The situation when you open the refrigerator door and it’s warm inside always takes you by surprise. The food begins to deteriorate, the ice melts, and a panicky desire arises to immediately call a specialist. However, before looking for a service center, you should calmly understand the situation, since often the problem lies in small things that can be fixed on your own in a few minutes.
Modern refrigeration units are complex systems where the failure of one element can lead to a stop in the entire operation. Failure to operate can be caused by either a simple power surge or a serious refrigerant leak. Understanding the principles of operation of your equipment will help you quickly localize the problem.
In this article we will look in detail at all the possible reasons why refrigerator it stopped freezing, and we will draw up a clear action plan. You will learn to distinguish between symptoms when repairs require the intervention of a professional, and cases when a simple adjustment or defrosting is sufficient.
Primary diagnosis and simple causes
Before disassembling the back wall or checking the compressor, it is necessary to eliminate basic operating errors. Often, users do not notice that the operating mode was accidentally changed or the door is not closed tightly due to a piece of food getting in.
Check whether the defrost or emergency temperature indicator is on. If it blinks, it is a signal that the inside of the chamber is too warm. Make sure that the equipment is connected to the network securely and that the plug has not jumped out of the socket. Sometimes the problem is solved by a simple reboot: turn off the device from the network for 10-15 minutes and turn it on again.
Pay attention to the position of the temperature regulator. In a hurry, children or pets could push the knob to the "0" or "Off" position. Also check the tightness sealing rubber along the perimeter of the door. If it is dirty or deformed, cold air escapes out and the motor cannot cope with the load.
⚠️ Attention: If you notice that the door is skewed or the hinges are sagging, do not try to forcefully slam it. This may permanently damage the closing mechanism or break the shelves.
It is important to check whether anything is blocking the ventilation holes inside the chamber. Shelves filled to the top block air circulation, which causes temperature sensors to read incorrect data and the compressor does not turn on on time.
Problems with the defrosting system and ice
One of the most common reasons why refrigerator poor freezing is the formation of an excessive layer of ice on the evaporator. In systems No Frost i Low Frost an automatic defrosting system is responsible for removing moisture. If it fails, the ice coat grows and blocks the operation of the fan.
The fan stops driving cold air through the chambers, and the temperature begins to rise, although the compressor can work continuously. In such cases, you can often hear a humming or cracking sound from the ice inside the case. For diagnostics, you will need to completely defrost the unit within 24 hours.
After defrosting, check whether the water has gone into the drainage hole. If water sits in the pan or flows out onto the floor, it may be clogged drainage channel. It must be cleaned with a soft wire or a brush to restore the outflow of condensate.
☑️ Proper defrosting of the refrigerator
If after complete defrosting and turning on the refrigerator worked normally, but after 2-3 weeks the problem recurred, it means that one of the elements of the defrosting system is faulty. This could be an evaporator heating element, a defrost sensor or a timer.
Malfunctions of the thermostat and sensors
The thermostat (thermostat) is the “brain” that commands the compressor to turn on or off. If it is faulty, the refrigerator may simply “not know” that it has become warm inside. In mechanical models it is a simple tube with gas, in electronic models it is a digital sensor.
Signs of a thermostat failure are often obvious: the compressor either does not start at all or works non-stop, freezing food into stone. In the first case, the contacts inside the regulator oxidized or burned, in the second, they were “stuck” in a closed state.
In modern models with electronic control, thermal sensorsare responsible for temperature control. There may be several of them: in the refrigerator, in the freezer, on the evaporator. The failure of even one sensor leads to incorrect operation of the entire system.
⚠️ Attention: Replacing the thermostat requires precise adjustment. An incorrectly set switching temperature can lead to rapid wear of the compressor or spoilage of food.
Diagnostics of the thermostat at home is only possible visually (for melting) or by exclusion. If you turn the regulator knob, but no characteristic clicks are heard, and the motor is silent, there is a high probability of its breakdown.
How to check a mechanical thermostat with a multimeter?
To check, remove the thermostat, immerse its sensitive tube in cold water with ice. Test the contacts with a multimeter: when cold, the circuit should open (or close, depending on the type), and when heated, it should change state. If the resistance does not change, the part is faulty.
Freon leakage and problems with the compressor
The most unpleasant and expensive reason is refrigerant leak (freon). Freon circulates in a closed circuit, and if a microcrack forms in the tubes or condenser, the gas evaporates. Without freon, the refrigerator works, but does not cool.
The compressor in such a situation may hum, trying to gain pressure, but there will be no cold. Often, when there is a freon leak, the condenser (grid at the back) remains only partially cold or warm. In normal condition, it should be hot evenly.
If the compressor hums, clicks and immediately turns off, or is completely silent, the start-up relay or itself may have burned out. motor-compressor. Attempts to start it repeatedly can lead to final failure.
| Symptom | Probable cause | Nature of motor operation |
|---|---|---|
| Heat in both chambers | Freon leak | Works for a long time without turning off |
| The freezer is freezing, the refrigerator is not | Capillary clogged / Leakage | Cyclic operation |
| Temperature above normal | Sensor malfunction | Rare switching on |
| Humming and clicking | Start relay / Compressor | Startup attempt and shutdown |
To eliminate the leak, professional equipment is required: a vacuum pump, pressure gauges and a supply of freon. It is almost impossible to independently find the location of a leak in a sealed circuit without special instruments.
Clogged capillary tube
Another technical reason why refrigerator stops freezing is clogged capillary tube. This is a very thin copper pipe through which freon enters the evaporator. Over time, plugs from oil oxidation products or paraffin deposits may form inside.
Symptoms of a blockage are similar to a freon leak: the compressor works, but there is no cold. However, when clogged, the condenser is often completely cold, since the circulation of the refrigerant is impaired. The pressure in the system drops, and the cooling efficiency tends to zero.
Removing a blockage is a complex procedure. The technician needs to “push” the system with nitrogen under high pressure or replace the entire capillary tube. After this, the system must be completely recharged with refrigerant.
Influence of external factors and operating conditions
Do not forget that the operation of the refrigerator is influenced by the conditions in which it stands. If the equipment is installed close to a wall or in a niche without gaps for ventilation, condenser doesn't have time to cool down. This leads to overheating of the compressor and a decrease in cooling efficiency.
The ambient temperature is also critical. Most refrigerators are not designed to operate in unheated rooms at temperatures below +5°C or above +35°C. In cold weather, the oil in the compressor thickens and it may not start, and in extreme heat the system cannot cope with heat removal.
Check whether the refrigerator is located next to a heat source: a radiator, stove, or in direct sunlight. Local overheating of one of the sides of the case disrupts the thermodynamic cycle.
⚠️ Attention: Installing the refrigerator in a room with a temperature below the permissible temperature (indicated in the passport, usually +10°C) may lead to refusal of warranty service, since this is a violation of operating conditions.
Frequently asked questions (FAQ)
Why does the refrigerator hum, but does not freeze?
Humming means that the motor is trying to work. If there is no cold, most likely there is a freon leak, the system is clogged, or the compressor is broken (does not create the required pressure). Diagnostics by a specialist is required.
Is it possible to use a refrigerator if it does not freeze?
For a short time - yes, but you cannot store food in it. Prolonged operation of a faulty unit (especially with a leak or blockage) leads to overheating and combustion of the compressor, which makes repairs economically unfeasible.
How long does it take to defrost the refrigerator for checking?
For complete defrosting and evaporation of moisture from hard-to-reach places, a minimum of 24 hours is required. The minimum time after which you can turn on the device is 12 hours, but it is better to wait a day.
Why is there ice in the freezer, but warm in the refrigerator?
This is a classic sign of a freon leak (most often in the foamed part of the housing) or a malfunction of the No Frost system (the fan does not work or the air supply channel is clogged).
What to do if the refrigerator turns on for 10 seconds and turns off?
The thermal protection relay is triggered. Reasons: the start relay is faulty, the compressor is jammed or the motor winding is burned out. It is necessary to disconnect the device from the network and call a specialist.