The situation when you open the refrigerator door and see a light on, but there is room temperature inside is a classic sign of a serious malfunction. The fact that power is supplied to the device (since the light comes on) narrows the range of possible problems to the nodes directly responsible for generating cold. Often, equipment owners panic, believing that the unit has completely failed, but in many cases the problem lies in specific, fixable components of the system.
Diagnostics should begin with an understanding of the basic principle of operation: electricity starts compressorwhich drives the refrigerant through a system of tubes. If the engine does not start or the freon has evaporated, there will be no cooling, despite a working electrical network. It is important not to ignore the first signs: a quiet hum, rare clicks or complete silence of the motor when plugged in.
Before calling a technician, it is necessary to conduct an initial visual analysis. Check if the air circulation inside the chambers is blocked and listen to the engine. If you hear the engine trying to start but immediately stalling, or, conversely, running continuously without stopping, these are key clues to determine the type of breakdown. Next, we will look at the main reasons why refrigerator stopped freezing.
Malfunctions of the compressor and start relay
The most common reason for the lack of cold when the lighting is on lies in compressor or its launch system. The compressor is the heart of the refrigerator, and if it does not beat, the system does not function. Often the problem lies not in the motor itself, but in starting relay a small device that supplies the starting impulse. If the relay is burned out, the compressor hums, but cannot start, or is completely silent.
In some cases, the engine itself may be jammed or have an interturn short circuit in the windings. This is a more serious breakdown that requires replacement of the unit. When you try to start a faulty compressor, you may hear a characteristic click of the relay, followed by a humming noise and then shutting down after a few seconds. Such cyclicity is a sure sign that thermal protection works, preventing the wiring from burning out.
⚠️ Attention: If you hear a loud click and a buzzing sound that ends abruptly, immediately disconnect the device from the network. Prolonged attempts to start a faulty compressor can lead to its complete combustion or ignition of the starting relay.
Diagnosing the relay often requires removing it and checking the contacts, as well as assessing the condition of the coil. In models with inverter compressors, the situation is more complicated: there the electronic module is responsible for starting, and simply replacing the relay is impossible. If your refrigerator equipped with an inverter system, diagnostics require special equipment.
How to check the starting relay yourself?
To check the relay, you need to remove it from the compressor (after disconnecting the refrigerator from the network). Shake the relay: if a ringing sound is heard inside (as if from broken ceramics), it means the posistor or contacts are damaged. You can also test the contacts with a multimeter, but this requires electrical skills.
Refrigerant (freon) leakage
If the compressor runs smoothly, without jerking or clicking, but there is no cold, there is a high probability freon leaks. The refrigerant circulates in a closed circuit, and any microcrack in the condenser or evaporator tubes leads to its gradual or rapid release to the outside. Without a sufficient amount of freon, heat exchange does not occur, and the temperature in the chambers rises.
Leakage can occur due to metal corrosion, mechanical damage (for example, due to careless defrosting with a sharp object) or manufacturing defects in welds. In modern models with a foamed evaporator (located in the walls of the housing), finding the location of the leak is difficult. In such cases, it is often necessary to either change the entire evaporator by installing a hinged one, or declare the refrigerator beyond repair.
Detecting a leak visually is difficult, since freon is a colorless and odorless gas. However, there are indirect signs:
- 🔴 The compressor works continuously, without turning off, trying to gain temperature.
- 🔴 The condenser grille at the back of the refrigerator remains cold or barely warm.
- 🔴 A snow coat may appear in the freezer only at the entrance, and the depth is not freezes.
It is important to understand that simply “adding freon” is not a solution to the problem. First, the technician must find and repair the leak, evacuate the system, and only then charge in new refrigerant. If you ignore the search for a hole, the gas will leave again after a short time.
Clogged capillary tube
Another technical reason why the refrigerator stopped freezing is Clogged capillary tube. This thin copper tube connects the condenser and evaporator, creating the necessary pressure for the circulation of freon. Over time, oxidation products, moisture or oil residues can accumulate in the system, which form a plug.
When there is a blockage, the compressor works with increased load, trying to push the refrigerant through the obstacle. This is often accompanied by a characteristic sound: a steady hum is replaced by gurgling or whistling. The pressure in the system is disturbed: at the inlet to the compressor it drops, and at the outlet it increases, which can lead to damage to the seals or the motor itself.
To eliminate this malfunction you need:
- 🔵 Purge the system with nitrogen under high pressure.
- 🔵 Replace filter drier, which could also be clogged.
- 🔵 Evacuate the system and fill with new freon.
It is almost impossible to remove the blockage on your own, since it requires special tools and access to sealed connections. Attempts to break through the blockage yourself can lead to rupture of the tubes and complete loss of freon.
Problems with sensors and electronics
In modern models, especially with the system No Frost, the temperature is monitored by electronic sensors and control modules. If the temperature sensor in the chamber fails and transmits incorrect data (for example, that it is -20°C inside, although it is +10°C), the controller simply will not give the command to turn on the compressor. The light is on because the power circuit is independent, but there is no cold.
A malfunction of defrost sensor or the defrost timer is also common. If the system “thinks” that a defrosting process is in progress, it blocks the compressor from operating. As a result, the evaporator becomes overgrown with ice, blocking the air circulation channels, and cold stops flowing into the chamber, although the motor may turn on periodically.
Main symptoms of electronics:
- ❄️ Error codes light up on the display (for example, F1, E2 or flashing indicators).
- ❄️ The compressor does not turn on at all, although the relay clicks are not heard.
- ❄️ The refrigerator randomly turns on and off at short intervals.
Diagnostics of electronic components requires testing the sensors with a multimeter for resistance. Often it is enough to replace a cheap sensor to refrigerator work again. However, in difficult cases, it may be necessary to reflash or replace the main control module.
| Symptom | Probable cause | Nature of operation motor | Difficulty of repair |
|---|---|---|---|
| The motor hums and clicks | The starting relay is faulty | Starts for 1-3 seconds, then clicks | Low |
| Motor runs constantly | Freon leak or blockage | Smooth hum without stopping | Medium/High |
| Motor silent, no light | Problem with wiring/socket | Absent | Low |
| Motor does not turn on, there is light | Temperature sensor/Electronics | Absent | Average |
Violation of tightness and thermal insulation
Sometimes the problem lies not in the “internals”, but in the violation of the tightness of the chambers. If sealing rubber band the door is worn out, dirty or damaged, warm air constantly enters the chamber. The compressor tries to compensate for the heat, working for wear, but cannot cope with the volume of incoming heat.
You can check the tightness of the door with a simple test with a sheet of paper. Clamp the sheet with the door around the perimeter: if it pulls out too easily or falls out, the seal is broken. The reason may also be that the door is skewed due to loose hinges or improper installation of the refrigerator (support legs are not adjusted).
⚠️ Attention: Frequently opening the door or placing hot food in the chamber also creates the “not freezing” effect. The compressor does not have time to remove heat, and the illusion of a breakdown is created. Give the equipment time to recover.
In addition to the rubber band, it is worth checking the door itself for cracks and the condition of the hinges. If the door is skewed, one side may fit tightly, while the other side may move a few millimeters away, causing loss of cold. Adjusting the hinges often solves the problem without calling a technician.
Diagnostics and simple steps before calling a technician
Before submitting a repair request, complete a basic checklist. This will help save time and possibly money if the problem turns out to be trivial. Often, users miss obvious things, focusing on complex breakdowns.
☑️ Primary diagnostics of the refrigerator
If after checking it turns out that the compressor is silent, try carefully (with the refrigerator turned off from the network!) tapping the handle of a screwdriver on the housing of the start relay. Sometimes stuck contacts open due to vibration, and the equipment temporarily comes to life. This is not a repair, but a diagnostic sign.
Also pay attention to the location of the capacitor grille at the rear. If it is hot (or warm) at the bottom and cold at the top, this may indicate a blockage. If it is all cold while the engine is running, there is probably a freon leak. These observations will help the technician over the phone more accurately give a preliminary cost of the work.
Frequently asked questions (FAQ)
Why does the refrigerator click but does not start?
The clicking sound is usually made by the start relay, trying to start the compressor. If the clicking sound is followed by a humming sound and shutting off, the compressor is unable to start rotating. Reasons: motor jamming, interturn short circuit or malfunction of the relay itself. The relay or, in the worst case, the compressor needs to be replaced.
Can the refrigerator not freeze due to a power surge?
Yes, a power surge could damage the start relay, thermostat or electronic control module. If after a power surge the equipment stops working, first check the fuses and relays.
How long does it take for the refrigerator to start freezing after defrosting?
After complete defrosting (24 hours off), the refrigerator takes from 2 to 6 hours to reach operating temperature in empty chambers. If you load it with products immediately, the time will increase to 12-24 hours. If the temperature in an empty chamber has not dropped in 6 hours, look for a malfunction.
Is it dangerous to continue to operate a refrigerator that does not freeze?
If the compressor works constantly, trying to gain temperature (if there is a freon leak), it will overheat and may burn out, which will lead to more expensive repairs. If it does not turn on at all, there is no danger other than food spoilage. In case of constant clicks and humming, it is better to turn off the device.
What to do if there is ice in the freezer and heat in the refrigerator compartment?
This is a classic sign of a malfunction of the defrost system (No Frost) or a freon leak. The evaporator in the freezer is covered with ice, which blocks the fans, and cold air does not circulate into the upper chamber. Defrosting for 24 hours and subsequent diagnostics by a technician are required.