The situation when it becomes warm in the refrigerator compartment, and the water in the freezer compartment stops freezing, often takes you by surprise. This is not just a household trifle, but a signal that cooling system it is not working correctly and requires immediate intervention. If you ignore the first signs, you can lose a large supply of food, and the cost of repairs can increase significantly due to the failure of the compressor.
Many equipment owners begin to panic, believing that the refrigerator is completely broken. However, in some cases the problem lies in trivial operational violations or simple malfunctions that can be fixed independently. Understanding the principles of operation refrigeration circuit will help you quickly navigate the situation.
In this article we will analyze in detail why the freezer and refrigerator compartment do not freeze well, and how to diagnose a breakdown without calling a technician. You will learn how to distinguish a serious breakdown from a temporary failure and what to do if an ice coat has formed in the chamber.
Primary diagnosis and simple causes
Before sounding the alarm and looking for service center contacts, you need to eliminate basic errors. Often the answer to the question of why a refrigerator does not freeze well lies on the surface. Check if the door closes tightly. If seal is worn out or dirty, warm air from the room constantly flows inside, and the unit simply does not have time to cool the products.
Another common reason is improper installation of equipment. If the refrigerator is too close to the wall or heating appliances, air circulation is disrupted. The gap between the back of the refrigerator and the wall should be at least 5-7 centimeters to effectively remove heat from the condenser. Also make sure that you have not loaded freshly cooked hot food into the chamber, which sharply increases the internal temperature.
Check the temperature settings. Perhaps one of the household members accidentally knocked down the regulator or switched the device to Super Freeze (super-freeze) mode for a long time, which can lead to an overload of the system. In some models with electronic control, a software failure may have occurred, which can be solved by simply disconnecting from the network for 15-20 minutes.
⚠️ Attention: If after defrosting and checking the tightness of the door, the problem persists, do not try to disassemble the back panel or touch the freon tubes yourself without special equipment.
Sometimes the cause becomes trivial overload of products. If you've packed your freezer full, cold air can't circulate. In chambers with a system No Frost it is especially important to leave space between the products for air flow through the evaporator.
Problems with the thermostat and temperature sensors
One of the key parts that controls the refrigeration cycle is the thermostat (thermostat) or electronic temperature sensor. It is this element that tells the compressor when to turn on and when to stop working. If the refrigerator stops freezing or, on the contrary, freezes too much without turning off, most likely this particular unit has failed.
Older models use mechanical thermostats, which over time lose sensitivity or stick. In modern units, such as LG or Samsungelectronic sensors (thermistors) are installed. Their breakdown is often accompanied by blinking indicators on the control panel or the appearance of error codes.
Diagnostics of the thermostat requires caution. If you have a mechanical model, you can try gently turning the temperature knobs. If a characteristic click is not heard, or the compressor does not respond to changes in the position of the handle, the part requires replacement. In electronic systems, testing is done with a multimeter by measuring the resistance of the sensor at different temperatures.
Replacing the sensor is not a complicated procedure, but requires access to the evaporator or the internal cavity of the chamber. It is important to use original spare parts or high-quality analogues, since incorrect temperature readings can lead to damage to the compressor.
Faults of the compressor and start relay
The heart of any refrigerator is the compressor. If it does not start or operates intermittently, there will be no cooling. Symptoms can be different: the unit hums, but does not start; there is a click and then silence; or the motor runs constantly, but does not produce cold.
Often the problem lies not in the motor itself, but in the start-protection relay. This small device is responsible for starting the engine and protecting against overheating. If the relay is stuck or burnt out, the compressor will not be able to start. Replacing the relay is one of the simplest and cheapest repair procedures, which you can do yourself by disconnecting the old unit and installing a new one.
A more serious situation is the breakdown of the compressor itself. If the motor windings are burned out or the piston group is mechanically worn, the entire unit will have to be replaced. Signs of a compressor malfunction may be:
- 🔥 Strong heating of the motor housing (almost to the point of being impossible to touch).
- 🔊 Loud knocking, clanging or buzzing when trying to start.
- ⚡ Frequent knocking out of plugs or machines in electrical panel.
- ❄️ Complete absence of cold when the fan is running (in No Frost systems).
If you suspect a compressor breakdown, it is better not to experiment. Professional diagnostics will allow you to accurately say whether the motor can be repaired or whether a complete replacement of the unit with refrigerant refilling is required.
Freon leakage and capillary system blockage
Freon is a refrigerant that circulates through a system of tubes and takes heat from the chambers. If a microcrack has formed in the system, the gas gradually evaporates. As a result, the refrigerator works, the compressor hums, but there is no cold or very little of it. This is a classic situation when they say that the unit “stopped freezing.”
A leak can occur anywhere: in a foamed circuit (inside the walls), in the evaporator (often due to corrosion or mechanical damage due to inaccurate defrosting) or in places where tubes are soldered. Finding a leak on your own without a leak detector and a pressure gauge station is almost impossible.
Another technical problem is a clogged capillary tube. The freon circulation system has a very thin tube that can become clogged with oil oxidation products or moisture. If clogged, freon cannot circulate freely, the pressure in the system drops, and cooling stops.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The refrigerator hums, but does not freeze | Freon leak | High (needs refilling) |
| The engine is hot, runs non-stop | Capillary clogged or leak | High |
| Cold there is, but weak | Lack of freon | Average |
| Frost only at the entrance to the evaporator | Partial blockage of the system | High |
To eliminate these problems, you need to call a technician with equipment to evacuate the system and charge it with new refrigerant. It is important to use the type of freon that is indicated on the nameplate of your device (usually it is R600a or R134a).
Is it possible to fill the refrigerator with freon yourself?
Theoretically, it is possible if you have the equipment and skills. But in practice it is difficult: you need to find the leak, solder it, vacuum the system strictly according to time and weights, and fill in the exact amount of gas. An error of 10-20 grams will lead to ineffective operation or breakdown of the compressor.
Failures in the defrost system (for No Frost models)
If your refrigerator is equipped with a system No Frost, but an ice coat has grown inside or cold air has stopped blowing, there is a problem lies in the defrost system. In such models, the evaporator is hidden behind a plastic panel, and the ice on it is normally not visible.
The defrost system consists of three main elements: a heating element (heater), a defrost sensor (thermostat) and a timer (or electronic control module). If one of them fails, the ice does not melt, but builds up and blocks the channels through which the fan drives cold air into the chamber. As a result, the refrigerator is warm, and there is a block of ice behind the back wall.
The check should begin with a visual inspection. Remove the back panel in the freezer compartment. If you see a massive layer of ice or snow blocking the fan, the defrost cycle is broken. Most often, the heating element itself burns out or the sensor “sticks”, not giving a command to turn on the heater.
☑️ Diagnostics of the No Frost system
It is important not to just chip off the ice with a knife, as you can damage the aluminum tubes evaporator, which will lead to freon leakage. It is better to defrost the refrigerator completely (turn it off for a day with the doors open) and then check the functionality of the defrosting system in test mode or by replacing faulty elements.
When you need to call a technician
Not all breakdowns can be fixed with your own hands. If you have checked the thermostat, relay, made sure that the seal is intact and there are no ice plugs, but the refrigerator still does not freeze, professional intervention is most likely required.
This is especially true for work related to a sealed circuit. Opening the system, soldering copper pipes and filling with gas require a license and special equipment. In addition, incorrect actions can lead to fire (in the case of flammable freon R600a) or final failure of the equipment.
⚠️ Attention: If you smell burnt wiring or see sparking in the compressor area, immediately unplug the refrigerator and do not turn it on until a specialist arrives.
A master is also needed if the compressor needs to be replaced. This is a complex procedure that includes dismantling the old motor, installing a new one, replacing the filter drier and accurately charging the refrigerant. Errors are unacceptable here.
Prevention and proper care
That the question “why the refrigerator does not freeze well” arose as rarely as possible, it is important to follow the operating rules. Regular defrosting (for drip systems) at least once every 6-8 months prolongs the life of the compressor. Avoid the formation of a thick ice crust, which causes the motor to overload.
Keep the condenser grid at the back of the refrigerator clean. Dust and pet hair sticking to the radiator impair heat transfer. Cleaning with a vacuum cleaner or a soft brush every six months is an excellent prevention of overheating.
Check the condition of the door seal. Wipe with a soft, damp cloth to remove any crumbs or sticky stains. If the rubber band begins to come off or has lost elasticity, you can try to restore it by heating it with a hairdryer or replacing it with a new one.
Frequently asked questions (FAQ)
How long should the refrigerator cool down after defrosting?
Usually the refrigerator takes 2 to 4 hours to reach operating temperature and automatically turn off. At this time, do not load food inside so as not to load the compressor.
Why is the freezer freezing, but the refrigerator compartment is warm?
This may indicate a clogged cold air supply channel (in No Frost systems), a malfunction of the damper that regulates the flow, or a freon leak when there is only enough gas for the first circuit cooling.
Is it possible to operate a refrigerator if it does not freeze well?
For a short time - yes, but you can’t work like that for a long time. The compressor will work non-stop, which will lead to overheating and burnout of the windings. It is better to turn off the device and find the reason.
How to check if the defrosting heating element is working?
For this you need a multimeter. It is necessary to remove the heating element, connect the probes to its contacts and measure the resistance. If the device shows a break (infinity) or zero, the heating element is faulty and requires replacement.