The situation when you open the refrigerator door and feel warmth instead of the usual cold always takes you by surprise. Products begin to deteriorate, an unpleasant odor appears, and water accumulates inside the unit. This is not just a household trifle, but a signal that cooling system has malfunctioned and requires immediate attention.
Before calling a technician or looking for a service center, it is important to understand what exactly happened to your equipment. You can diagnose many problems yourself, saving time and money. In this article, we will look in detail at why refrigerator it may stop freezing, which components fail most often, and whether you can correct the situation on your own.
Do not panic if the unit suddenly goes silent or, conversely, hums too loudly. A competent initial diagnosis will help you more accurately describe the problem to a specialist or, possibly, eliminate the problem without outside help. Let's look at the device and the reasons for the failure.
Primary diagnostics: simple checks before calling a technician
Often the reason that the refrigerator does not freeze lies in trivial things that are easy to overlook. The first step is to check the tightness of the door. If sealing rubber damaged, dirty or simply does not fit tightly, warm air constantly enters the chamber. The compressor tries to compensate for the heat, works for wear, but cannot reach the desired temperature.
Pay attention to how you load the products. If you put a hot pan in the chamber or packed the shelves too tightly, it is broken air circulation. Cold air simply cannot spread throughout the entire volume. Also check that the food has not blocked the ventilation holes on the back wall of the chamber.
⚠️ Attention: If you notice that the door does not close tightly, try washing the seal with warm soapy water. Often, grease and sticky contaminants interfere with a normal fit.
It is also important to check the temperature conditions. Perhaps one of the household members accidentally changed the thermostat settings. This happens quite often in modern electronically controlled models. Make sure that the correct parameters are set according to the season and the load on the chambers.
Problems with the compressor: the heart of the refrigeration system
The compressor is the main unit that ensures the movement of refrigerant through the system. If it does not work, then freon does not circulate, which means no cold is produced. You can determine the malfunction by ear: a working compressor operates cyclically, emitting a steady hum, then goes silent. If the motor is completely silent or, conversely, hums continuously without stopping, this is an alarming sign.
There are several typical scenarios for compressor failure. The starting relay, which is responsible for starting the engine, often fails. In this case, you can hear a characteristic click, after which the engine tries to start, but immediately stalls. The winding of the electric motor itself may also burn out, which requires replacing the entire assembly.
In some cases, the compressor works, but does not create the necessary pressure. This may be due to wear of internal parts, valves or piston group. Diagnosing such problems requires special equipment and skills, since it is necessary to measure the current consumption and pressure in the system.
Symptoms of a compressor malfunction
If the compressor is hot to the touch, but does not start, the mechanical part may be jammed. If it is cold and silent, the problem may be in the electrical circuit or thermostat.
Replacing a compressor is a complex technical process that includes opening the circuit, soldering, evacuation of the system and charging with new refrigerant. It is almost impossible and dangerous to perform this operation on your own without a professional tool.
Freon leak: where does the refrigerant disappear?
One of the most common reasons why a refrigerator stops freezing is a leak refrigerant. Freon circulates in a closed loop, and normally its amount should not decrease for years. However, over time, the metal of the evaporator or condenser tubes can corrode, especially in models that use steel.
Leaks often occur at solder joints or in the foamed part of the housing where the evaporator tubes are located. It is difficult to notice this visually: you will not see any puddles or spots, since freon evaporates as a gas. An indirect sign may be swelling of the side wall of the housing or the appearance of rust at the site of damage.
If there is little freon in the system, the compressor works almost without interruption, trying to compensate for the lack of cooling capacity. In this case, the temperature in the chambers either does not drop at all or drops very slowly. On the rear grille of the condenser (usually the black grille at the back of the refrigerator), in this case only the first section will heat up, and the rest of the part will remain cold.
| Symptom | Normal condition | When there is a freon leak |
|---|---|---|
| Operation compressor | Cyclic (working/resting) | Constant or very long |
| Condenser temperature | Evenly warm/hot | Hot only at the beginning |
| Temperature in the chamber | Complies with the settings | High, food spoils |
| Operation sound | Smooth hum | Maybe be quieter than usual |
To eliminate a leak, you need to find the location of the damage, solder it and recharge the system. If the damage is in the foamed part (inside the wall), repairs may not be economically feasible, and it is easier to purchase a new unit.
Malfunctions of the thermostat and temperature sensors
The thermostat (or thermostat) is a device that “tells” the compressor when to turn on and when to turn off. In older models this is a mechanical device with a capillary tube, in new ones it is an electronic sensor. If the thermostat is faulty, it may not send a signal to start the engine, even if the chamber is warm.
You can check a mechanical thermostat in a simple way: close its contacts directly. If after this procedure the refrigerator starts working, then the problem is in the regulator. However, it is worth remembering that this is a temporary measure for diagnostics, and you cannot operate a refrigerator with a shorted thermostat - it will work without stopping, which will lead to freezing of food and damage to the compressor.
In electronically controlled systems (No Frost), temperature is controlled by sensorslocated in different parts of the chamber. They transmit data to the control module. If one of the sensors is lying or does not work, the “brains” of the refrigerator may block the start of the compressor or fan, believing that the temperature has already been reached.
A common problem is also sticking of the contacts inside the thermostat itself. In this case, the circuit does not open and the compressor cannot start. Replacing this element usually does not take much time and does not require complex equipment.
No Frost system problems: fan and defrost
Refrigerators with the system No Frost are more complex than usual. In them, cold is created in one compartment (usually in the freezer) and distributed among the chambers using a fan. If you hear that the compressor is running, but there is no cold, the fan or defrost system may be faulty.
The fan may stop spinning due to frozen blades or motor failure. Ice blocks rotation and cold air stops flowing into the refrigerator compartment. It may be cold in the freezer, but warm below. It is necessary to defrost the unit completely (at least 24 hours) and check the operation of the fan.
The defrost system consists of a heating element (heater), a timer (or controller) and a defrost sensor. If the heating element burns out or the timer does not switch modes, a “coat” of ice builds up on the evaporator. This ice blocks the air channels. As a result, the refrigerator hums, but does not freeze.
- 🧊 Ice build-up: the main sign of problems with defrosting is a thick layer of ice on the back wall or bottom of the freezer.
- 🔇 No fan sound: if you cannot hear the fan operating when the freezer door is open (in some models you need to press the door sensor button), check it.
- 💧 Water on the floor: if the drainage hole is clogged with ice, the water has nowhere to drain, and it flows out.
Diagnostics of the heating element and timer requires a “diagnosis” multimeter to check for open circuit. Often it is the heating element that fails, which simply burns out over time.
Clogged capillary tube and other technical nuances
The capillary tube is the thinnest channel through which freon is supplied to the evaporator. The diameter of this channel is very small, so it is sensitive to contamination. If there is moisture in the system, it can freeze at the narrowing point and form an ice plug. Also, a blockage can be caused by oxidation products or dirt that got in during poor-quality repairs.
Signs of a blockage are similar to a freon leak: the compressor works for a long time, the condenser is hot unevenly, there is no cold. However, if clogged, the condenser can be completely hot, since the freon does not go anywhere, but simply does not circulate. Only a technician with a pressure gauge manifold can distinguish a blockage from a leak.
Another rare but possible cause is the oxidation of contacts in the electrical circuit. Check the plug, socket and wires going to the compressor. Sometimes it’s enough just to tighten the contacts or replace the plug to get the refrigerator working again.
☑️ Primary check checklist
⚠️ Attention: Do not try to break through the ice plug in the capillary tube with sharp objects or heating with an open fire. This can lead to depressurization of the system and a fire.
When professional repairs are needed
Despite the desire to save money, there are situations where non-professional intervention will only aggravate the situation. If you have diagnosed a freon leak, a compressor malfunction, or a complex blockage, it is better to contact a service center. This work requires special tools: a vacuum pump, scales for charging freon, a burner and pressure gauges.
In addition, incorrect refrigerant charging (of the wrong type or in the wrong quantity) can quickly kill a new compressor. Modern refrigerants (for example, R600a) are explosive, which requires strict safety measures during operation.
If the refrigerator is under warranty, any independent repair will lead to loss of warranty. Opening seals or signs of tampering with the structure will be grounds for refusal of free service.
In conclusion, regular maintenance and proper operation will extend the life of your refrigerator. Do not load hot food, keep the condenser at the back clean and periodically defrost the unit, even if it is a No Frost system. This will help avoid many problems in the future.
Why does the refrigerator work, but does not freeze after defrosting?
Most often the reason is that the system did not have time to reach the operating mode. After defrosting, the compressor takes time (2 to 6 hours) to reach temperature. If more time has passed, the defrosting heating element may have been damaged during defrosting or ice remains in the drainage system, which blocks operation.
Is it possible to use a refrigerator if it does not freeze?
It is not recommended to operate a faulty refrigerator. The compressor, running empty, will quickly overheat and burn out. In addition, in the heat, bacteria will begin to multiply in the chambers, which is dangerous to health. It is better to turn off the unit and call a technician.
What to do if ice forms in the refrigerator?
Ice disrupts heat transfer. It is necessary to completely defrost the refrigerator (unplug, open the doors, leave for at least 24 hours). You cannot chip the ice with a knife - you can damage the evaporator, and then you will have to throw out the refrigerator.
How to understand that the compressor has burned out?
If you hear a click when you turn it on, the motor hums for a couple of seconds and turns off, and then clicks again - most likely the compressor is jammed or the starting relay is faulty. If the motor is silent and does not heat up, the problem is electrical. If the buzzing is constant and very hot, there may be an interturn short circuit.