Have you ever looked behind the refrigerator and noticed a strange pipe there? It can be black, metal or plastic, sometimes curved and sometimes straight. Many users get scared, thinking that this is a sign of a breakdown or leak. In fact, the tube on the back wall of the refrigerator is an important element of the system, without which the device simply cannot function normally.
In this article we will look in detail at what kind of tube is this?how it is arranged in different models of refrigerators (Atlant, Indesit, Samsung, LG etc.), why it can freeze or heat up, and what to do if something is wrong with it. You will also find out whether you can clean or repair it yourself, and when you should call a specialist.
If you recently bought a refrigerator or encountered unusual behavior of this part - for example, it became hot, covered with frost or started drip - here you will find answers to all questions. And for those who like to understand technology, we have added diagrams and explanations about the principle of operation.
What What kind of tube is this and why is it needed?
The tube on the back wall of the refrigerator is part condenser-drainage system. Depending on the model, it can perform one or more functions:
- 🔹 Draining condensate — removal of melt water from the chamber (in models with a system No Frost or drip defrosting).
- 🔹 Refrigerant circulation — in some refrigerators, the tube is part of the cooling circuit (for example, in old models ZIL or Minsk).
- 🔹 Compressor ventilation — heat removal from motor (more often found in modern inverter refrigerators).
- 🔹 Drain hose - removal of moisture from the defrosting system into the evaporation tray.
In most modern refrigerators (Samsung RB30J3000WW, LG GA-B489YVQZ, Atlant XM 4021-000) this tube is connected to drainage system. When the refrigerator defrosts (automatically or manually), melt water flows down the back wall into a special tray, and then through the tube is discharged into an evaporation tank located next to the compressor.
If the tube hot is normal: it can heat up from the operation of the compressor or condenser. If it cold and covered with frost is a sign of a malfunction (more on this in the section on problems).
How the tube is designed in different types refrigerators?
The design of the tube depends on type of defrosting system and the model of the refrigerator. Let's consider the main options:
| Type of refrigerator | Purpose of the tube | Material | Temperature during operation |
|---|---|---|---|
| Drip system (Atlant, Indesit) | Draining condensate into the pan | Plastic or rubber hose | Room (can be slightly warm) |
| No Frost (Samsung, LG, Bosch) | Drainage of melt water + ventilation | Plastic with metal reinforcement | Can heat up to 40–50°C |
| Old Soviet models (ZIL, Minsk) | Part of the refrigerant circuit | Copper or aluminum | Cold or room temperature |
| Inverter (Hitachi, Panasonic) | Heat removal from the compressor + drainage | Heat-resistant plastic | Hot (up to 60°C) |
In refrigerators with No Frost the tube is often connected to evaporatorlocated behind the back wall. In drip models, it leads directly to drain pan, which is usually hidden under the compressor. In old refrigerators (for example, ZIL-63) the tube. could be part freon circuit —it could not be touched without special skills.
How to check if the tube is part of the No Frost system?
In refrigerators with No Frost, the tube is usually thicker and stiffer than in drip ones. It can be wrapped in thermal insulation or have metal fasteners. If the tube heats up when the refrigerator is operating, this is a sign of a connection with the condenser.
Why the tube can. heat up?
Many users are scared when they notice that the tube on the back wall of the refrigerator has become hot. In fact, this is a normal phenomenon for most modern models. Here are the main reasons for heating:
- 🔥 Compressor operation - the tube may be part of the motor cooling system (especially in inverter refrigerators Samsung or LG).
- 🔥 Condenser nearby - if the tube passes next to the radiator (grid on the back wall), it will heat up from it.
- 🔥 No Frost System —in such refrigerators, the tube can be connected to a heating element, which is periodically turned on to defrost.
- 🔥 Additional radiator —in some models (Bosch KGN39XL30) the tube is used to remove heat from the electronics.
⚠️ Attention: If the tube is not just warm, but hot (more than 70°C) or has a burning smell, this is a sign of a malfunction! Immediately unplug the refrigerator and call a technician. Possible causes: a short circuit in the heating element or a breakdown of the compressor.
To understand whether the heating is normal, touch the tube with your hand. If the temperature is tolerable (like a hot cup of tea), everything is fine. If it burns, this is a cause for concern.
Freezing of the tube: reasons and what to do
If the tube is covered with frost or ice, this a sign of malfunctionIn normal condition, it should be dry or slightly damp (at the time of defrosting). reasons for freezing:
- Clogged drainage hole —water does not go into the pan and freezes on the tube. Often found in refrigerators Atlant and Indesit.
- Failure of the evaporator heater —in systems No Frost the tube may freeze if the defrosting heating element is broken.
- Refrigerant leak —if the tube is part of the freon circuit (in old models), its freezing indicates a loss of tightness.
- Incorrect installation - if the refrigerator is too close to the wall, air circulation is disrupted and moisture condenses on the tube.
⚠️ Attention: If the tube freezes in the refrigerator, do not try to break off the ice with a knife or other sharp objects! This may damage the system. It is better to defrost the refrigerator for 12–24 hours, and then check the drainage. No Frost, do not try to break off the ice with a knife or other sharp objects! This may damage the system. It is better to defrost the refrigerator for 12-24 hours, and then check the drainage.
To fix the problem:
Turn off the refrigerator and defrost it completely|Check the drainage hole for blockages (clean with a cotton swab or soft wire)|Make sure that the refrigerator stands with a gap from the wall (at least 5 cm)|If the problem repeats, call a technician to diagnose the No Frost system-->
Water is flowing from the tube: how to fix it?
If water drips or flows from the tube on the back wall of the refrigerator, this indicates problems with the drainage system. In normal mode, moisture should evaporate from the pan without leaking out. The main reasons:
- 💧 The pan is overfilled —if the refrigerator has not been defrosted for a long time, water may overflow.
- 💧 The tube is clogged —dirt has accumulated inside and the water does not go into the pan.
- 💧 Improper tilt —the refrigerator is not level, and water flows past the tray.
- 💧 Crack in tube —if it is plastic, it may burst over time due to temperature changes.
To fix a leak:
- Unplug the refrigerator and pull it away from the wall.
- Find the condensate pan (usually under the compressor) and drain the water from it.
- Clean the tube with a soft wire or rinse it warm water and soap.
- Check whether the refrigerator is level (use a level).
- If the tube is damaged, replace it (universal hoses are sold in spare parts stores).
⚠️ Attention: If after cleaning the tube continues to flow, the problem may be in broken evaporator heater (for No Frost) or in faulty thermostat. In this case, you cannot do without a technician.
How to clean the tube without the risk of damaging it?
Use only soft materials: cotton swabs, silicone brushes or thin plastic wire. Do not use metal objects as they may pierce the hose. After cleaning, rinse the tube with a soda solution (1 tablespoon per glass of water) to remove mold.
Is it possible to clean or repair the tube yourself?
Many problems with the tube on the back wall of the refrigerator can be eliminated without calling a specialist. However, there are nuances that are important to consider:
What you can do yourself:
- ✅ Clean the drainage hole and tube from blockages.
- ✅ Rinse the condensate pan.
- ✅ Replace the damaged hose with a new one (if it is removable).
- ✅ Adjust the position of the refrigerator (tilt, gap from the wall).
When you need a master:
- ❌ The tube is part freon circuit (in older models).
- ❌ Freezing is associated with refrigerant leak.
- ❌ Faulty evaporator heater or thermostat.
- ❌ The tube is hot or sparks.
If you decide to clean the tube yourself, follow the instructions:
- Unplug the refrigerator.
- Take out all the food and defrost the chambers.
- Move the refrigerator away from the wall and find the tube.
- If it is removable, remove it and rinse under running water water.
- If it is not removable, clean it with a brush or wire, then rinse with a solution of vinegar (1:1 with water) for disinfection.
- Check the tray for cracks or dirt.
⚠️ Attention: Never use for cleaning tubes boiling water or aggressive chemicals (for example, Domestos or Whiteness)! They can damage plastic or rubber, which will lead to leakage.
Common mistakes when handling the handset
Many users accidentally aggravate problems with the handset due to ignorance of its structure. Here the most common mistakes and their consequences:
| Error | Consequences | How to avoid |
|---|---|---|
| Bending or twisting of the tube | Impaired condensate drainage, water leakage | Do not change the position of the tube unless necessary |
| Cleaning with metal objects | Punctures, cracks, refrigerant leaks (in older models) | Use only soft brushes |
| Ignoring freezing | Compressor breakdown, failure No Frost | Regularly defrost the refrigerator |
| Installing the refrigerator close to wall | Overheating of the compressor, condensation on the tube | Keep a gap of at least 5 cm |
Another common mistake is trying to insulate the tube using fabric or foam rubber. This may lead to compressor overheating or condensation build-up. If the tube is too hot, it is better to check the operation of the ventilation than to close it.
Also, some users confuse the drainage tube with capillary tube (part of the freon circuit). The latter absolutely cannot be touched without special equipment!
FAQ: Answers to frequently asked questions
Why did the tube on the back wall of the refrigerator Atlant become hot?
B refrigerators Atlant with a drip system, the tube usually does not get very hot. If it becomes hot, check:
- Is the refrigerator standing too close to the wall (there should be a gap of 5-10 cm).
- Is the condenser clogged with dust (clean the grill on the back wall).
- Is the compressor not working properly? intensified mode (for example, due to the heat in the room).
If the tube burns, turn off the refrigerator and call a technician.
Is it possible to cut off part of the tube if it is too long?
No! The tube has a strictly calculated length for proper drainage of condensate. If it is shortened:
- Water may not have time to evaporate from the pan.
- The air circulation around the compressor will be disrupted.
- In systems No Frost this can lead to freezing of the evaporator.
If the tube is in the way, gently bend it (without pinching it!).
What to do if water flows from the tube in the refrigerator Samsung No Frost ?
In models Samsung s No Frost leakage from the tube is usually associated with:
- Clogged drain channel (clean it with a cotton swab).
- Faulty defrost heater (needs a technician).
- Crack in the pan (replace it).
Unplug the refrigerator, defrost it for 12 hours, then check if the leak recurs.
Why does the tube become rusty?
Rust appears on the tube if:
- It is metal (in older models ZIL, Minsk).
- The refrigerator is in a damp room (for example, at the dacha).
- The tube is in contact with aggressive detergents.
To remove rust, use a vinegar solution (1:1 with water) and a soft brush. If the rust is through, replace the tube.
Is it necessary to insulate the tube if it gets hot?
No, it is not only not necessary to insulate the tube, but it is also dangerous! It heats up for one reason:
- It removes heat from the compressor. (as it should be).
- It is part of the system No Frost.
- It runs next to the condenser.
Insulation can cause the refrigerator to overheat. If the heating seems excessive, check the ventilation and cleanliness of the condenser.