The situation when you open the door of a household appliance, and room temperature is felt inside, can cause panic in any home cook. Products begin to deteriorate, stocks are destroyed, and there is a strong desire to immediately call a technician or buy new equipment. However, problem does not always mean a fatal failure of an expensive unit.
In most cases, the reason lies in small things that can be fixed independently in a few minutes, or in specific operating modes that the user might have forgotten about. Understanding the principles of operation compressor system and refrigeration supply will help you quickly diagnose the problem and make the right decision on further actions.
Before sounding the alarm, it is necessary to carry out a primary visual diagnostics and exclude the most trivial factors. It often turns out that the device is working properly, but its operating conditions are violated or the thermostat settings are lost.
Primary diagnostics: modes and settings
The most common reason why a refrigerator stops freezinglies in accidentally changed settings. The user may touch the temperature control when mopping, or children may play with the control panel. In modern models with electronic control, the failure could have occurred due to a power surge in the network.
Check whether the mode Super Freeze or, conversely, the “Vacation” mode is activated. In the first case, the freezer works hard, freezing food, but the main chamber may temporarily not get cold due to the redistribution of resources. In the second case, the refrigerator is specially switched to an economical mode, in which the main chamber is not cooled, in order to prevent the appearance of mold during a long absence of the owners.
⚠️ Attention: If you have a model with one compressor and the No Frost system, impaired air circulation due to clogged ventilation holes can simulate a compressor breakdown. Check to see if you have placed the food shelves close to the back wall.
You should also pay attention to the tightness of the door. If seal (the rubber around the perimeter of the door) is worn out, dirty, or the door is simply not completely closed, warm air constantly flows inside. In this case, the compressor works non-stop, trying to compensate for the heat, but due to overheating, the thermal protection may work and it will temporarily turn off.
Problems with the compressor and start relay
If the settings are in order, the next step is to analyze the operation of the "heart" of the refrigerator - the compressor. It is this unit that is responsible for circulating the refrigerant through the system. To understand what is happening, you need to listen to the sounds coming from behind or from below the unit.
Normal operation is characterized by a smooth hum of the motor. If you hear the compressor struggle to start, make a clicking sound and then go silent, or the hum is intermittent and loud, this indicates a starting problem. Often the culprit is starting relay, which is responsible for supplying a starting pulse to the motor windings.
- 🔊 Clicks and silence: The motor hums for 2-3 seconds, a click is heard, and there is silence. This is a classic sign of a faulty start relay or jammed compressor.
- 🔥 Strong heating: If you touch the motor housing (be careful, it may be hot!) and it is hot, an inter-turn short circuit of the windings may have occurred.
- 🌀 Continuous operation: The engine hums without interruption, but there is no cold. This may indicate a loss of performance of the piston group or a freon leak.
In some cases, the compressor may be operational, but not receive a start command from thermostat or the electronic control module. Diagnosing an electrical circuit requires a multimeter and certain skills, so if you are not confident in your abilities, it is better not to go inside the electrical panel.
Is it possible to replace the relay yourself?
Yes, if you have the skills to work with tools. The start relay is a small box that fits onto the compressor rod. It is important to buy exactly the same model (the marking is usually indicated on the body), since they differ in cut-off current and connection type. Before replacing, be sure to disconnect the refrigerator from the network!
Refrigerant leak and capillary blockage
These two technical faults often go hand in hand in the list of symptoms when the refrigerator turns on, but does not freeze. Freon (refrigerant) is the working fluid of the system, which, evaporating and condensing, transfers heat from the chamber to the outside. If its amount in the system decreases, the cooling efficiency drops to zero.
A leak can occur anywhere in the circuit: in the foamed part of the housing, in the condenser (grid at the back) or in the evaporator. Often the cause is metal corrosion or mechanical damage due to careless defrosting with a sharp object. Clogged capillary tube occurs due to moisture or debris entering the system, which blocks gas circulation.
| Symptom | Probable cause | Characteristic symptom |
|---|---|---|
| The refrigerator is silent | Freon leak | The compressor does not turn on because there is no pressure to start the sensor |
| Humming continuously | Leak or blockage | The motor is working hard, trying to gain temperature, but to no avail |
| It freezes only at the back wall | Lack of freon | There is only enough cold for the beginning of the evaporator circuit |
| Partially hot condenser | Clogged system | The heat exchanger heats up only at the beginning, followed by a cold pipe |
It is practically possible to diagnose a leak visually impossible unless it's a huge hole. The technician uses a leak detector or a method of painting the system under pressure. It is impossible to fix the leak and fill the refrigerator with freon without special equipment (vacuum pump, scales, pressure gauge station). freon without special equipment (vacuum pump, scales, pressure gauge station) is impossible.
⚠️ Attention: Freon is a chemical substance that can be dangerous under certain conditions. In addition, improper refueling or the entry of air and moisture into the system will permanently damage the compressor. Repairing the refrigeration supply system is a task for professionals.
Faults in the No Frost system
In refrigerators with the No Frost system (or Low Frost), cooling occurs not directly from the walls, but through the circulation of cold air. The fan and defrost system are responsible for this process. If one of these elements fails, the cold stops flowing into the chambers, although the compressor may work properly.
The most common problem is the formation of an ice coat on the evaporator, which is hidden behind a plastic panel inside the freezer or refrigerator compartment. Ice blocks the fan, and air simply cannot move through the channels. This occurs due to a breakdown The defrost heating element, a malfunction of the timer or defrost sensor.
- ❄️ The fan does not spin: It could have been blocked by ice, or the motor winding has burned out. You can check by getting to it and checking the rotation manually (with the power off!).
- 🌡️ Sensor temperature: If it is "lying", the control module may not give the command to turn on the heating element for defrosting, which leads to ice fouling.
- 🕰️ Defrost timer: Mechanical or electronic element that switches the “cooling” and “defrosting” modes. Its jamming stops the cycle.
Diagnostics often require partial disassembly of the inside of the chamber. If you notice that little or no air flow is blowing from the air ducts, most likely the problem is in the circulation system or its icing.
☑️ Diagnostics No Frost
The influence of external factors and operation
Sometimes the reason that the refrigerator does not freezelies not in the breakdown of parts, but in environmental conditions or improper use. The equipment is sensitive to room temperature, location and even the quality of the power supply.
If the refrigerator is standing close to the wall or in a niche where air circulation around the condenser is disrupted (grids at the back or on the sides), it begins to overheat. Heat transfer efficiency drops and the system cannot cope with cooling. It is also critical that the device sits level; misalignment can interfere with the normal closing of doors and the operation of the compressor oil system.
Low voltage in the network is the scourge of many areas. If the voltage drops below 190-200 volts, the compressor motor may hum but not start, or may operate at low performance. In such cases voltage stabilizer becomes a necessity, not a luxury.
When you need to call a specialist
There is a clear boundary between what you can do with your own hands and when intervention by a specialist with equipment is required. If after checking the settings, defrosting for 10-12 hours and cleaning the ventilation holes, the problem does not disappear, most likely there is a technical malfunction.
Replacing a compressor, finding and soldering freon leaks, replacing the filter-drier and refrigerant charging are complex technological processes. They require a license, special tools and knowledge. An attempt at self-repair in these cases often leads to increased cost of restoration or complete destruction of the unit.
⚠️ Attention: If you smell burnt wiring or see sparking in the compressor area, immediately unplug the device and do not try to turn it on again until the technician arrives. This may be a sign of a starting fire.
It is also worth considering calling a specialist if your refrigerator is more than 10-12 years old and has a serious breakdown (for example, a compressor burned out). In such cases, the cost of repairs, taking into account labor and spare parts, can be 70-80% of the cost of a new device, and it is more economically feasible to consider purchasing new equipment.
Why does the refrigerator freeze but does not turn off?
This may be a sign of a freon leak (the compressor cannot reach the desired temperature and runs constantly), a clogged capillary system, or a malfunction of the thermostat that does not signal to turn off. Also, the reason may be the wear of the door seal, through which heat constantly flows.
Is it possible to use a refrigerator if it does not freeze well?
It can be used, but with caution. Products can deteriorate faster, and constant wear and tear on the compressor will lead to its rapid failure. In addition, excess moisture may form in the freezer, which will turn into ice.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require regular defrosting to remove ice, as this happens automatically. However, once every 6-12 months it is recommended to carry out a complete defrosting and washing to remove bacteria, odors and check the drainage hole for blockages.
What to do if after defrosting the refrigerator still does not freeze?
If after 10-12 hours of defrosting (with the doors open) and then turning it on for 2-3 hours, the cold does not appear, then there is a problem is of a technical nature. Most likely, there is a freon leak, a blockage, or a breakdown of the compressor/control module. Diagnostics by a specialist is required.