The refrigerator does not freeze well: what to do and how to find the reason

Did you notice that the food in the freezer began to thaw, and frost appeared on the walls instead of the usual ice layer? Or does the refrigerator run non-stop, but the temperature never drops to the desired level? Weak freezing is one of the most common malfunctions that can occur in both old Samsung RL-33and new LG InstaView systems No Frost. The reasons lie in different components: from a banal clogging of the fan to a serious refrigerant leak.

In this article we will look at why the refrigerator does not freeze well - from those that can be fixed independently in 10 minutes, to those that require the intervention of a specialist. You will learn how to check the thermostat, sensors and compressor without special tools, as well as when to sound the alarm and call service. 12 main reasonsproblems for which the refrigerator freezes poorly - from those that can be fixed on your own in 10 minutes, to those that require the intervention of a specialist. You will learn how to check the thermostat, sensors and compressor without special tools, and also when to sound the alarm and call for service. We will pay special attention to models with electronic control (for example, Bosch KAN92VI30R or Indesit ITF 118 W), where failures in the firmware can simulate equipment breakdown.

Before starting diagnostics, unplug the refrigerator and remove all products - this will protect them from damage and make it easier to access internal parts. If the freezer is still a little cold, transfer perishable food to a cooler bag or wrap it in newspaper for temporary insulation.

1. Incorrect temperature settings

The first thing to check is refrigerator operating mode. Often, users accidentally change the settings, turn on the “Vacation” mode, or set the temperature in the freezer to +5°C instead of −18°C. In electronic models (for example Samsung RB37J5240SA) this can happen after a power surge or an error in the firmware.

How to check:

• 🔍 On mechanical refrigerators (Atlant XM-4021, Biryusa 145) turn the temperature control to maximum (usually this is position “5” or “7”) and listen - the compressor should start working with a characteristic hum.
• 📱 In electronic models, go to the menu (button Menu or Settings) and check the current freezer temperature. Optimal value: −18°C for storing meat and −24°C for quick freezing.
• ❄️ If your model has a function Super Freeze (for example, in Liebherr CNef 4815), make sure it is activated - it temporarily lowers the temperature for intensive freezing.

If after changing the settings the refrigerator starts to freeze better, the problem is solved. If not, move on to the next point. Please note that in some models (for example, Haier C2F636CWG), the settings for the freezer and refrigerator compartments are separate - check both regulators.

2. Clogging of the No Frost system or fan

In refrigerators with a system No Frost (for example, Electrolux ERN 1400 FOW or BEKO GNE 114620 X), weak frost is often associated with freezing of the fan or clogging of the air ducts. Ice on the fan blades blocks the circulation of cold air, and the freezer stops cooling evenly.

Signs of a problem:

• ❄️ There is a thick layer of ice (more than 1 cm) on the back wall of the freezer.
• 🔇 The refrigerator is louder usual, but it freezes weakly.
• 🌬️ Cold air does not blow from the freezer (check with your hand).

How to fix:

1. Unplug the refrigerator and remove all the products.
2. Remove the back panel of the freezer (usually it is attached on latches or screws).
3. If the fan is covered with ice, defrost it with a hairdryer (keep it at a distance of 30 cm to avoid damaging the plastic).
4. Check the drainage hole - it could be clogged with crumbs or ice. Clean it with a cotton swab or wire.

If the blockage recurs more than once every 6 months, this may indicate the malfunction of the defrost heater (part that melts the ice in the automatic mode). In this case, you will need to replace the heating element - this is difficult to do without special skills.

3. Failure of the thermostat or temperature sensor

The thermostat (in mechanical models) or temperature sensor (in electronic models) is responsible for turning the compressor on and off. If this element fails, the refrigerator either stops freezing at all, or works continuously, but does not reach the desired temperature.

How to check the thermostat:

• 🔧 In mechanical refrigerators (Atlant MHM-1708, Stinol 101>) turn the temperature control to maximum. If the compressor does not turn on within 5 minutes, the thermostat is faulty.
• 📊 In electronic models (for example, Samsung RL-34 EBSW), a sensor error may be displayed on the display as a code E1, E2 or FF.
• 🔍 Visually inspect the wires, going to the thermostat - they could fray or oxidize.

To replace the thermostat in a mechanical refrigerator you will need:

1. Disconnect the device from the network.
2. Remove the protective cover (usually it is located inside the chamber or behind the refrigerator).
3. Disconnect wires from the thermostat (take a photo of their location!) and replace the part with a new one.

How to check the temperature sensor with a multimeter?

To check the temperature sensor (thermistor) in electronic refrigerators:

1. Unplug the refrigerator.

2. Locate the sensor - it is usually located on the evaporator or in the freezer.

3. Measure the resistance with a multimeter:

- At room temperature (~20°C) the resistance should be ~5 kOhm.

- If the sensor shows an open circuit (OL) or a short circuit (0 Ohm) - it is faulty.

Cost of a new thermostat for popular models:

Attention! In refrigerators with electronic control (for example, Bosch KGE39XL40R) replacing the sensor requires flashing the module. Without this, the new part may not work or produce errors.

4. Freon leakage or clogged capillary tube

If the refrigerator runs non-stop, but freezes poorly, it is possible refrigerant (freon) leak clogging of the capillary system. This is a serious breakdown that requires professional repair. Signs:

• 🔊 The compressor hums constantly, but the temperature does not drop.
• 🧊 The condenser (grid at the back of the refrigerator) remains cold.
• 🛠️ Oil stains are visible on the tubes or in the soldering areas (a sign of leakage).

Causes of leakage:

• 🔧 Mechanical damage to the tubes (for example, when moving the refrigerator).
• 🕳️ Corrosion of aluminum tubes in old models (ZIL-63, Minsk-15M).
• 🔥 Overheating of the compressor due to a faulty fan.

Clogging of the capillary tube occurs due to moisture or oil entering the system. In this case, the compressor wears out, but freon does not circulate. The danger is that prolonged operation in this mode leads to overheating of the compressor and its breakdown - repairs will cost 50-70% of the cost of a new refrigerator.

What to do:

1. Disconnect the refrigerator and call a specialist. Self-repair without equipment for vacuuming and refilling freon is impossible.
2. If the refrigerator is under warranty, do not try to repair it yourself - this will void the warranty.

5. Compressor malfunction

The compressor is the “heart” of the refrigerator, which pumps freon through the system. If it does not work efficiently or fails altogether, the freezer will stop cooling. Signs of malfunction:

• 🔇 The refrigerator does not turn on or makes clicking noises without starting.
• 🔥 The compressor body is hot (more than 70°C during operation).
• 🕒 The compressor runs for 2-3 minutes and turns off (the thermal protection).

How to check the compressor:

1. Unplug the refrigerator.
2. Remove the back cover (in most models the compressor is located at the bottom).
3. Test the windings with a multimeter:
   • Resistance between terminals C-S (common and starting winding): ~20–40 Ohm.
   • Resistance between C-R (common and working winding): ~10–15 Ohm.
   • If the device shows an open circuit (OL) or a short circuit (0 Ohm), the compressor is faulty.

Causes of compressor failure:

• 🔌 Voltage surges (especially important for cottages and rural areas).
• 🛠️ Long-term operation if freon leaks or the system is clogged.
• ⏳ Natural wear (compressor service life is 10–15 years).

Cost of a new compressor for popular brands:

⚠️ Attention! Replacing the compressor requires a complete refill of the system with freon and evacuation. This cannot be done without special equipment. If the refrigerator is more than 10 years old, consider buying a new one - repairs can cost 60–80% of its cost.

6. Problems with the door seal

A worn or dirty seal allows warm air into the freezer, causing the temperature to rise. This is one of the most common causes of weak freezing, which can be easily eliminated yourself.

How to check the seal:

• 📏 Close the door and check the gap - it should not exceed 2 mm. Use a strip of paper: if it pulls out easily, the seal is not airtight.
• 🔍 Inspect the rubber for cracks, tears or deformations.
• 🧼 Check for grease or dirt on the seal - they interfere with a tight seal.

How to restore seal:

1. Wash the rubber with warm water and soap, then dry.
2. If the seal is deformed, heat it with a hairdryer (temperature 50–60°C) and shape it into the desired shape.
3. For temporary repair of small cracks, use silicone sealant.

If the seal is completely worn out, it must be replaced. The cost of new rubber for popular models:

• Atlant XM-4021: 1 200–1 800 ₽;
• Samsung RL-33: 2 000–2 500 ₽;
• Indesit ITF 118 W: 1 500–2 000 ₽.

⚠️ Attention! After replacing the seal, check the operation of the door: it should open with slight force. If the door opens too easily, adjust the hinges or add magnetic tape for a better fit.

7. Failures in the electronic control module

In modern refrigerators with a display (LG InstaView, Samsung Family Hub, Bosch VitaFresh), weak freezing may be associated with a failure in the firmware or a malfunction of the control board. Signs:

• 📵 The refrigerator does not respond to button presses.
• 🔄 The temperature on the display flashes or is displayed incorrectly.
• 🔌 The appliance turns on/off spontaneously.

How to fix:

1. Disconnect the refrigerator from the network for 10 minutes, then turn it on again - this will clear temporary errors.
2. If the error code is on the display (for example, E1, Er FS), check it with the instructions. For Samsung the code E1 means a problem with the sensor, and for LG it means a fan malfunction.
3. Update the firmware if the manufacturer has released a new version. For Bosch i Siemens this can be done via USB ports.

If the reset does not help, you will need to diagnose the board. Average repair cost:

• Replacement of capacitors: 1,500–2,500 ₽;
• Repair of board tracks: 3,000–5,000 ₽;
• Full module replacement: 8,000–15,000 ₽.

⚠️ Attention! Do not try to solder the board yourself without experience - this may lead to a short circuit. In service centers, oscilloscopes and special testers are used for diagnostics.

8. Overloading the freezer

If the freezer is filled to capacity with food, the circulation of cold air is disrupted and the temperature is distributed unevenly. This is especially true for models with No Frost, where the fan must move air freely.

How to check:

• 📦 Take out all the products and check whether cold air is blowing from the vents.
• ❄️ If on the products in there is ice in the center of the chamber, and they have melted at the edges - the problem is overload.
• 🌡️ Use a thermometer: the temperature in different parts of the chamber should differ by no more than 2-3°C.

Recommendations for loading:

• 🍖 Do not place food close to walls - leave a gap of 2-3 cm.
• 🥩 Pre-divide large pieces of meat or poultry into portions.
• 🧊 Do not put hot or warm foods in the freezer - this increases the temperature and increases the load on the compressor.

⚠️ Attention! In refrigerators c Low Frost (for example, Liebherr CPesf 4023) overloading the lower shelves can block the evaporator, which will lead to freezing and weak freezing.

FAQ: Frequently asked questions about weak freezing

Is it possible to fill the refrigerator with freon yourself?

No. Refilling freon requires special equipment (vacuum pump, pressure manifold, refrigerant cylinder) and a certified technician. Self-refilling is dangerous: if the dosage is incorrect, the compressor may fail, and freon leakage harms the environment. In addition, modern refrigerators use non-ozone-depleting refrigerants (for example, R600a or R134a), which are flammable and require careful handling.

Why does the refrigerator freeze poorly after defrosting?

This may be due to several reasons:

1. Moisture on the evaporator: after defrosting, condensation could remain on the tubes, which froze and blocked the circulation of freon. Solution: let the refrigerator stand turned off for 1-2 hours so that the moisture evaporates.
2. Incorrect assembly: if you removed the back panel of the freezer, the tubes may have been damaged or the fan may not have been secured tightly. Check for play in the parts.
3. Electronic module failure: in some models (Samsung RL-44) the settings are lost after defrosting. Try resetting them to factory settings.

If the problem does not disappear after 24 hours, check the defrost sensor or compressor.

How often should you defrost a No Frost refrigerator?

Refrigerators with a system No Frost do not require regular defrosting, but they still need to be cleaned 1-2 times a year. Reasons:

• 🧊 Ice accumulation on the fan (if the drainage hole is clogged).
• 🰲 Pollution of air ducts with dust or crumbs.
• 🦠 Development of bacteria in secluded places (for example, under drawers).

For prevention, it is enough to turn off the refrigerator for 4–6 hours and wipe the internal surfaces with a soda solution (1 tablespoon per 1 liter of water). Do not use sharp objects to remove ice - this can damage the tubes!

Is it worth repairing a refrigerator older than 10 years?

It depends on the nature of the breakdown and the cost of repair:

Type of breakdown	Cost of repair, ₽	Recommendation
Replacement of seal	1 500–2 500	Worth repairing
Freon leak + refill	6 000–10 000	Compare with the cost of a new refrigerator
Replacement of the compressor	8 000–15 000	Most often impractical
Repair of the electronic module	5 000–12 000	Depends on the model

If repairs cost more than 50% of the cost of a new refrigerator, it makes sense to consider purchasing a modern model with class energy consumption A+++ —it will pay off due to energy savings.

Can mild frost be related to the network voltage?

Yes. Refrigerators are sensitive to voltage changes:

• 🔌 Low voltage (less than 190 V): the compressor does not develop the required power, and the temperature in the chamber rises.
• ⚡ High voltage (more than 250 V): can damage the electronic module or compressor.
• 🔄 Frequent surges: lead to malfunctions of sensors and relays.

Solution: use voltage stabilizer (for example, Resanta ASN-1000 N/1-C or Calm IS1000). For dachas and rural areas, models with an input voltage range of 140–260 V are suitable.