The situation when the refrigerator suddenly loses cold takes any home cook by surprise. Products begin to deteriorate, and condensation appears on the shelves or, conversely, an ice crust appears where there should not be any. This is not just a household inconvenience, but a signal that there has been a failure in the system refrigerant circulation or temperature control.
Before calling a technician or panicking, it is worth conducting an initial diagnosis. Often the reason lies in trivial things that can be fixed in a few minutes without special tools. However, ignoring the problem can lead to failure of an expensive compressor.
In this article we will look in detail at why the refrigerator stopped freezing, how to identify the malfunction based on its characteristic signs, and what you can do yourself. We will touch on both simple operating errors and complex technical breakdowns that require professional intervention.
Why is it cold in the freezer and warm in the refrigerator?
One of the most common complaints is uneven cooling of the chambers. You open the freezer, everything is frozen there, but in the main compartment the food begins to leak. This phenomenon often indicates a problem with air circulation inside the unit.
In modern models with a system No Frost the fan is responsible for the distribution of cold. If it stops or its impeller is blocked by ice, the cold air simply does not reach the upper chamber. In models with a drip system (crying refrigerator), the reason may lie in clogged channels through which freon enters the evaporator.
It is also worth checking the settings. Perhaps one of the household members accidentally changed the operating mode or turned on the quick freezing function, which redirects all compressor resources to the freezer compartment, ignoring the refrigerator compartment.
⚠️ Attention: If you notice that the back wall of the refrigerator compartment is covered with a “coat” of ice, and there is water below, do not try to break off the ice with a knife. This can damage the evaporator, which will lead to freon leakage and expensive repairs.
Prolonged operation in this mode is dangerous for the engine. The compressor tries to compensate for the lack of cold in the main chamber by working without interruption. This leads to overheating of the windings and shortening the service life of the unit.
Checking simple causes: settings and operation
Before looking for complex breakdowns, make sure that the refrigerator is configured correctly. Often users forget to return the temperature control to the normal position after defrosting or washing. The thermostat could have gone astray, and now the system simply does not receive the cooling command.
Pay attention to the loading density. If you've just placed a large pot of hot soup in the freezer, or a lot of room-temperature food, your refrigerator may be temporarily unable to cope. It needs time to get into operating mode.
Check the tightness of the door. If sealing rubber band is worn out or dirty, warm air enters the chamber. The compressor works constantly, but cannot reach the desired temperature, since heat is constantly coming from outside.
- 🧊 Check that the ventilation holes are not blocked by products.
- 🚪 Make sure that the door closes tightly and is not warped.
- 🌡️ Measure the temperature in the chamber with a thermometer, without relying only on indicators.
It is also worth inspecting the condenser (the grille at the back). If it is clogged with dust, animal hair or fluff, heat exchange is disrupted. The refrigerator has nowhere to dump heat, and cooling efficiency drops to zero.
Malfunctions of the thermostat and temperature sensors
If the settings are in order, but the cold does not flow, the problem may be in the “brains” of the system - the thermostat or electronic sensors. In older models, a mechanical thermostat is responsible for this, in new ones - digital sensors.
A mechanical thermostat is a device with a capillary tube that senses temperature. Over time, the mechanism wears out, the contacts oxidize or “stick.” As a result, the compressor either does not turn on at all or works without stopping.
In electronically controlled units (Full No Frost, Smart Cooling), thermistors are responsible for the temperature. If the sensor shows incorrect values (for example, “in the chamber -5°C”, although there is +10°C), the control board will not give a command to start the compressor.
| Symptom | Probable cause | Check method |
|---|---|---|
| Compressor silent | Thermostat is faulty | Close the thermostat contacts |
| Error on the display | Sensor failure | Diagnostics of error codes |
| The refrigerator works non-stop | Contacts sticking | Resistance measurement |
Diagnostics of the thermostat at home is possible with a multimeter. It is necessary to remove the device and check its conductivity. If, when the temperature drops (for example, by putting it in the freezer), the resistance does not change or the circuit does not close, the part requires replacement.
Problems with the compressor and start relay
The heart of the refrigerator is the compressor. If it doesn't start, there won't be any cold anywhere. Sometimes you can hear a quiet click, a hum that ends abruptly, or complete silence of the unit.
Often the culprit is starting relay. This is a small block that helps the engine start. If it burns out or the contacts are oxidized, the compressor receives power, but cannot start. Replacing the relay is a simple procedure, accessible even to a beginner.
A more serious problem is an interturn short circuit in the motor windings or a wedge in the piston group. In this case, the motor may hum, heat up, but not rotate. Sometimes the thermal protection relay is triggered and the unit shuts down completely.
⚠️ Attention: If you hear a loud knock when trying to start or smell a burning smell, immediately unplug the refrigerator. Continued operation may lead to a fire in the wiring.
To check the compressor, specialists use a pressure gauge station, measuring the discharge pressure. If there is no pressure or it is critically low, the motor needs to be replaced. It is not recommended to change the compressor yourself, as this requires evacuation of the system and charging with freon.
Freon leakage and clogged capillary system
If the compressor runs smoothly and without stopping, but there is no cold; most likely, the tightness of the system is broken or a blockage has formed. The refrigerant (freon) circulates in a closed circuit, and if it has evaporated, cooling becomes impossible.
Leaks often occur in places where pipes are soldered or in the evaporator, especially if it was damaged during defrosting. Signs of a leak: quiet operation of the motor (no characteristic gurgling), a hot condenser (or a cold one if the freon is completely out), lack of cold.
Clogging of the capillary tube occurs due to moisture or debris entering the system. An ice plug forms at the site of the blockage, which blocks the movement of freon. A characteristic sign is that one part of the evaporator is cold and the other is warm.
- 🔍 Look for oily spots on the tubes at the back of the refrigerator.
- ❄️ Pay attention to the swelling of the side walls (with a foamed evaporator).
- 🔊 Listen: gurgling should be heard during operation; its absence is a bad sign.
Repair in such cases requires calling a technician with equipment. It is necessary to find the leak, seal it, replace the filter drier, pump out the air with a vacuum pump and fill the system with new freon in a strictly defined amount.
Why can’t you just add freon?
Refueling without leak detection is a temporary measure. Freon does not disappear anywhere on its own, it comes out through a hole. In a week or two, the problem will repeat, and the compressor may burn out from working with incorrect pressure.
Failures in the No Frost system
In refrigerators with the system No Frost there are additional elements that are not in conventional models: a fan, a defrost heating element, a defrost timer and a defrost sensor. If one of them fails, the evaporator becomes overgrown with ice and blocks the air supply channels.
Most often, the defrost heating element burns out or the sensor that should turn on the heating breaks. As a result, the ice does not melt, it builds up layer by layer and eventually blocks the fan. The refrigerator stops freezing, although the compressor may be working properly.
You can check the operation of the defrost system visually by getting to the evaporator. If it's covered in ice and the fan is on, that's the problem. The fan itself could also fail, and then the air simply does not circulate through the chambers.
⚠️ Attention: Models and locations of defrosting elements vary greatly between different brands (Indesit, Samsung, LG). Before disassembling, be sure to study the diagram of your device so as not to damage the plastic latches.
To diagnose the heating element, test it with a multimeter. If the resistance is infinitely high, the spiral burns out. The defrost timer is checked for its ability to switch between the “cooling” and “defrost” modes when scrolling the slots.
Algorithm of actions when a problem is detected
If you find that the refrigerator is not freezing, act sequentially. Chaotic actions can only make the situation worse. First, exclude external factors, then proceed to internal diagnostics.
☑️ Primary diagnostics of the refrigerator
Start with defrosting. Even if you No Frost, leave the refrigerator turned off for a day (at least 12 hours) with the doors open. This will help melt any possible ice blockages in the channels and evaporator. After turning on, let the equipment work for several hours without loading food.
If defrosting does not help, proceed to checking the electronics and mechanics. Use a multimeter to check the continuity of the circuits. If you do not have the skills to work with electricity, it is better to stop at the stage of checking the compressor and start relay and call a specialist.
Remember that timely contacting professionals often saves money. Replacing a compressor that has burned out due to overheating will cost many times more than timely replacement of a cheap sensor or relay.
FAQ: Frequently asked questions
Can a refrigerator stop freezing due to the heat in the room?
Yes, high ambient temperature (above +32°C) may interfere with heat exchange. The condenser does not have time to cool down, the pressure in the system rises, and the compressor goes into protection or works ineffectively. In such cases, you need to ensure a flow of fresh air to the back wall.
How long does it take for the refrigerator to get cold after defrosting?
Usually it takes from 2 to 6 hours to reach operating mode. At this time, you should not load the products completely. If after 8-10 hours the temperature has not dropped to normal, then there is a malfunction.
Why does the refrigerator turn on and then immediately turn off after defrosting?
This may indicate a malfunction of the start relay or thermostat. It is also possible that there is air or moisture left in the system, which will create a blockage when it freezes. Diagnostics by a specialist is required.
Is it dangerous to use a refrigerator if it does not freeze well?
This is dangerous primarily for food (risk of poisoning). For equipment, this is fraught with wear and tear on the compressor. If the temperature in the main chamber is above +6°C, the unit cannot be used for storing perishable foods.