The situation when you open the refrigerator door and it’s warm inside always takes you by surprise. The products begin to deteriorate, an unpleasant smell appears, and panic arises: call a specialist or try to figure it out yourself? If your the refrigerator does not freeze, this does not always mean a fatal breakdown of the unit. Often the reason lies in small things that can be easily fixed without special tools.
The first thing to do is listen to the operation of the motor. Is it buzzing? Is there a sound of running water or clicking sounds? Inverter Models can operate almost silently, but traditional units make a characteristic noise when the compressor is running. Lack of cold when the engine is running and the engine not running are two fundamentally different scenarios that require different approaches to diagnostics.
In this article we will look at the main reasons why refrigerator compartment or the freezer stopped performing its functions. We will look at both simple operating errors and complex technical faults that require professional intervention. Understanding the principles of operation will help you save time and money, as well as correctly assess the scale of the disaster.
Primary diagnostics: light, sound and temperature
Before you grab the tools, conduct a visual and auditory inspection. Is the light inside lit? If yes, then there is electricity in the outlet, and the problem is not knocked out plugs. If there is no light, check the power cord and the outlet itself by connecting another device there. Sometimes thermostat it can be accidentally turned to the "0" or "Off" position, which completely turns off the cooling.
Pay attention to the nature of the compressor operation. If it does not start at all and is silent, the protection may have tripped or the starter protection mechanism has failed. If the engine hums but does not start, or starts and after a couple of seconds clicks and goes silent, these are signs of problems with the start relay or the compressor itself. In the case of No Frost systems, it is important to check that the vents are not clogged with food, blocking air circulation.
⚠️ Attention: If you smell a burning smell or see sparking in the compressor area or wiring, immediately unplug the appliance. Further operation may result in a fire.
Check the door for tight fit. Rubber seal over time, it dries out, cracks, or simply becomes contaminated with grease, which is why the door does not close hermetically. Warm air constantly enters inside, and the unit does not have time to cool it, running idle. A simple test with a sheet of paper clamped around the perimeter of the door will help identify weak points in the seal.
Electrical problems: thermostat and start relay
One of the most common reasons why the refrigerator stops freezing is the failure of the thermostat. This device is responsible for turning the compressor on and off depending on the temperature inside the chambers. If the thermostat is “stuck” in the open state, the signal to start the engine simply does not arrive. In models with electronic control, this function is performed by temperature sensor, which can also malfunction.
The second important element is the start-up relay. It is located next to the compressor and provides the necessary impulse to start the engine. If the relay is burned out or its contacts are oxidized, the compressor will either not start at all, or will hum, trying to start, but immediately turn off due to protection. Replacing a relay is an inexpensive procedure and is often performed by craftsmen at home in 15-20 minutes.
Diagnostics of these components requires a multimeter. It is necessary to “ring” the contacts for short circuits or breaks. If you do not have the skills to work with electrical appliances, it is better not to go inside the electrical circuit, as there is a risk of getting an electric shock or permanently damaging the electronic module controls.
Refrigerant leak: why the freon disappeared
Refrigerant (freon) is the “blood” of the refrigerator, circulating through a system of tubes and evaporators. In a working unit, it does not go anywhere and does not require refueling for years. If you notice that the refrigerator does not freeze, and the motor runs almost non-stop (or turns on very rarely if it is an inverter), there is a high probability of a leak.
A leak can occur in several places:
- 🔹 At the welding site copper tubes (factory defect or vibration).
- 🔹 In the evaporator, if it was damaged with a knife during defrosting or cleaning.
- 🔹 In the foamed part of the body, where the tubes have been corroded.
- 🔹 Through the condenser (black grille at the back), if it broken by rust.
It is difficult to diagnose a leak visually, since freon is a colorless and odorless gas. An indirect sign may be swelling of the refrigerator wall (in the place of the foamed evaporator) or the appearance of oily spots under the unit (oil comes out along with the gas). Also, frost may appear on the tubes only at the beginning of the circuit, and then the usual temperature will continue.
To eliminate this malfunction, you will need to call a technician with equipment: a leak detector, a vacuum pump and a gas station. It is almost impossible to find a microcrack and solder the system on your own without experience. After eliminating the leak, the system must be evacuated, removing moisture and air, and only then refilled with a new portion of refrigerant strictly by weight.
Malfunctions of the No Frost and defrost system
In refrigerators with the system No Frost (or Low Frost) lack of cold is often associated with problems in the defrosting system. In such units, cold is produced in the freezer compartment and dispersed by a fan throughout the refrigeration compartment. If the evaporator is overgrown with a “coat” of ice, the fan cannot expel the air, and the chambers become warm.
A chain of parts is responsible for the defrosting process:
- ❄️ Defrosting heating element —a heating element that melts the ice.
- ❄️ Defrost sensor - informs the module that there is no ice and heating can be stopped.
- ❄️ Timer or control module - gives a command to turn on the defrost mode.
- ❄️ Thermal relay - protects the heating element from overheating.
Most often the heating element itself burns out or the sensor fails. As a result, the ice does not melt and a huge lump builds up, which blocks the operation of the fan. You may notice that the fan is humming or crackling as it tries to break through the ice jam, or it is just standing still. Visually, this manifests itself in the form of ice on the back wall of the freezer or in the fan niche.
To repair, you need to defrost the refrigerator (at least 24 hours, until the water has completely drained), then check the resistance of the heating element and sensors with a multimeter. If the heating element rings (has resistance), but the sensor does not, we change the sensor. If the heating element is broken, we change it. It is also important to check whether the drainage holes through which water flows into the evaporation tank are clogged.
☑️ Diagnostics No Frost
Compressor: the heart of the refrigerator
The compressor is the most expensive and important component of the unit. If the diagnostics showed that the electrics are working properly, the freon is in place, the defrosting system is working, but there is still no cold, the problem may lie in the mechanical part of the motor. The compressor may work, but not create the necessary The main symptoms of a compressor malfunction: pressure for gas circulation.
The main symptoms of a compressor malfunction:
| Symptom | Probable reason | Solution |
|---|---|---|
| The engine hums, but does not start | Piston group jamming | Replacing the compressor |
| Works, but does not cool | Valve wear, no compression | Replacement of the compressor |
| Gets very hot and turns off | Interturn short circuit of the windings | Replacing a compressor |
| Loud knocking during operation | Broken bearings or bushings | Replacing a compressor |
Replacing a compressor is a complex technological process. It requires cutting off old pipes, soldering new ones, installing a filter-drier, evacuating the system and charging with freon. This can only be done efficiently in a workshop or with a visiting specialist with a full set of equipment. "Homemade" replacement often leads to repeated breakdowns after a few months.
⚠️ Attention: When replacing the compressor, be sure to change the filter drier. The old filter is already saturated with moisture and will not be able to protect the system from the formation of ice plugs and acids that will destroy the new motor.
The capillary or filter drier is clogged
Sometimes the compressor is working, the freon is in place, but the gas circulation is impaired. This occurs if a blockage forms in a narrow capillary line or in the filter drier. The reason may be moisture that has entered the system (for example, during a poor-quality previous filling), which freezes in the form of an ice plug, or oxidation products and dirt that clog the passage hole.
Signs of blockage:
- 🛑 The compressor works constantly, trying to pump gas.
- 🛑 The condenser (grid at the back) is only partially cold or warm.
- 🛑 Frost may be visible at the site of the blockage or, conversely, the tube will be hot.
- 🛑 The pressure at the outlet of the compressor is high, and there is a vacuum at the inlet.
There is only one treatment: purging the system with nitrogen under high pressure, replacing the filter drier and refilling. In some cases, if the blockage is caused by oil breakdown products (acids), a complete flushing of the system with special solvents is required, which only professionals can do.
When you really need a specialist, and when you can do it yourself
Refrigerator repair is a balance between the desire to save money and the risk of completely ruining the equipment. If the problem is a burnt out light bulb, a dirty seal, or an incorrectly set thermostat, you can easily fix it yourself. The user can also replace the start relay (if it is external) or the defrost heating element, having minimal skills and a multi-component.
However, there are situations when calling a specialist is necessary:
- 🔧 Soldering of pipes and working with freon is necessary.
- 🔧 The compressor needs to be replaced.
- 🔧 A leak has occurred in the foamed part of the housing.
- 🔧 The electronic control module has burned out (reflashing or complex soldering is required).
Remember that opening it yourself refrigeration circuit (pipes with freon) without a license and equipment is prohibited by environmental standards in many countries, since the release of refrigerants into the atmosphere is harmful. In addition, inept soldering can lead to a fire hazard.
Why does the refrigerator freeze but does not turn off?
This is a sign that the unit cannot reach the set temperature. Reasons: freon leak, capillary clogged, compressor wear, door not closed tightly, or room temperature too high. The motor wears out, trying to compensate for the lack of cold.
Is it possible to operate a refrigerator if it does not freeze well?
Short-term - yes, but food can spoil. Long-term operation in this mode is dangerous for the compressor, which overheats while working without interruption. This can lead to its complete failure.
How long should the refrigerator cool down after defrosting?
After complete defrosting (24 hours), the refrigerator requires 2 to 4 hours of operation without loading food to reach operating mode and freeze the empty chambers. It is better to load products gradually.
Does the installation level affect the operation of the refrigerator?
Yes. If the refrigerator is not level, the door may not fit tightly, breaking the seal. In addition, misalignment can cause improper operation of the compressor and increased noise. Adjust the legs so that the body is strictly vertical.