The internal structure of a refrigerator remains a mystery to many until it begins to act up. Some of the most noticeable design elements are those that wrap around the back wall, run along the body, or are even visible inside the camera. But why are they needed, how to distinguish one from the other and what to do if the tube is hot, cold or covered with condensation? In this article we will understand all the nuances - from theory to practice. pipes, which weave around the back wall, run along the body or are even visible inside the camera. But why are they needed, how to distinguish one from the other and what to do if the tube is hot, cold or covered with condensation? In this article we will understand all the nuances - from theory to practice.
If you have ever looked behind the refrigerator, you have probably seen black or copper tubes, sometimes wrapped in thermal insulation. These are not just design details: they are responsible for circulating refrigerant, removing heat and maintaining temperature. Improper operation of the tubes can lead to compressor overheating, insufficient cooling or even failure. Therefore, the ability to “read” them is a useful skill for any owner.
We will not delve into complex physical processes (although we will briefly explain the principles of operation), but will focus on practice: how to independently inspect the tubes, what symptoms indicate malfunctions and when to call a technician. All tips are supported by the experience of service engineers and adapted for popular models Atlant, Samsung, LG, Indesit and Beko.
What tubes are in the refrigerator and what they are responsible for
Modern refrigerators use closed refrigerant circuit (usually freon), which passes through several key tubes They can be divided into three main categories:
- 🔹 Suction tube - thick, usually covered with black insulation. It removes freon gas from the evaporator back to the compressor. To the touch the suction tube should be cool or room temperature cool or room temperature.
- 🔹 Discharge (hot) tube - thin, often copper-colored, without insulation. Freon flows through it under high pressure into the condenser. When the compressor is running, it should be hot (50–70°C) - this is the norm!
- 🔹 Capillary tube - the thinnest, often intertwined with the suction tube. Regulates the flow of refrigerant before the evaporator. The should be cold at the inlet to the evaporator.
In addition, systems No Frost may contain additional tubes for defrosting the evaporator, and in two-compressor models - separate circuits for refrigeration and freezer compartments. It is important not to confuse them with drain tube (plastic, leads to a container for condensation) - it does not relate to the cooling system.
If your refrigerator is equipped with linear compressor (for example, in models Samsung RB or LG GB), tubes may have a non-standard configuration. In this case, it is better to check the diagram in the instructions.
⚠️ Attention: In refrigerators with inverter compressor (for example, Hitachi or Panasonic) the discharge tube may be less hot than in classic models. This is normal - such a compressor operates in a gentle mode.
How to distinguish tubes by appearance and temperature
The easiest way to identify tubes is visual inspection and tactile check. Here are the key features:
| Tube type | Appearance | Operating temperature | Location |
|---|---|---|---|
| Suction | Thick (6–10 mm), black insulation | Cool or room | From evaporator to compressor |
| Discharge | Thin (3–6 mm), copper, without insulation | Hot (50–70°C) | From compressor to condenser |
| Capillary | Very thin (1–2 mm), often woven with suction | Cold outlet | Before the evaporator |
| Drainage | Plastic, flexible | Room | Leads to the condensate container |
To check the temperature, gently touch the tubes when the compressor is running (it emits a slight hum). The discharge tube should be hot - this is a sign that the freon is compressing and giving off heat. If it is cold, this may indicate lack of refrigerant or clogging of the capillary tube.
The suction tube, on the contrary, should be cool or slightly warm. If it freezes or becomes covered with frost, this is a signal about excess of freon or malfunction of the thermostat. In models with No Frost (for example, Bosch KAN9***), freezing may also indicate a breakdown of the defrosting system.
Signs of tube failures: when to sound the alarm
Refrigerator tubes rarely fail on their own, but their condition may indicate problems in the system. Here are the key “symptoms” that should not be ignored:
- 🔥 The discharge tube does not heat up - there may be a freon leak, a compressor failure, or a blockage in the system. In models Indesit and Ariston this is often due to a malfunction of the start relay.
- ❄️ The suction tube freezes - a sign of an excess of freon, a malfunction of the thermostat or blockage in the capillary tube. In refrigerators Atlant this may indicate improper operation of the solenoid valve (in two-chamber models).
- 💧 Condensation on the tubes - if moisture appears only in hot weather weather, that's normal. But if condensation drains to the floor or the tubes “sweat” constantly, check door seals and drainage system.
- 🔊 Extraneous sounds - gurgling or hissing in the tubes may indicate freon leakage or air ingress the system. In models with linear compressor (for example, LG Door-in-Door) this is sometimes the norm when the operating mode changes.
Particular attention should be paid to places for soldering tubes. If traces of oil or rust are visible there, this may indicate microcracks. In refrigerators older than 10 years (for example Snaige or Nord) this is a common problem due to copper corrosion.
⚠️ Attention: If the tubes are coated green coating (copper oxidation), do not attempt to clean them with abrasives - this may worsen the corrosion. Use a soft cloth and specialized copper cleaners.
Temperature of the discharge and suction tubes|Insulation condition (cracks, breaks)|Presence of condensation or frost|Soldering points for leaks|Compressor operation (humming, clicking)-->
How to check the refrigerator tubes yourself: step-by-step instructions
If you notice one of the listed symptoms, perform diagnostics using the following algorithm. Before starting, unplug the refrigerator and let it stand for 10-15 minutes - this is necessary to relieve pressure in the system.
-
Inspect the rear walls
Move the refrigerator away from the wall and visually check the tubes for:
- 🔍 Cracks, dents or signs of corrosion.
- 💦 Oil leaks (a sign of freon leakage).
- 🧊 Frost or ice on the suction tube.
-
Checking the temperature
Turn on the refrigerator and after 20-30 minutes (when the compressor reaches operating temperature), carefully touch the tubes:
- 🔥 The discharge tube should be hot.
- ❄️ Suction - cool or room temperature.
- ⚠️ Capillary at the exit from the condenser - warm, at the entrance to the evaporator - cold.
-
Listening to the system
Put your ear to the back wall (or use a stethoscope). Normal sounds:
- ☑️ Smooth hum of the compressor.
- ☑️ Light gurgling of freon in the tubes.
Abnormal:
- ❌ Strong hissing (leakage).
- ❌ Clicking or knocking (compressor failure).
If you find deviations, try clean the capacitor (grid on the back wall) to remove dust - sometimes this solves the overheating problem. In models Samsung RL i LG GC- the capacitor can be hidden under the panel - to access you will need to remove the back cover.
What to do if the tube freezes in only one place?
This can point to local blockage in the capillary system or malfunction of thermal insulation. In refrigerators with crying evaporator (for example, Indesit BIAA 13), freezing is often associated with improper defrosting operation. Try defrosting your refrigerator for 12 to 24 hours. If the problem recurs, a specialist diagnosis is required.
Frequent problems with tubes and their solutions
Let's look at typical problems associated with tubes and how to fix them. Remember: some problems can be solved on your own, but repair Freon circuit always requires a specialist.
| Problem | Possible cause | Solution |
|---|---|---|
| Discharge tube does not heat up | Freon leak, compressor breakdown, blockage | Master diagnostics, freon refill |
| Suction tube freezes | Excess freon, thermostat malfunction | Adjusting the charge or replacing the thermostat |
| Condensation on the tubes | High humidity, faulty seals | Checking doors, replacing rubber bands |
| Strong gurgling in the tubes | Air or moisture getting into the system | Evacuating and refilling freon |
In refrigerators with a system No Frost (for example, Bosch KGE39 or Samsung RB29) freezing of pipes may be associated with malfunction of the defrost heating element or timer. In this case, replacement of the part is required - independent repair is not recommended.
If the tubes covered with rustthis often happens in older models (for example ZIL or Minsk). Corrosion can lead to freon leakage. As a temporary measure, you can treat the tubes anti-corrosion composition, but the full solution is to replace the damaged area.
⚠️ Attention: In refrigerators with absorption cooling system (for example, some models Electrolux) the tubes work on a different principle - they are uniformly warm. Do not confuse them with compressor systems!
When to call a technician: signs of serious damage
Some problems with tubes can be eliminated yourself (for example, clean the condenser or replace the seals). However, there are symptoms that require professional repair professional repair needed:
- 🛠️ Freon leakage if the tubes are covered with oil and the refrigerator does not cool, soldering of the leak points is also required. In models refrigerant charging and soldering leak points. In models Liebherr i Gorenje specialized equipment is often used for this.
- 🔧 Clogged capillary tube - if the suction tube freezes and the discharge remains cold, you need cleaning or replacing the capillary.
- ⚡ Failure of the compressor - if the tubes do not heat up and the compressor does not start (no hum), the winding may have burned out. In this case, the compressor needs to be replaced.
- 🔥 Overheating of the tubes —if the discharge tube heats up to 80°C or higher, this may indicate malfunction of the condenser fan (in models with forced cooling, for example, Samsung RS***).
The cost of repair depends on the complexity of the breakdown. For example, refilling freon in Moscow it costs 3,000–6,000 rubles, and replacing the compressor —from 8,000 rubles. In regions, prices may differ by 20–30%.
Prevention: how to extend the life of refrigerator tubes
To make the tubes last longer, follow simple recommendations:
- 🧹 Clean the condenser regularly from dust (once every 6 months). data-i="265">Regularly clean the condenser
- 🌡️ Do not place the refrigerator next to heat sources (battery, stove, direct sunlight). This increases the load on the compressor and tubes.
- 🚪 Check the door seals - if they are worn out, warm air penetrates inside, causing the system to work poorly. wear.
- ❄️ Defrost the refrigerator when ice appears on the tubes (even in models No Frost). data-i="274">sharply - this can cause water hammer in the system (especially important for
Defrost, if there is one. - 🔌 Do not pull the plug from the socket sharply - this can cause water hammer in the system (especially important for inverter compressors).
In refrigerators with dry freezing system (for example, Beko RCNE***) tubes are less susceptible to corrosion, but still require attention. If you live in a region with high humidity, treat metal parts once a year anti-corrosion spray (for example, WD-40 Specialist).
For models with external condenser (for example, Atlant MXM-170) it is important to ensure good ventilation of the rear wall - leave a gap of at least 5 cm from the wall.
FAQ: answers to frequently asked questions about refrigerator tubes
Why is the discharge tube hot but the refrigerator does not freeze?
This is a typical symptom leaks. freon or clogging in the capillary system. The compressor works, but the freon does not circulate properly. In models Indesit And Ariston this is often due to corrosion of tubes diagnosis of the master is required.
Is it possible to paint refrigerator tubes if they are rusty?
You can paint, but only special heat-resistant paint (for example Kudo KU-600 or Bosny Heat Resistant) Ordinary paint will crack due to temperature changes. However, this is a temporary solution - it is better to replace rusty tubes.
Why tubes gurgling like a boiling kettle?
A slight gurgling sound is normal, especially when starting the compressor. But if the sound is strong and constant, this may indicate:
- Hit moisture into the system (needs vacuumization).
- Problems with freon circulation (clogging or leakage).
B refrigerators Samsung s Digital Inverter gurgling may be louder due to the way the compressor operates.
What to do if the tubes are covered with a green coating?
Green coating is oxidation of copper (patina). It is not harmful to the operation of the refrigerator, but may accelerate corrosion. For cleaning:
- Turn off the refrigerator.
- Wipe the tubes with a solution of vinegar (1:1 with water).
- Apply protective layer (for example, Autosol Metal Polish).
In advanced cases (for example, in refrigerators older than 15 years), tubes may need to be replaced.
Is it possible to bend the refrigerator tubes when rearranging?
No The tubes are made of soft copper, and their deformation can lead to:
- 🔹 Clogging (when the capillary tube is bent).
- 🔹 Cracks and freon leakage.
If you need to move the refrigerator, carefully lift it by the bottom or use transport rollers.