ice does not melt, builds up a “fur coat” and blocks the air supply channels. Visually this may not be noticeable, since the evaporator is hidden behind a plastic panel.
| System element | Function | Symptom of failure |
|---|---|---|
| Defrost heating element | Heats evaporator for melting ice | The ice does not melt, the compressor works constantly |
| The defrost thermostat | Turns off the heating element when the temperature is reached | The heating element does not turn on or heats for too long |
| Fan | Drives cold air into the chamber | Noises, crackles or stands still (frozen) |
Diagnostics requires partial disassembly of the rear wall of the freezer. If you find a thick layer of ice on the radiator, then the defrost system has not worked. In this case, it is necessary to “check” each element of the circuit with a multimeter for an open or short circuit.
How to defrost a No Frost refrigerator correctly?
To completely defrost the No Frost system, it is not enough to simply turn it off at night. The unit must be left switched off with the doors open for at least 24 hours. This is the only way to have time to melt the ice in hard-to-reach channels and on the evaporator hidden behind the panels.
Failures in the operation of the thermostat and sensors
The thermostat (thermostat) is the “brain” that commands the compressor to turn on or off. If the refrigerator does not freezebut the light is on, the thermostat contacts may have oxidized or it has lost sensitivity. In mechanical models, this is a simple part with a bellows; in electronic models, there are complex resistance sensors.
In electronically controlled models, such as Bosch or Siemens, air sensors are responsible for the temperature. If one of them fails and shows incorrect data (for example, that it is -5°C in the chamber, although it is +15°C), the control module simply will not start the compressor. The normal temperature or an error code may appear on the display.
Checking a mechanical thermostat is possible by closing its contacts. If the compressor starts when the wires are shorted, then the problem is in the temperature controller. For electronic sensors, resistance measurements at different temperatures are required and comparison with a table of ratings for a specific model.
☑️ Diagnostics of the thermostat
Freon leak and compressor malfunction
The most unpleasant reason for the lack of cold is a refrigerant (freon) leak or Compressor motor failure. If the refrigerant has left the system, then there is simply nothing to kill. The compressor may work around the clock, trying to build up pressure, but the refrigerator compartment will remain warm. The freezer may slightly grab food at the back wall, but there will be no full cold.
It is difficult to determine the leak visually, since freon is colorless and odorless. An indirect sign may be swelling of the rear wall inside the chamber or, conversely, the absence of the characteristic gurgling and noise of flowing liquid during operation. Also pay attention to the condenser (grid at the back) - if it is cold when the compressor is running, this is a sure sign freon leak.
A compressor breakdown is often accompanied by a change in the operating sound. Instead of a steady hum, you may hear a metallic clang, clicks from the start relay, or a hum followed by decay. If the compressor is hot to the touch, but does not start, the piston group is probably jammed or the winding is burned out.
⚠️ Attention: Self-filling the refrigerator with freon is impossible without special equipment (vacuum pump, pressure gauge station, scales). An attempt to simply “add gas” without searching for leaks and evacuating the system will lead to a quick re-breakdown.
When you need to call a technician: critical breakdowns
There are a number of situations where do-it-yourself repairs are not only ineffective, but also dangerous. If you have diagnosed a refrigerant leak, a compressor replacement, or a faulty electronic control module (circuit board), it is best to contact a professional. These works require qualifications, special tools and consumables.
Also, the help of a specialist is needed if, after defrosting for 24 hours, the refrigerator does not start to freeze. This suggests that the problem is not an ice jam, but a technical malfunction of the unit. You should not delay repairs, since running the compressor idling if there is a freon leak can quickly cause it to fail completely.
When calling a technician, be sure to tell the model of the refrigerator (for example, Stinol 103 or Liebherr Comfort) and the symptoms: “the light is on, the motor is humming, there is no cold.” This will allow the technician to take the necessary spare parts with him and will reduce the repair time.
Frequently asked questions (FAQ)
How long does the refrigerator need to start working after defrosting?
Usually it takes from 2 to 5 hours to collect the first portion of cold. It may take up to 24 hours for food to completely freeze and return to operating mode. If after 6 hours the temperature does not drop, there may be a malfunction.
Why does the refrigerator freeze only near the back wall?
This may be a sign of an incipient freon leak or a fan malfunction in No Frost systems. Also check whether the food is moved too close to the back wall, blocking the air flow.
Is it possible to operate the refrigerator if it does not freeze, but works?
It is strictly not recommended. The compressor will work hard, trying to reach a non-existent temperature, which will lead to overheating and combustion. In addition, food in a warm chamber will quickly deteriorate.
What does it mean if the compressor turns on for a couple of seconds and turns off?
This is a sign of a malfunction of the start-up relay or the compressor itself (jamming). Also, such symptoms are possible if there is a strong freon leak when the thermal protection of the motor is triggered.