The No Frost refrigerator freezes a lot: 7 reasons and how to fix it

Have you noticed that your refrigerator with the system No Frost has begun to work too intensely? The food in the main chamber freezes slightly, an ice crust forms on the back wall, and the motor almost never turns off? This is not just an inconvenience - this behavior of the equipment signals about Irregularities in the operation of the cooling system. Unlike drip refrigerators, where freezing is often associated with clogged drainage, in No Frost the problem usually lies deeper: from incorrect settings to breakdown of key components.

In this article we will examine all possible reasons why the No Frost refrigerator is very cold- from trivial (for example, a door that is not tightly closed) to serious (failure of a temperature sensor or electronic module). You will learn how to independently diagnose a malfunction, when you can get by with adjusting the thermostat, and in which cases you will need to call a technician. We will also provide a checklist for prevention so that the problem does not recur.

We will immediately warn you: if your refrigerator is under warranty, do not rush to disassemble it yourself. Certain actions (for example, tampering with the electronic unit) may void the manufacturer's warranty. In this case, it is better to contact a service center LG, Samsung, Indesit or another brand indicated in the device passport.

1. Incorrect temperature settings

The most obvious, but often ignored reason is incorrectly set cooling mode. In refrigerators No Frost the temperature is regulated separately for the freezer and refrigerator compartments. If the main chamber is set to a value below +4°C, the products will begin to freeze, especially on the upper shelves (closer to the evaporator).

Checking the current settings is simple:

• 🔍 Find the control panel (usually located on the top of the door or inside cameras).
• 📊 Look at the set temperature on the display or mechanical regulator. Optimal values:
  • Refrigerator compartment: +4°C...+6°C
  • Freezer: -18°C...-20°C
• ⚙️ If the temperature is too low, increase it by 1-2 degrees and watch the changes throughout the day.

Please note: in some models (for example, Samsung RB30J3000WW or LG GA-B489YGQZ) there is a mode Super Freeze or Power Coolthat forcibly reduces the temperature for quick freezing. If this mode is activated accidentally, it must be turned off manually - otherwise the refrigerator will freeze without stopping.

⚠️ Attention: In refrigerators with two-compressor system (for example, Liebherr CNef 4815) the settings of the freezer and refrigerator compartments are completely independent. Check both regulators!

2. Clogged ventilation system No Frost

The system No Frost works by circulating cold air, which is forced by a fan through the evaporator. If the air channels or the evaporator itself are clogged with dust, ice or frost, heat transfer is disrupted - the compressor starts working without interruption, trying to compensate for the lack of cooling. As a result, the temperature in the chamber drops below normal.

How to check and clean the system:

1. Unplug the refrigerator and defrost it for 10-12 hours (this will remove ice in hidden channels).
2. Remove the back panel in the refrigerator compartment (usually it is attached to latches or screws).
3. Inspect the evaporator (metal grille) and fan. If there is ice or dust:
   • 🧊 Carefully remove the ice with a plastic spatula (do not use metal objects!).
   • 🌬️ Remove dust with a vacuum cleaner or soft brush.

Check whether the fan blade rotates freely (if it is blocked ice, defrosting is required).

In models with auto defrost (for example, Bosch KGE39XW2AR) clogging of the channels often occurs due to a malfunction of the evaporator heater. If after manual defrosting the problem repeats after 1-2 weeks, diagnostics of the heating element is required.

Disconnect the refrigerator from the mains

Defrost for at least 10 hours

Remove the back panel in the refrigerator compartment

Clean the evaporator from ice and dust

Check the rotation of the fan

Assemble the panel back-->

3. Malfunction of the temperature sensor

The temperature sensor (thermistor) transmits data about the current climate in the chamber to the electronic module. If it fails or gives incorrect readings, the control unit “thinks” that the refrigerator is too warm and forces the compressor to work without stopping. Symptoms of sensor failure:

• 🌡️ The temperature on the display does not correspond to the real one (for example, it shows +5°C, and the food is frozen).
• ❄️ The compressor turns on for long cycles (more than 30–40 minutes without pauses).
• 🔄 After manual shutdown, the refrigerator freezes the food again.

You can check the sensor with a multimeter:

1. Turn off the refrigerator and find the sensor (usually it is located next to the evaporator or on the back wall of the chamber).
2. Remove the terminals and measure resistance:
   • At room temperature (~20°C) the resistance should be 5–7 kOhm.
   • If you lower the sensor into a glass of cold water, the resistance should increase to 20–30 kOhm.

If the readings do not change or are equal to 0/∞, the sensor is faulty and requires replacement.

⚠️ Attention: In refrigerators Atlant i Beko sensors often fail due to condensation falling on the contacts. Before replacing, make sure that the connectors are dry!

4. Failure of the electronic control module

The "brain" of the refrigerator - electronic control unit - is responsible for processing signals from sensors and controlling the operation of the compressor. If the module fails (for example, due to a power surge or moisture ingress), it may issue false continuous cooling commands. Signs of a malfunction of the unit:

• 🔄 The refrigerator spontaneously turns on/off modes (for example, Super Cool).
• 📛 Errors appear on the display (codes E1, F2, H1 etc.).
• 🔌 The compressor does not respond to changes in temperature settings.

Independent repair of the module is difficult and requires soldering skills. However, you can try resetting the settings to factory settings:

1. Unplug the refrigerator for 10-15 minutes.
2. Turn it back on and at the same time press and hold the buttons Super Freeze + Temperature Up (for Bosch) or Fridge + Freezer (for LG) for 5-10 seconds.
3. If the reset is successful, the indicator will flash on the display or a sound will sound signal.

If the reset does not help, the module will have to be reflashed or replaced. In service centers, this service costs from 2,500 to 5,000 rubles (depending on the model). - about 300 ₽). Samsung And LG sometimes replacing the capacitors on the board helps (the cost of the parts is about 300 ₽).

How to avoid damage to the electronic module?

To extend the life of the control unit, use voltage stabilizer (especially important for houses with frequent power fluctuations). Also avoid placing the refrigerator near sources of moisture (for example, under a tap or next to a shower stall).

5. Refrigerant leak or clogged capillary tube

If the refrigerator No Frost is very cold, but the compressor runs almost without pauses, and the temperature in the freezer is not low enough, there may be a blockage in the circulation system. The cause of the leak is often: freon leak or a blockage in the circulation system. Leaks are often caused by:

• 🛠️ Mechanical damage to the circuit (for example, when moving the refrigerator).
• 🔥 Corrosion of tubes (in old models or at high humidity).
• 🧊 Clogged filter drier (due to moisture or debris).

It is difficult to diagnose a leak on your own, but you can pay attention to indirect signs:

• 🔊 The compressor hums louder than usual, but the cooling is weak.
• ❄️ Little ice forms in the freezer (or it melts faster).
• 🌡️ The temperature in the refrigerator compartment is unstable (either too low or rising).

To fix the problem you will need:

1. Contact a specialist for evacuating the system and refilling with freon.
2. If clogged, clean the capillary tube or replace the filter-drier.
3. If mechanical If damaged, solder the circuit or replace the evaporator.

⚠️ Attention: Work with refrigerant requires special equipment and certification! Self-refilling with freon is hazardous to health and can lead to compressor failure.

6. Problems with door seals

Worn or dirty seals allow warm air into the chamber, causing the refrigerator to work harder. As a result, the temperature drops below normal and the compressor wears out faster. It’s easy to check the tightness:

• 📄 Take a sheet of paper and clamp it between the door and the body.
• 🔍 If the sheet is pulled out without effort, the seal does not fit tightly.
• 💡 Also inspect the rubber for cracks, deformations or marks mold.

Solutions:

• 🧼 Cleaning: Wipe the seal with warm soapy water, then lubricate with silicone grease (for example, WD-40 Specialist).
• 🔧 Adjustment: If the door is sagging, tighten the hinges or adjust the position using a hex key.
• 🛒 Replacement: If there is severe wear, buy a new seal (cost from 1,000 to 3,000 rubles depending on the model). To replace, remove the old rubber and carefully insert the new one into the groove, starting from the corners.

In refrigerators Stinol and Indesit seals often “tan” due to temperature changes. If the rubber has lost its elasticity, it is better to replace it - cleaning will only give a temporary effect.

7. Malfunction of the compressor or start relay

If the compressor works without stopping, but the refrigerator still freezes the food, there are two possible problems. problems:

1. Compressor jamming in maximum power mode (for example, due to wear of the piston group).
2. Failure of the start relaywhich does not turn off the motor at the command of the thermostat.

Signs of a compressor malfunction:

• 🔊 The motor hums louder than usual, vibrates or makes knocking sounds.
• 🌡️ The temperature in the chambers is unstable (either too low or rising).
• 🔌 The compressor housing is hot to the touch (more than 60–70°C).

What to do:

• 🛠️ Start relay you can replace it yourself (the cost of the part is 500–1,500 ₽ It is located next to the compressor and is attached with latches.
• 🔧 Compressor in 90% of cases requires professional repair or replacement (the price of a new one is from 5,000 ₽).

To diagnose the relay:

1. Turn off the refrigerator and remove the relay from the compressor.
2. Test the contacts with a multimeter in resistance mode. There should be resistance between the terminals S and M If the readings are no - the relay is faulty. 20–40 Ohm.
3. If there is no reading, the relay is faulty.

FAQ: Frequently asked questions about freezing in No Frost

Is it possible to disable No Frost and switch the refrigerator to normal mode?

No, the system No Frost is a design feature of the refrigerator, and it is impossible to turn it off. However, in some models (for example, Samsung RL60T6there is a mode Vacationthat reduces the cooling intensity during prolonged absence.

Why did the refrigerator start to freeze even more after defrosting?

The temperature sensor was probably damaged during defrosting or the fan operation was disrupted. Check whether the fan blade rotates freely and whether there is ice on the evaporator. The electronic module may also have failed - try resetting the settings (see section 4).

How often should you defrost a No Frost refrigerator?

Refrigerators No Frost do not require regular defrosting, but it is recommended to turn them off 1-2 times a year to clean the ventilation ducts and evaporator. If ice appears on the back wall, this is a sign of a malfunction (see section 2).

Could freezing be related to how often the door is opened?

Yes, if the door is opened too often (for example, in hot weather), the refrigerator tries to compensate for the flow of warm air and works harder. However, normally the temperature should be restored in 10-15 minutes. If freezing continues longer, look for a fault (see sections. 3–7).

Is it worth repairing an old No Frost refrigerator or is it better to buy a new one?

If the cost of repairs exceeds 50% of the price of a new refrigerator (for example, replacing a compressor or electronic module in a model older than 10 years), it is more advisable to consider purchasing new equipment (for example, LG InstaView or Samsung Bespoke) more energy efficient and quieter.