The situation when the refrigerator stops freezing properly often develops gradually, and the owners notice the problem only when the food begins to spoil. This may occur due to natural wear and tear of parts, violation of operating rules, or hidden technical defects. Understanding how to determine whether a refrigerator is freezing or notis the first and most important step before calling a technician, since sometimes the problem is solved by simple adjustment or defrosting.
Diagnostics does not begin with disassembling the unit, but with careful observation of its behavior and the state of the internal space. It is important to distinguish temporary malfunctions in the thermostat from serious breakdowns compressor or leaks freon. Ignoring the first symptoms can lead to complete breakdown of expensive equipment.
In this article we will analyze in detail the algorithm for checking the performance of your refrigeration unit, consider typical signs of malfunctions and explain what details you should pay attention to first.
Visual assessment of the condition of products and internal space
Primary diagnostics always begin with an inspection of the contents of the chambers. If you notice that the milk is souring faster than usual, and the ice cream has become soft, this is a direct signal of a violation of the temperature regime. However, do not panic ahead of time: sometimes the problem lies in overloading the shelves or improper placement of products that block the access of cold air.
Pay attention to the formation of condensation and ice crust. In modern models with the system No Frost ice on the back wall or bottom of the chamber is unacceptable and indicates a clogged drain hole or a malfunction of the defrost system. In devices with a drip system, a thin layer of frost on the back panel is the norm, but if it turns into a thick “fur coat,” it means that thermostat is not working correctly.
- 🧊 Check the hardness of frozen foods: the meat should be rocky, not soft.
- 💧 Inspect the bottom of the refrigerator compartment for puddles or sticky deposits.
- ❄️ Assess the uniformity of cooling: measure the temperature in different corners of the chamber.
- 🔊 Listen to sounds: gurgling or complete silence may be symptoms.
⚠️ Attention: If you notice bulging lids on jars or a strong unpleasant odor, immediately discard the spoiled products. Long-term storage in incorrect conditions is dangerous to health.
It is also worth checking the condition of the rubber seals on the doors. If they are worn, cracked or do not fit tightly, cold air will escape and the compressor will idle trying to compensate for the losses. A simple test with a sheet of paper will help identify leaks: hold the sheet of paper in the door and try to pull it out; if it comes out easily without resistance, the seal requires replacement or adjustment.
Analysis of compressor operation and sound signals
Sound accompaniment of refrigerator operation is an important diagnostic tool. A working unit emits a uniform low-frequency hum, which periodically subsides when the engine reaches the set temperature and turns off. If you hear that motor-compressor hums constantly without turning off, or, conversely, is silent, although the chamber is warm, these are clear signs of a malfunction.
Extraneous sounds should also become alarming: clicks, hissing, gurgling or loud knocking when launch. Clicking noises often indicate problems with the start relay, which is unable to start the engine. Hissing may indicate a refrigerant leak, and gurgling may indicate the circulation of freon in the system, which is normal only in certain operating cycles, but should not be constant.
Check the temperature of the compressor housing (usually located at the bottom rear). If it is hot to such an extent that it is impossible to touch it, or, conversely, is absolutely cold while the engine is running, this requires immediate intervention from specialists. Overheating is often caused by overload or contamination of the condenser, and a cold motor when the light is on indicates its failure.
Checking the defrosting system and evaporator
One of the common reasons why the refrigerator stops freezing is a malfunction of the defrosting system, especially in models No Frost. If the evaporator hidden behind the back panel is covered with a thick layer of ice, the fan cannot move cool air through the chamber. As a result, the refrigerator compartment is warm, but there may be a block of ice in the freezer.
Diagnostics often require partial disassembly: removing the plastic panel in the freezer compartment. If you see that evaporator is completely clogged with snow, and the defrost heating element or timer does not work, the system cannot go into defrost mode. This leads to the fact that the air channels are blocked and the cold circulation stops.
It is also important to check the operation of the fan. In good condition, it should make noise when the doors are open (in some models) or work cyclically. If the fan blades are frozen to the ice or the motor is burned out, cold will not enter the chamber, even if the compressor pumps freon properly.
☑️ Diagnostics of the No Frost system
Often owners confuse a malfunction of the defrost system with a normal shortage refrigerant. However, if the evaporator freezes, the problem is precisely the air circulation, and not the absence of cold as such. Forcefully defrosting the refrigerator for 24 hours with the doors open may temporarily solve the problem, but if the defective part is not corrected, the ice will build up again within a few days.
Diagnosing refrigerant leaks and blockages
Leaking freon is an insidious problem that develops slowly. The gas is odorless and colorless, so it is impossible to detect it visually. The first sign is often that the refrigerator starts working longer, trying to gain temperature, or does not turn off at all, but does not freeze.
Another symptom is hot side walls. Normally, the sides of the case should heat up slightly, since there is a heat dissipation circuit there. If the walls remain cold while the compressor is running, this may indicate that the refrigerant has left the system or a blockage has formed in the capillary tube.
| Symptom | Possible cause | Compressor reaction | Condenser temperature |
|---|---|---|---|
| The refrigerator does not freeze | Freon leakage | Works constantly | Cold or partially warm |
| Weak cooling | Capillary clogged | Works with overload | Hot to the filter, then cold |
| Ice in the chamber | Sensor malfunction | Works cyclically | Normal |
| Shuts off after a minute | Compressor malfunction | Short cycles | Does not have time to heat up |
⚠️ Attention: Independent refilling of the refrigerator with freon is impossible without special equipment and skills. An attempt to add gas “by eye” or to use cans from car dealerships will lead to complete breakdown of the compressor.
Clogging of the capillary tube often occurs due to moisture in the system or oil wear products. In this case, the pressure in the system increases, the compressor hums more than usual, but the circulation of the refrigerant is disrupted. Diagnosis of a blockage requires a manometric manifold and evacuation of the system, which is performed only in service conditions.
Using a thermometer for accurate measurements
Subjective sensations (“it seems to have become colder”) are a bad adviser. The only objective way determine whether the refrigerator is freezing or not —use a household thermometer. Place a regular alcohol or digital thermometer in a glass of water and place it on the middle shelf of the refrigerator.
Leave the thermometer for at least 2-3 hours without opening the door at this time. After this, take your readings. For a refrigerator, the norm is considered to be a range from +2 to +6 degrees Celsius. If the temperature is above +8 degrees, food may spoil, and if below 0, it will begin to freeze.
In the freezer, the temperature should not be higher than -18 degrees Celsius. If the thermometer shows -10 or -12, then the freezer is working, but not at full capacity. This may be due to wear of the seal, low compressor performance, or lack of refrigerant.
It is important to take measurements during normal loading with products. An empty refrigerator gains temperature differently than a fully loaded one. Also avoid checking immediately after opening the door or loading warm food, as this will distort the results.
Electronic diagnostics and error codes
Modern models of refrigerators, such as LG, Samsung, Bosch or Indesit with electronic control, are equipped with a self-diagnosis system. If the unit stops freezing, an error code may appear on the display or the temperature indicator may begin to flash. These signals greatly simplify troubleshooting.
For example, an error indicating a malfunction of the evaporator temperature sensor will immediately direct the diagnosis in the right direction. However, it is worth remembering that electronics can also malfunction. Sometimes the control module “glitches” and a working refrigerator shows an error or does not turn on.
To reset the error, a reboot often helps: unplug the refrigerator for 10-15 minutes, and then turn it on again. If the problem was a software failure of the controller, operation will be restored. If the error recurs, it means that a specific component is damaged and requires replacement.
Some models do not have a display, but indicate a problem by flashing LEDs on the control panel. The decoding of such signals can be found in the user manual (section "Troubleshooting" or "Diagnostics"). Lack of response to the buttons when the backlight is on may indicate problems with the control board.
Frequently asked questions (FAQ)
Why does the refrigerator hum, but does not freeze?
This may indicate several problems: freon leakage (the compressor is running an empty system), compressor jamming (motor hums, but the shaft does not spin) or a malfunction of the start relay. Severe freezing of the evaporator is also possible when the fan cannot drive air.
How long does it take the refrigerator to gain temperature after defrosting?
Usually the process of reaching operating mode takes from 2 to 6 hours, depending on the volume of the chambers, the ambient temperature in the room and the number of loaded products. It may take up to 24 hours for the temperature to fully stabilize.
Can the refrigerator not freeze due to improper installation?
Yes. If the refrigerator is placed close to the wall, the ventilation of the condenser is impaired and it overheats. It is also critically important that the unit stands level: misalignment can cause the door valves and compressor to work incorrectly.
What to do if it is warm in the refrigerator compartment and ice in the freezer?
Most likely, the problem is in the air circulation system (for No Frost) or in a freon leak. Check if the air supply ducts are clogged with food. If the channels are free, diagnostics by a technician will be required.
How often do you need to defrost the refrigerator so that it freezes well?
Refrigerators with a system No Frost do not need to be defrosted (just washed). Models with a drip system are recommended to be defrosted when a layer of ice 3-5 mm thick forms, usually this happens once every 6-12 months.