The situation when the main compartment of the refrigerator continues to cool food, and in the freezer the temperature rises to positive values, is one of the most common and alarming for owners of household appliances. Unlike a complete failure of the unit, such a failure often misleads users, as the lights are on, the fan is humming, and a false impression is created that the system is working. However, ignoring this problem in the first hours can lead to complete damage to inventory and costly repairs.
The reasons for this behavior refrigeration equipment can be hidden in both simple mechanical malfunctions and complex malfunctions compressor-condensing unit. Understanding the operating principle of dual-circuit and single-circuit systems will help you quickly diagnose a breakdown. In single-circuit models, cold is transferred from the freezer to the refrigeration compartment, so a breakdown there often stops cooling everywhere, but in systems No Frost or two-compressor models, failure scenarios can be different.
Before calling a technician, it is necessary to conduct an initial diagnosis, eliminating external factors. Often the problem is solved without opening the case and using a complex tool. It is important to listen carefully to the sounds of the running motor and check for frost on the back wall or evaporator. In this material, we will analyze in detail the algorithm of actions that will help you make the right decision.
Primary diagnosis: checking simple causes
The most commonplace, but common reason for the lack of cold in the freezer is a leak or improper operation. If the chamber door does not fit tightly due to adhered ice, crumbs or a skewed hinge, cold air constantly escapes. The compressor, trying to compensate for the loss of temperature, wears out, but cannot achieve the set parameters. Visually, this can manifest itself as a “fur coat” on the seal or ice freezing in the corners of the chamber.
The second important aspect is the mode of operation and settings. Accidentally lost settings in the electronic control unit could switch the refrigerator to “Vacation” mode or simply change the target temperature. On electronically controlled models, it is worth checking to see if the alarm indicator is lit. Also make sure that the products in the chamber do not block the exit of cold air from the air ducts, which is especially important for systems Total No Frost.
Pay attention to the location of the equipment. If the refrigerator is placed close to the wall or in a niche without gaps, the air circulation around the condenser (the grille at the back) is disrupted. This causes the compressor to overheat and reduce cooling efficiency, primarily affecting the freezer compartment. The minimum distance to the wall should be at least 5-7 cm.
Check the integrity of the rubber door seal. If it is stretched, torn or contaminated with grease, the seal is compromised. Wipe the seal with a soft cloth and soapy water and check the seal around the entire perimeter. Often, simple cleaning and alignment of the seal solves the problem of loss of cold.
Problems with the defrosting system in No Frost models
In refrigerators with the system No Frost moisture contained in the air settles on the evaporator, hidden behind the back panel of the freezer. Periodically, this ice must thaw thanks to a heating element (heating element). If the water drainage system or the defrosting process itself is disrupted, the evaporator becomes surrounded by an ice cocoon. This ice blocks the channels through which cold air should enter the chamber, creating the illusion of a compressor breakdown.
The key elements of the defrosting system are Evaporator heating element, defrost sensor and defrost timer (or electronic module). If the heating element burns out, the ice does not melt. If the timer jams, the defrost mode does not turn on. If the sensor is faulty, the control module “does not know” that it is time to heat the evaporator. As a result, the fan hums, but cannot drive air through the ice plug.
⚠️ Attention: Trying to peel off the ice yourself with a knife or sharp objects from the evaporator in No Frost systems is strictly prohibited. You can damage the thin evaporator tubes or the heating element itself, which will lead to freon leakage and expensive repairs.
You can diagnose a “crying” evaporator by removing the back plastic panel in the freezer (after defrosting the refrigerator). If you see a thick layer of ice or snow on the radiator, the problem is in the defrost unit. In this case, the burnt element needs to be replaced: most often the heating element itself or the fuse fails.
How to check the defrosting heating element with a multimeter?
To check, you need to ring the heating element with a multimeter in resistance measurement mode. If the device shows a break (infinity), it means that the spiral has burned out and requires replacement. Normal resistance is usually from 200 to 400 Ohms, but the exact values depend on the model of the refrigerator.
Refrigerant leakage: signs and consequences
One of the most serious reasons why The refrigerator is running (buzzing and glowing), but not freezing, is a leak Freon (refrigerant). The refrigerant circulates in a closed circuit, taking heat from the chambers and releasing it into the environment. If a microcrack appears in the tubes, the gas gradually evaporates. The compressor continues to run idle, trying to pump what is no longer enough in the system.
Leakage often occurs in places where pipes are soldered or in the foamed part of the housing (in a foamed evaporator), which makes visual detection of the damage site impossible without special equipment. Indirect signs of a leak are: quiet operation of the compressor (it does not reach full power due to lack of pressure), hot side walls (or vice versa, lack of heating where it should be) and lack of cold when the engine is running.
The restoration process in this case is complex and requires the qualifications of a specialist. It is necessary:
- 🔍 Find the leak using a leak detector or nitrogen pressure testing.
- 🔧 Eliminate the damage (solder the tube or replace the section).
- 💨 Evacuate the system to remove moisture and air.
- ❄️ Fill the refrigerator with the exact amount of freon indicated on the nameplate.
It is impossible to repair the leak and refill the refrigerator yourself without professional tools and skills. Attempts to “refuel” the system without looking for a leak will only give a temporary effect, since the gas will again escape through the existing hole.
Faults of the compressor and start relay
The compressor is the “heart” of the refrigerator. If it is faulty, the refrigerant circulation is disrupted. However, in a situation where the main chamber is working but the freezer is not, most often we are talking about a loss of compressor performance. The motor may hum, but not create the necessary pressure to pump freon through both circuits (in dual-circuit systems) or along the entire length of the tubes.
A frequent cause of startup failure or unstable operation is start relay. This small element is responsible for starting the compressor engine. If the relay contacts burn out or the coil fails, the compressor either does not start at all (a clicking and humming noise is heard) or operates jerkily. In some cases, the relay can become stuck, allowing the compressor to run continuously without shutting down, leading to overheating and failure.
Replacing the start relay is one of the few operations that can be done independently if you have basic skills. The relay is usually mounted on the side or rear of the compressor and can be removed with a simple movement. However, before replacing, you need to make sure that the compressor itself does not “stick” mechanically.
☑️ Compressor diagnostics
If the compressor is hot, vibrates strongly and makes a metallic knock, an interturn short circuit of the windings or mechanical wear of the piston group has probably occurred. In this case, a complete replacement of the unit is required, which is an expensive procedure comparable in price to the purchase of a new middle-class refrigerator.
Clogged capillary tube
The capillary tube is a thin copper pipe that serves as a choke in the system, creating a pressure difference between the high and low circuit. Over time, a blockage may form inside the tube. The cause may be moisture that has entered the system due to poor filling (an ice plug is formed), or oxidation products of oil and freon (paraffin plug).
Symptoms of a clogged capillary tube are very similar to a freon leak: the compressor works constantly, there is no cold or it is weak, the condenser (grid at the back) is only partially warm or cold. The pressure at the outlet of the compressor increases, and at the inlet to the evaporator it drops, the circulation stops. Often, the compressor becomes very hot.
To remove the blockage, technicians use the method of purging the system with nitrogen under high pressure. If this does not help, you have to cut out a piece of the tube or change the filter drier, which is often where dirt accumulates. The filter drier must be changed whenever the refrigerant circuit is opened.
| Symptom | Probable cause | Difficulty of repair | Required tools |
|---|---|---|---|
| Ice on the evaporator behind the panel | Malfunction of the defrost system (heating element, sensor) | Average | Multimeter, screwdrivers |
| Compressor hot, cold no | Freon leak or blockage | High | Pressure gauges, vacuum sealer, burner |
| Clicks and buzzing, no start | Starter fault relay | Low | Screwdriver, multimeter |
| Noisy operation, vibration | Compressor wear | High | Soldering kit, keys |
When you need to call a professional technician
Despite the desire to save money, there are situations when the intervention of an unskilled user can turn a repairable breakdown into a complete disposal of equipment. If you determine that the problem lies in the sealed circuit (leakage, blockage) or the compressor needs to be replaced, calling a specialist is required. These works require a license to work with freons and special equipment.
Also, a technician should be called if, after simply defrosting and checking the seals, the problem does not disappear within 24 hours. Long-term operation of the refrigerator in abnormal mode (without cold) leads to degradation of the oil in the compressor and its failure. The faster the cause is eliminated, the higher the chance of saving the main unit.
⚠️ Attention: Do not try to solder the copper tubes of the refrigerator yourself without vacuuming the system. The entry of moisture or air into the circuit will lead to the formation of acids and rapid failure of the compressor within several months.
A professional technician has diagnostic equipment that allows you to accurately determine the pressure in the system, the current consumption of the compressor and the presence of leaks. This eliminates the “poke” method and replacing expensive components at random. In addition, service centers provide a guarantee on work performed and replaced parts.
Prevention and extension of service life
So that the situation when the freezer has stopped freezingdoes not take you by surprise, it is important to follow the operating rules. Regular defrosting (even for No Frost systems, it is recommended to do a preventative shutdown for a day once a year) helps maintain the elasticity of the seals and remove dirt from hard-to-reach places.
Keep the condenser grill at the back of the refrigerator clean. The accumulation of dust and pet hair acts as a heat insulator, preventing heat transfer. This forces the compressor to work longer and harder, reducing its life. Cleaning with a vacuum cleaner or soft brush once every six months is an excellent habit.
Do not put hot food into the chamber. This creates excess moisture, which condenses and freezes, stressing the defrost system. Also, do not overcrowd the freezer, leave space for air circulation between products.
Remember that modern technology is complex, but its logic work is one. Attentive attention to the first signs of malfunction (extraneous noise, changes in operating hours, ice) allows you to eliminate the problem at an early stage, preserving your products and budget.
How long can a refrigerator operate with a non-working freezer?
Without risk to the compressor - no more than a few hours. However, food in the freezer will begin to spoil after 4-6 hours if the door is opened frequently. If the freezer does not freeze due to a freon leak, long-term operation of the compressor “dry” can lead to its combustion in 1-2 days.
Is it possible to use a refrigerator if only the freezer does not freeze?
You can use the main compartment, but with caution. If the cause is a freon leak, then over time the cold will disappear in the refrigerator compartment. If the problem is in the No Frost defrost system, then the humidity in the main compartment may increase, which will lead to spoilage of vegetables and fruits.
Why did the freezer work after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrost system (the heating element or timer burned out) or the presence of a micro-leak of freon. Defrosting temporarily removes the ice plug or returns the pressure to normal, but does not eliminate the breakdown of the mechanism. Diagnosis and replacement of the defective part is required.
What does humming without cooling mean?
If the refrigerator is humming but not cooling, it means that the compressor is working, but is not creating compression. Reasons: freon leak (gas gone), capillary tube clogged or loss of performance of the compressor itself (valve wear). You need to call a technician.