The situation when the refrigerator stops freezing, but the compressor continues to hum, often confuses the owner. In most cases, the reason lies not in a motor breakdown, but in a banal blockage of the capillary tube or condensate drainage system Impaired refrigerant circulation or water leads to the fact that the equipment ceases to perform its main function, and the products begin to deteriorate. Understanding how to blow out the pipes in the refrigerator can save the situation and save you from calling a technician.
A blockage can occur in different components: in the drainage system, where ice and dirt accumulate, or in a thin capillary of the freon circuit, where oxidation products or moisture. Modern models with the No Frost system are especially sensitive to the cleanliness of the evaporator and air supply channels. If you notice a puddle under the unit or a lack of cold while the compressor is running, it’s probably time for preventive cleaning.
Before taking active steps, you need to assess the scale of the problem. Sometimes simple prevention is enough, and in some cases serious intervention using special tools is required. It is important to act carefully so as not to damage the thin-walled elements of the cooling system.
⚠️ Attention: Before starting any work on refrigeration equipment, be sure to disconnect the device from the electrical network. Working with live internal components is deadly.
In this article we will examine in detail the methods for cleaning various types of tubes, the necessary tools and precautions. You will learn how to distinguish a simple blockage from a complex breakdown and what you can do on your own.
Diagnostics of a blockage: where to look for the problem
The first step should always be an accurate diagnosis. Localization of the blockage determines the method of eliminating it. If water sits in the pan or leaks onto the floor, the problem is most likely in the drain pipe. If the refrigerator hums, but does not cool, and the condenser (grid at the back) remains cold or warm only at the entrance, this indicates a blockage of the refrigerant capillary tube.
To check the drainage, just pour a little water into the groove inside the chamber. If it doesn't go away, it means the channel is clogged with ice, crumbs or mucus. In the case of a freon circuit, the situation is more complicated: it requires listening to the operation of the compressor and analyzing the temperature of various parts of the system. Capillary tube has a very small diameter, so even a microscopic speck can stop the circulation of gas.
- 🔍 Check for ice on the back wall of the chamber or evaporator - this is a sign of poor circulation.
- 👂 Listen to the sounds: gurgling may indicate the presence of air or partial blockage.
- 🌡️ Feel the condenser: if it is completely cold, freon does not circulate.
It is also worth paying attention to the operation of the No Frost system. If the fan is humming, but no air is moving through the ducts, the air tube may be frozen. In this case, blowing out the system means clearing the way for air masses.
Necessary tools and preparation
For high-quality cleaning you will need a minimum set of tools, which most home craftsmen will have. The main thing is to prepare everything in advance so as not to be distracted during the work. A compressor for purging is a key element when it comes to freon lines, but simpler means are often sufficient for drainage.
You will need a large-volume syringe (20 or more cubic meters), a rubber bulb or special wire for cleaning. If you plan to work with refrigerant, you need a nitrogen cylinder with a reducer or a powerful compressor. Don't forget to prepare a container for collecting water and dirt, as well as a rag for wiping.
☑️ Preparing for cleaning
It is important to ensure good lighting of the work area. Often clogs are located in hard-to-reach places, and without a flashlight you can miss an important area. It is also recommended to have a hairdryer on hand if you need to defrost the ice plug before mechanical cleaning.
Cleaning the refrigerator drainage system
The most common problem that owners face is a clogged drain hole. It is designed to drain melt water into the evaporator, but over time mold, grease and food debris accumulate there. Blowing out this system is not difficult if you act consistently.
First, find the hole on the back wall of the refrigerator compartment. It is usually located in the center, at the bottom. Take a syringe with warm water (you can add a little soda for disinfection) and try to rinse the channel under pressure. If the water drains slowly, use a soft wire or a special brush to mechanically destroy the plug.
⚠️ Attention: Do not use sharp metal objects (knitting needles, nails) to clean the drainage, as you can pierce the thin plastic tube or damage the internal circuit.
After mechanical cleaning, be sure to blow out the channel with air. To do this, you can use a rubber bulb: press it tightly to the hole and press sharply, creating an air plug. This will help push the remaining dirt into the compressor pan, where it will safely evaporate.
- 💧 Rinse the channel 3-4 times with warm water to completely remove plaque.
- 🧹 Use a cotton swab to clean the inlet from visible mucus.
- 🌬️ Make sure the water drains quickly and without gurgling.
If the drain tube is long and curved, simply blowing it out may not help. In such cases, craftsmen use a flexible cable, but at home it is better to limit yourself to washing and using water pressure.
Methods for blowing a capillary tube
The situation with the capillary tube of the freon circuit is much more serious. Refrigerant circulates here under pressure, and any moisture or copper oxides can cause oil-paraffin blockage. It is impossible to blow out such a system simply with your mouth or a syringe - a pressure of several atmospheres is required.
To perform this operation, access to the process pipe of the compressor is required. After disconnecting the capillary from the filter drier, nitrogen or dry air is supplied to it under pressure. The process requires caution: a sharp jump in pressure can rupture the tube, and moisture entering the system will completely damage the refrigerator.
Why can’t you blow into the capillary with your mouth?
Human breath contains a lot of moisture. The entry of even a microscopic amount of water into the cooling system will lead to the formation of an ice plug in the capillary during operation, which will completely block the circulation of freon and cause corrosion from the inside.
Often the blockage is localized at the point where the capillary enters the filter drier. In this case, careful reverse purging sometimes helps, but this requires professional vacuuming and charging equipment. Blowing out a capillary on your own without skills and tools is extremely difficult and risky.
| Type of blockage | Symptoms | Elimination method | Difficulty |
|---|---|---|---|
| Ice plug | The refrigerator freezes, then stops | Full defrosting (24 hours) | Low |
| Garbage in the drainage | Water inside the chamber | Rinsing with a syringe/bulb | Low |
| Paraffin blockage | The compressor is running, there is no cold | Blowing with nitrogen, replacing the filter | High |
| Clogged in the evaporator | Poor cooling, ice | Disassembly, cleaning, air purging | Medium |
If you are not confident in your abilities, it is better not to get into the freon circuit. Improper purging can lead to depressurization, which will require expensive soldering and refilling.
Cleaning the No Frost system and air ducts
In refrigerators with the system No Frost cold air is forced to circulate through channels located behind the plastic panels. Over time, these channels can become clogged with ice or foreign objects (for example, pieces of packaging that have been pulled in by a fan). To vent here means to clear a path for air flow.
To access the air ducts, you must remove the back panel in the freezer. Below it you will see an evaporator and a fan. If ice or dirt is visible on the fan blades or in the duct openings, they must be carefully removed. Use a hair dryer to defrost the ice, but do not direct the hot jet directly at the plastic to avoid deformation.
After cleaning, assemble the structure and check the passage of the channels. You can use a piece of paper or smoke (for example, from a smoldering cotton swab, be careful!) to check whether air is being sucked into the holes. Air circulation It should be free and uniform.
Often the cause of poor performance is the fan itself. If its blades are contaminated with grease, it rotates more slowly and moves air less well. Wipe the blades with an alcohol wipe or damp cloth.
Using a compressor for professional blowing
If simple methods do not help, craftsmen use a compressor. This device creates a powerful air stream that can dislodge even blockages. However, the connection requires adherence to technology: it is necessary to use a moisture separator so that moisture from the compressed air does not enter the system.
The process looks like this: a hose from the compressor is connected to the process connection. The pressure is gradually increased, monitoring the integrity of the connections. Sharp pops may indicate a break in the blockage.
For home use, you can assemble a simple installation from a car compressor for inflating tires, but the pressure there is usually not enough for complex cases. Professionals use nitrogen because it is inert and does not contain moisture.
⚠️ Attention: The pressure in the system during purging should not exceed the permissible standards for this type of compressor (usually up to 10-15 atmospheres), otherwise the heat exchangers can be damaged.
Prevention and care of the system cooling
To avoid having to frequently blow out the tubes in the refrigerator, you should follow simple operating rules. Regular defrosting (for drip systems) and cleaning the drainage will prevent the formation of ice plugs. Do not place hot foods in the chamber and ensure the integrity of the food packaging.
Once every six months, it is recommended to carry out a preventive inspection of the seals and drainage hole. A simple rinse with baking soda will kill bacteria and prevent mucus from forming. Also monitor the humidity level in the room where the refrigerator is located.
If you notice the first signs of deterioration in performance - extraneous sounds, slow freezing of water - do not wait for a complete stop. Early diagnosis allows you to solve the problem with minimal means. Remember that care of equipment extends its service life.
Is it possible to clear the capillary with a syringe?
No, the syringe will not create enough pressure to break through the blockage in the capillary tube. The diameter of the capillary is a fraction of a millimeter, and the plug is held there very tightly. The syringe is only suitable for the drainage system.
What is the danger of moisture getting into the freon circuit?
Moisture in the system freezes in the capillary, forming an ice plug that blocks the circulation of the refrigerant. In addition, water reacts with oil and freon, forming acids that corrode the metal from the inside, leading to through corrosion.
How often should you clean the drain?
It is recommended to carry out preventive cleaning of the drain hole every 6 months. If you have pets or you cook a lot of food that produces steam, the frequency can be increased to once a quarter.
Why doesn’t the refrigerator turn on after defrosting?
Perhaps the thermal protection relay for the compressor has triggered, which did not have time to cool down. Wait 30-40 minutes. If the problem persists, the start relay could burn out or a water hammer may form in the compressor due to trapped liquid.