The situation when refrigerator continues to buzz, the lights in the cells are on, but the food freezer begins to melt causes panic in any home cook. This is a classic symptom of poor refrigerant circulation or a malfunction in the temperature control system. Often equipment owners think that the problem lies in the compressor, but in practice the reasons can be much more prosaic and cheaper to fix.
Before calling a technician, it is necessary to carry out initial diagnostics to eliminate basic operating errors. Understanding how a dual-circuit or single-circuit system works will help you save time and money. In this article we will analyze the main ones, methods for identifying them and an algorithm of actions. If you notice that malfunctions, methods for identifying them and an algorithm of actions.
It is important not to leave equipment turned on with spoiled products, as this can lead to more serious damage to the electronics. If you notice that temperature indicator flashes or shows positive values, you need to act immediately.
Primary diagnosis and simple causes
The most common reason that freezer stopped freezing, lies in a violation of the tightness or operating modes. Check if the door fits tightly. If the seal (elastic band) is worn out, dirty or deformed, warm air constantly flows inside, and the unit does not have time to freeze it.
The second important point is the fast freezing mode. If you accidentally activated the Super Freeze or “Quick Freeze” function and forgot to turn it off, the compressor may work for wear, but due to overheating or a timer failure, the system will no longer cool properly. It is also worth checking that the ventilation holes inside the chamber are not blocked by food.
⚠️ Attention: If you have recently defrosted the refrigerator or transported it, be sure to let it stand turned off for 2-3 hours before turning it on. An attempt to start the compressor immediately may result in it jamming due to oil entering the system.
Make sure that the thermostat is set to the correct position. Sometimes children or pets may accidentally move the setting knob to minimum, causing it to stop. In modern models with electronic control, a power surge could occur that disrupted the settings. cooling. In modern electronically controlled models, a power surge may have occurred, disrupting the settings.
Problems with the defrosting system (No Frost)
In the system refrigerators No Frost frost constantly forms on the evaporator, which is automatically removed by heating elements. If this mechanism breaks down, the ice “coat” grows so much that it blocks the cold air supply channels into freezer compartment. As a result, the fan circulates air, but there is no cold.
The main culprits here are three elements: a defrost heating element, a defrost sensor or a timer. It is almost impossible to determine by ear which part has failed. However, if you hear that the fan is working intermittently or is making strange sounds, most likely, ice is interfering with its blades.
To check, you need to completely defrost the unit (at least 24 hours with the doors open). If after this the freezer worked normally, but a week later the situation repeated itself, the problem is guaranteed to be in the defrosting system. This confirms that heater or its controller does not perform its function on time.
☑️ Diagnostics of the No Frost system
Replacing the heating element or defrost sensor is a procedure of medium complexity, requiring disassembly of the back wall of the freezer. It is important to use original spare parts or high-quality analogues, since cheap heaters often burn out after a few months.
Faults of the compressor and start relay
The compressor is the heart of the refrigerator. If it's running but there's no cold, it could mean a loss of performance. The piston group could be worn out, and the compressor simply does not create the necessary pressure in the system. In this case, it may hum, but not pump freon.
A frequent cause of failure is the starting relay. This is a small part that fits onto the compressor contact. If the relay burns out, the motor hums for a few seconds, clicks and turns off. Sometimes careful cleaning of the contacts or replacing the relay with a new one helps, which you can do yourself.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor hums for 5-10 seconds and clicks | Faulty starting relay | Low (part replacement) |
| The compressor is hot, but does not start | Motor jammed or winding breakage | High (replacement compressor) |
| The compressor runs constantly without shutting down | Freon leakage or loss of performance | Medium/High |
| Strong vibration and noise | Destruction of the suspension compressor | Average |
If the compressor runs constantly without turning off, and at the same time temperature in the freezer is higher than normal, this is a sure sign of a refrigerant leak or “fatigue” of the motor. In both cases, the intervention of a specialist with a pressure gauge manifold is required.
Refrigerant leak and capillary blockage
Freon circulates in a closed circuit. If a microcrack has formed in the tubes (often due to corrosion or mechanical damage during cleaning), the gas gradually evaporates. First freezer it begins to freeze worse, then the cold disappears completely. It is difficult to detect a leak visually; it is often accompanied by the appearance of yellow rust spots on the rear grille.
Clogged capillary tube is the second common cause. Oil circulates in the system, which over time can thicken or mix with breakdown products, forming a plug. Freon cannot pass through the narrow cross-section, and circulation stops. A characteristic sign is a hot condenser (grid at the back) and a cold or barely warm compressor.
⚠️ Attention: Self-filling the refrigerator with freon without evacuating the system and replacing the filter-drier is prohibited. Residual moisture in the tubes will lead to the formation of acid and rapid failure of the compressor.
To eliminate these faults, a call to a technician is required. He will perform a nitrogen pressure test, find the leak, seal it, replace the filter and fill the system with the exact amount refrigerant. This is a complex technical process that requires special equipment.
Is it possible to refill the refrigerator yourself?
Theoretically, it is possible if you have soldering skills and pressure gauges. However, it is difficult to find the location of a microcrack without equipment. In addition, different models require different types of freon (R134a, R600a). An error in the dosage or type of gas will lead to breakdown of the compressor.
Failures in the electronic control module
In modern models with a system Full No Frost and a display on the door, the electronic module is responsible for all processes. If it is "glitchy", it may not command the compressor or fan to turn on, even if the sensors indicate a high temperature. This often happens after power surges in the network.
Symptoms of module failure may include: flashing indicators, lack of response to buttons, chaotic turning on and off of the unit. Sometimes a complete reset helps (disconnecting from the network for 15-20 minutes), but if the problem is a burnt-out microcircuit or relay on the board, you will need electronics repair.
Module diagnostics are carried out by testing the contacts and checking the output voltage. If the module is operational, but no signal is received, check the wiring and connections of the sensors. Oxidized contacts in connectors are a common cause of “glitches” in refrigerators located in damp areas.
When you need to call a technician
Not all breakdowns can be fixed with your own hands. If you have checked the seals, defrosted the unit, checked the socket and relay, but freezer it still does not freeze, it’s time to call a specialist. Delay can lead to damage to food and higher repair costs.
It is especially important to call a technician if:
- 🔧 You hear the smell of burning or burnt wiring.
- 🔧 The compressor does not start or works with a strong knock.
- 🔧 An oily coating is visible on the back wall (a sign of a leak).
- 🔧 The electronics do not respond to commands or show an error.
Professional repair includes not only replacing the part, but also checking the entire system for leaks. The master will also be able to give a guarantee for the work performed, which is impossible with independent repairs.
Prevention and proper care
In order refrigerator to serve for a long time, it is important to follow the operating rules. Do not load hot food into the chamber - this will place unnecessary stress on the compressor and lead to the formation of excess frost. Keep the drainage hole clean, if your model has one.
Regularly check the condition of the sealing rubber. Wipe it with a soft cloth to remove grease and crumbs. If the rubber has become hard or sticky, wipe it with a weak solution of vinegar or a special rubber care product.
Do not forget to clean the condenser (black grille at the back) from dust at least once every six months. Dust acts as a heat insulator, preventing the release of heat, which forces the compressor to work longer and more intensely, reducing its resource.
Why does the freezer not reach the temperature for a long time after defrosting?
After complete defrosting, the refrigerator takes time (from 2 to 8 hours) to reach operating mode. During this period, the compressor operates continuously. If after 12 hours the temperature has not dropped below -10°C, you may have damaged the system during defrosting or there was a power surge.
Can you use a refrigerator if the freezer does not freeze?
You can use a refrigerator if it keeps it cold, but storing food for a long time is not recommended. However, you cannot operate a unit with a faulty compressor or a freon leak - this will lead to permanent engine failure. It is better to turn off the equipment before the technician arrives.
How much does it cost to repair if the evaporator burns out?
The cost depends on the model, but replacing the evaporator (“crying” or in the foam) is one of the most expensive procedures, as it requires opening the case or replacing the entire back wall. Often repairs are not economically feasible for older models.
How to check if the defrosting heating element is working?
To check, you need a multimeter in resistance testing mode. You need to get to the heating element (usually behind the back wall of the freezer), disconnect the wires and measure the resistance. If the device shows “infinity” (break), the heating element has burned out and requires replacement.