A modern refrigerator is a complex technical device that works on the principle of refrigerant circulation, and its failure often becomes an unpleasant surprise for the owner. When the compressor hums and the food inside begins to rapidly deteriorate, the first thing the owner thinks about is a breakdown of the motor or thermostat. However, there is a hidden problem that cannot always be identified without special knowledge, and it is associated with depressurization of the cooling system.
You can understand that a leak of the working substance has occurred by a number of indirect signs that appear long before the unit completely fails. In this article, we will analyze in detail the physical processes that occur when the pressure in the circuit decreases, and we will help you accurately diagnose the condition of your equipment, be it Indesit, Atlant or LG.
The principle of operation and the role of the refrigerant in the cooling system
For the correct operation of refrigeration equipment, a continuous cycle of compression and expansion of the gas that transfers heat is necessary from the evaporator to the condenser. Refrigerant (often called freon in everyday life) is not a fuel that burns, but a working fluid located in a closed circuit. In good condition, its quantity remains unchanged for years, since the system is sealed.
If a microcrack has formed in the tubes or the factory connection has become loose, the pressure begins to drop. The compressor tries to compensate for this by working in increased mode, but the efficiency of heat transfer decreases sharply. It is important to understand that freon itself is not consumed during operation, and its “output” always means a violation of the integrity of the circuit.
Modern models use various types of gases, such as R600a (isobutane) or R134a. They have different physical properties, but the principle of their leakage is the same - the gas comes out, and air and moisture can get inside the system, which completely disables the equipment.
⚠️ Attention: Trying to simply “refuel” the refrigerator without finding and eliminating the leak is a waste of money. Gas will escape through the same hole again after a few days or weeks.
Depressurization often occurs in areas where pipes are soldered or in areas prone to corrosion. For example, in models with a foamed evaporator, cracks can occur inside the housing, which makes visual diagnosis almost impossible without opening the thermal insulation.
Main signs of freon leakage from the circuit
The first and most obvious alarm signal is a change in the temperature conditions inside the chambers. If you notice that food in the refrigerator has begun to deteriorate faster, and ice is melting in the freezer, although this has not been observed before, it is worth conducting a thorough check. The compressor can work almost non-stop, trying to reach the set temperature, but not being able to cope with the load due to a lack of refrigerant. The second important sign is the condition of the condenser (grids on the back wall or side panels). Normally, this grill should be warm or hot (depending on the model refrigerant.
The second important sign is the condition of the capacitor (grid on the back wall or side panels). Normally, this grill should be warm or hot (depending on the model Bosch or Stinol). If, when the engine is running, the grill remains cold or only slightly warm in one corner, this is a sure indicator that there is critically little gas in the system.
It is also worth paying attention to the cyclical operation of the engine. If there is a leak, the refrigerator may work for a long time, then stop for a short time and turn on again. Sometimes the operating intervals become chaotic, and the sound of the motor may change, becoming more strained or, conversely, quieter if the thermal protection has tripped.
- 🧊 The freezer has stopped freezing, the ice turns into water.
- 🔊 The compressor hums continuously or turns on too often at short intervals.
- 🌡️ Inside the main chamber, the temperature is higher than the set one, despite the maximum settings.
- 🔇 The rear grille (condenser) remains cold when the engine is running.
Visual diagnostics and search for external damage
Before calling a technician, you can try to independently inspect the accessible parts of the unit. Start with the back wall: carefully inspect the copper tubes and aluminum elements for mechanical damage. Leaks often occur due to inaccurate defrosting, when the evaporator was pierced with a sharp object evaporator.
Pay attention to the presence of oily stains. Freon circulates in the system along with compressor oil. If you see dark traces of oil on the tubes, near the compressor or on the floor under the refrigerator (for example, on models Haier or Candy), this is almost a hundred percent sign of depressurization in this place.
Pay special attention to the area of the door seals and the places where the tubes enter the housing. Corrosion can begin precisely where the metal comes into contact with moisture or aggressive environments. If you find blistering paint on the metal surfaces of the case, this may indicate a hidden leak inside the walls.
| Place to check | What to look for | Probability of leakage | Actions |
|---|---|---|---|
| Evaporator (inside) | Through holes, swelling | High | Requires professional repair |
| Pipes at the back | Oil stains, rust | Average | Processing and soldering |
| Compressor | Oil leaks, corrosion | Low | Replacement of unit or soldering |
| Floor under the refrigerator | Puddles of oil | Medium | Inspection of the bottom of the unit |
⚠️ Attention: If you find an oil stain, under no circumstances try to seal it with regular glue or sealant. The pressure in the system is high, and such materials will not withstand the load, but will only complicate subsequent professional soldering.
Compressor behavior and temperature anomalies
The refrigerator engine is the heart of the system, and its behavior says a lot about the condition cooling circuit. During normal operation, the motor turns on, heats up, turns off and rests. If freon leaks, the cycle is disrupted: the compressor can work “to wear out”, trying to achieve the impossible, or often click if the thermal protection relay is triggered.
Temperature anomalies are often local in nature. For example, in two-chamber refrigerators Samsung or Electrolux there may be a situation where the freezer is still cold, but the refrigerator compartment is already warm. This is due to the fact that the remaining gas circulates in a circle, but their volume is only sufficient for the first section of the evaporator.
Another sign is uneven heating of the condenser. Run your hand along the back grill: it may be hot at the top and cold at the bottom. In good condition, the heating should be distributed more evenly over the entire area of the heat exchanger, which indicates complete circulation of the substance.
Why is the compressor hot?
The compressor heats up due to friction of the piston group and gas compression. If freon leaks, the motor runs longer, trying to create pressure, which leads to overheating of the windings and housing. Prolonged overheating reduces the service life of the engine.
If you hear gurgling or hissing sounds inside the housing after stopping the motor, this may indicate that there is air or a mixture of gases remaining in the system, which is also a consequence of depressurization and moisture ingress.
Independent check of the system tightness
For a more accurate diagnosis at home, you can use a soap solution. This method is effective if the leak occurs in an accessible location, such as visible pipe joints or around the compressor. Prepare a thick soap foam and apply it to suspicious areas.
If inflating bubbles appear at the application site, it means that gas is escaping under pressure. This method is good for finding large holes, but is powerless against microcracks, which are often found in foamed evaporators of modern models LG or Beko.
You can also use electronic leak detectors, which are sold in specialized stores. These devices react to the presence of refrigerant molecules in the air and sound an alarm. However, their sensitivity may not be sufficient to detect very small leaks if the gas concentration in the room is already high.
- 🧼 Prepare a strong soap solution or use dishwashing detergent.
- 🖌️ Apply foam with a brush to all accessible pipe connections and seams.
- 👀 Carefully monitor the surface for 2-3 minutes.
- 💨 If bubbles are detected, immediately stop using the device.
☑️ Checking the tightness
When a call to a technician is necessary and repairs
If a visual inspection and simple tests confirm your suspicions, or if the symptoms indicate an internal leak, further DIY repairs become impossible and dangerous. To restore functionality, special equipment is required: a vacuum pump, a pressure gauge station and a cylinder with freon.
The repair process includes finding the leak (often using pressurized nitrogen), soldering the damaged area, replacing the filter-drier and evacuating the system before refilling. Without removing moisture and air from the circuit, the new freon will not work correctly, and the compressor will quickly fail.
The cost of repairs consists of the difficulty of accessing the damage site and the price of materials. In some cases, such as a leak in a steam evaporator, repair may not be economically feasible and it may be easier to consider purchasing a new unit.
⚠️ Warning: Freon is a chemical that can form toxic compounds (phosgene) when in contact with an open flame. Do not carry out welding work near a working refrigerator or in an unventilated area.
Prevention and extension of the life of the refrigerator
To avoid problems with leakage refrigerant, it is important to operate the equipment correctly. The main rule is to never use sharp objects to speed up defrosting. Accidental puncture of the evaporator wall is the most common cause of instant loss of freon and costly repairs.
Regularly wipe the rear grille from dust and dirt. A clogged condenser leads to increased pressure in the system, which increases the load on the solder joints and can cause depressurization in weak areas. Also monitor the condition of the door seals to minimize compressor operation.
When moving or transporting the refrigerator, follow the transportation rules: do not drop or bend the tubes and let the unit settle before turning it on. The oil must drain into the compressor crankcase, otherwise water hammer is possible, which will damage the valves and seals.
Frequently asked questions (FAQ)
Can freon run out on its own without a hole?
No, freon is not a consumable item like fuel in a car. It circulates in a sealed circuit for decades. If there is less gas, it means that a microcrack or hole has formed through which it has escaped.
Is it dangerous to breathe freon vapors?
Most modern refrigerants (R600a, R134a) are not toxic in low concentrations, but they displace oxygen. Inhalation of large volumes may cause suffocation. In addition, isobutane (R600a) is explosive at high concentrations in the air.
How much does it cost to refill a refrigerator with freon?
The price depends on the type of gas, volume and complexity of the work. Usually the technician charges for the visit, diagnostics, soldering (if necessary) and the refueling itself. Simply “refilling” without looking for a leak is a temporary and often useless solution.
Why does the refrigerator not freeze after refueling?
There may be several reasons: incorrect amount of gas (underfilling or overfilling), the presence of air or moisture in the system (poor evacuation), or a malfunction of other components, such as a thermostat or compressor, which were not diagnosed.