Ice freezes on the tube in the refrigerator: why this happens and how to fix it

Have you opened the refrigerator and discovered that a thick layer of ice has grown on the back wall or the evaporator tube? This is not just an aesthetic problem - the ice “coat” impairs the performance of equipment, increases energy consumption and can lead to serious damage. In 80% of cases, the reason lies in a violation of air circulation or a malfunction in the defrosting system, but sometimes external factors that you don’t even suspect are to blame.

In this article we will look at all possible causes of tube icing from a banal clogged drainage hole to a breakdown of the electronic control unit. You will learn how to diagnose the problem yourself, when you can get by with simple defrosting, and in what cases you cannot do without calling a specialist. We will pay special attention to models with the system No Frost —they have their own “weak points”, which are rarely written about in the instructions.

Spoiler: if ice appears only in the freezer compartment, and the main compartment is dry, this is one scenario. If ice forms on the tube capacitor (the one at the back of the refrigerator), it’s completely different. And the solutions will be different.

1. A clogged drain hole is the most common cause

In 6 out of 10 cases, ice appears on the evaporator tube because drainage hole (the small hole at the bottom of the back wall) is clogged with crumbs, food particles or mold. Water that should drain into the pan stagnates, freezes and forms build-up. Over time, the ice plug completely blocks the channel - and the refrigerator begins to “cry” inside, and a thick layer of frost grows on the tube.

How to check? Carefully remove the back panel in the refrigerator compartment (usually secured with latches or screws) and shine a flashlight into the drain hole. If debris or ice is visible there, the problem has been found. In models Samsung RB30J3 and LG GA-B489 the drainage often becomes clogged due to the channel being too narrow, and in Indesit DF 4180 due to the poor placement of the shelves above the hole.

• 🧊 Signs of clogging: puddles under the vegetable drawers, ice only at the bottom of the back wall, unpleasant smell.
• ❄️ What will happen if you don’t clean it: the compressor will start working without stopping, power consumption will increase by 20-30%.
• 🔧 How to clean: use a flexible cable (for example, from a bicycle brake) or syringe with warm water.

⚠️ Attention: Never use sharp objects (needles, knives) to clean the drainage - you risk damaging the plastic channel. If the ice cannot be removed with warm water, defrost the refrigerator for 10–12 hours, and then repeat the procedure.

2. Malfunction of the defrosting system (for No Frost)

Refrigerators with the system No Frost (for example, Bosch KGE39XW2A, Atlant XM 4625-101) should defrost automatically. If ice builds up on the evaporator tube (the one hidden behind the back panel), it means that one of the key elements has broken:

• 🔥 Defrost heating element —the contacts have burned out or oxidized.
• ⏱️ Defrost timer — “stuck” and does not turn on the heating.
• 🌡️ Defrost sensor (defroster)—measures the temperature incorrectly.
• 🧲 Fuse —burnt out due to a power surge.

How to check? Unplug the refrigerator, remove the back panel of the freezer and inspect the heating element (thin tube with wires). If there is no carbon deposits on it, test it with a multimeter - the resistance should be 20–40 ohms. In models Samsung RL38 and Liebherr CN 4015 most often the defrost sensor fails, and in Whirlpool ART 9810 the timer.

⚠️ Attention: If you are not confident in your skills with a multimeter, do not take risks - a short circuit in the defrosting system can damage it electronic control unit. In models Samsung and LG with a display, when such a breakdown occurs, an error often appears 22E or FF.

3. Failure of the thermostat or electronic unit

If ice on the tube appears simultaneously with other “symptoms” - the refrigerator does not turn off, is very cold, or, conversely, does not cool well - the problem may lie in thermostat (in mechanical models) or electronic control unit (in modern refrigerators with a display).

How does it work? The thermostat sends incorrect temperature data and the compressor runs non-stop, freezing the evaporator. In electronic models (for example Samsung RB37J5 or Indesit EF 18), the firmware of the control unit may fail - this leads to chaotic activation of the defrosting heating element or fan.

• 📉 Signs of thermostat failure:
  • The compressor runs constantly, not turns off.
  • The temperature in the chamber is lower than the set one (for example, +2°C instead of +5°C).
  • There is ice on the back wall even with the minimum cooling mode.
• 🖥️ Signs of an electronic unit failure:
  • Refrigerator reboots spontaneously.
  • Errors flash on the display Er1, F2, E5.
  • Cooling modes turn on chaotically.

⚠️ Attention: In refrigerators Atlant i Stinol older than 2015, the mechanical one often fails thermostat K-59. You can replace it yourself, but it is important to choose an analogue with the same temperature characteristics (for example, Danfoss 077B6).

4. Freon leakage or clogged capillary tube

If ice on the tube is accompanied by poor cooling (food spoils, the freezer does not freeze), the reason may be leakage of refrigerant (freon) or clogged capillary system. This is one of the most serious breakdowns that requires professional repair.

How to recognize:

• ❄️ Ice forms only on one section of the tube (usually near the compressor).
• 🔊 The compressor is louder than usual, but the cooling is weak.
• 🌡️ The temperature in the chambers does not fall below +10–12°C.

In models Beko CN 325220 and Gorenje RK 4181 leakage often occurs at the soldering point of the evaporator tubes. In refrigerators Samsung and LG with a system No Frost clogging of the capillary tube can be caused by moisture getting into the system (for example, after incorrect refilling of freon).

⚠️ Attention: It is impossible to eliminate a freon leak on your own - special equipment is required (vacuum pump, gauge manifold) and certified refrigerant. Do not trust “garage” technicians who offer to fill the refrigerator with “cheap freon” - this can lead to compressor failure.

5. Incorrect operation of the refrigerator

Sometimes ice appears on the tube not due to a breakdown, but because violations of the rules of use. Here are the most common errors:

• 🚪 Frequent or prolonged opening of the door. Warm air enters the chamber, moisture condenses on the evaporator and freezes. This is especially true for models No Frostwhere a fan accelerates cold air.
• 🥬 Storing liquids in open container. Evaporation from soups, compotes or dairy products settles on the tube and turns into ice.
• 🌡️ Setting the temperature too low. If you put -24°C in the freezer or +1°C in the refrigerator, the evaporator will freeze even in a working refrigerator.
• 🔌 Connecting to the network via an extension cord. Voltage surges can disrupt the operation of the electronic unit, which leads to incorrect defrosting cycles.

⚠️ Attention: B In refrigerators Atlant and Birusa with mechanical controls, an ice “coat” often appears due to the fact that the temperature regulator is set to maximum (7 on the scale). The optimal position is 3–4 (this is approximately +4–5°C in the main chamber).

What will happen if you ignore ice?

If the cause of icing is not eliminated, the compressor will wear out, which will lead to its overheating and breakdown. On average, the compressor life is reduced by 30–40% when constantly operating in freezing mode. In addition, ice build-up can damage the plastic parts of the evaporator, which will require expensive repairs.

6. Problems with the door seal

Worn or dirty seal allows warm air inside the chamber. The humidity rises and condensation forms on the evaporator tube, which then freezes. This problem is especially relevant for refrigerators older than 5 years (for example, Indesit BIAA 13, Samsung RL-34 EBSW).

How to check the seal:

1. Close the door and shine a flashlight along the rubber - if the light passes through, the seal is broken.
2. Insert a sheet of paper between the door and the body - if it falls out easily, the seal does not fit.
3. Inspect the rubber for cracks, deformations or traces of mold.

⚠️ Attention: If the seal is dirty (for example, with sticky residue from food), you can try to restore it. Wash the rubber with a warm soda solution (2 tbsp. spoons per 1 liter of water), then lubricate with silicone grease. If the seal has lost its shape, it will have to be replaced - in service centers they cost from 1,200 to 3,000 rubles.

7. External factors: humidity, temperature, ventilation

Sometimes ice appears on the tube due to the conditions in which the refrigerator is located. Here is what can affect it:

• 🌧️ High humidity in the room (more than 70%) In this case, condensation forms even on the outer walls of the refrigerator.
• 🔥 Heat or direct sunlight. If the refrigerator is located next to the stove or window, the compressor works at the limit, which leads to freezing of the evaporator.
• 🪟 Poor ventilation. The gap between the wall and the back wall of the refrigerator must be at least 5 cm, otherwise heat exchange is disrupted.
• ⚡ Unstable voltage in the network. Frequent surges can disrupt the operation of the electronic unit, which leads to failures in the defrosting cycle.

⚠️ Attention: In refrigerators No Frost (for example, Bosch KAN92VI30R) ice build-ups on the tube can appear if the room temperature is below +16°C. In this case, the compressor operates in a non-optimal mode, and the defrosting system cannot cope.

FAQ: Frequently asked questions about ice on the refrigerator tube

Is it possible to simply break off the ice with a knife or fork?

No! Mechanical removal of ice can damage the evaporator tubes or plastic parts. The correct way is to defrost the refrigerator for 12-24 hours with the doors open. ice appears again, look for the reason (see sections above).

Why does ice accumulate only in the freezer compartment, but in the refrigerator it is dry?

This is typical for two-compressor models (for example, Liebherr CNef 4315), where the freezer and refrigerator operate independently. Reasons:

• Faulty Freezer defrosting heating element.
• Clogged freezer drainage.
• Temperature set too low (below -18°C).

The refrigerator is new, but ice has already appeared. What should I do?

Most likely it is assembly defect or transport damage. Do not try to repair it yourself - contact service center under warranty. Usually, such defects appear in the first 2-3 months of operation. Check with the seller whether the transportation conditions were violated (for example, the refrigerator was transported lying down).

After defrosting, ice appears again after 2-3 days. business?

This is a sign system malfunction - most likely the problem is:

• Faulty sensor defrosting (if the model is with No Frost).
• Leakage freon (if the cooling is weak).
• Clogged capillary tube (the compressor runs non-stop, but does not freeze).

A specialist's diagnosis is required.

Can ice on the tube be hazardous to health?

Ice itself is not harmful, but it can signal an o bacteria growthIf. ice is accompanied by an unpleasant odor, this is a sign of mold in the drainage system. In this case, you need not only to defrost the refrigerator, but also to wash all surfaces with a solution of vinegar (1:1 with water) or a special antibacterial agent.