The situation when the temperature in the freezer rises to values typical for the refrigerator compartment always becomes an unpleasant surprise. Instead of the expected minus 18 degrees, the thermometer shows positive values, which jeopardizes the safety of stocks of meat, fish and semi-finished products. This is not just an inconvenience, but a signal of a serious malfunction in the cooling system of your unit.
The reasons for this behavior of the equipment can vary from the banal loose closing of the door to the failure of an expensive compressor. Critically important React in a timely manner to changes in temperature conditions, since defrosting food triggers irreversible bacterial growth processes. In this material, we will analyze in detail the mechanics of this problem.
Understanding the principles of operation of the refrigeration circuit will help you not only diagnose the breakdown, but also, possibly, fix it yourself without calling a technician. However, it is worth remembering that some malfunctions require the intervention of professionals using specialized equipment for refrigerant charging.
Checking temperature conditions and settings
Before sounding the alarm and looking for hardware failures, you need to make sure that the problem does not lie in a software failure or accidental change in settings. Modern models, such as LG InstaView or Samsung Family Hub, have a complex control system that can be easily knocked down by a careless touch. Sometimes users switch the operating mode themselves without noticing it.
Check the digital display or the position of the mechanical dial. If the freezer is the same temperature as the refrigerator, the Holiday or Eco mode may be activated, which specifically raises the temperature in the freezer to save energy. It is also worth eliminating food overload that blocks the air ducts.
⚠️ Attention: If you are using an electronically controlled model, try performing a full reset (Hard Reset) by unplugging the device for 15-20 minutes. This often helps eliminate software errors in the controller.
Pay attention to the following indicators and parameters:
- ❄️ "Super Freeze" mode —if it was turned on for a long time, the automation could turn it off due to system overheating, knocking down the settings.
- 🌡️ Temperature sensors —check if are they blocked by products, as this distorts the readings for the control unit.
- 🔌 Voltage stability - surges in the network could cause a malfunction in the control board that reset the factory parameters.
- 🚪 Setting tightness - even a microscopic gap may not allow you to dial the desired temperature, simulating a breakdown.
If after After checking the settings and rebooting, the situation has not changed, and the freezer compartment is still warm, it is necessary to move on to a more in-depth diagnosis of the technical condition of the unit.
Faults of the No Frost system
In refrigerators with a system No Frost circulation of cold air is carried out forcibly using a fan. If the freezer is at the same temperature as a refrigerator, this often indicates that cold air is simply not reaching the evaporator or is not circulating through the chambers. The main culprit here is ice, which blocks the air channels.
During normal operation of the system, excess moisture is removed through the drainage hole. However, if the drain becomes clogged or the defrost heater fails, a “fur coat” will build up on the evaporator. The fan starts to hum or stops, stopping moving cold air. As a result, the freezer gets warmer, and in the refrigerator compartment, on the contrary, it can become too cold or too warm, depending on the circuit.
☑️ Diagnostics of the No Frost system
To identify this problem, partial disassembly of the rear panel inside the freezer is often required. A visual inspection will show whether there is a layer of ice on the evaporator. If the fan Evaporator Fan is frozen in ice, it will physically not be able to rotate.
Symptoms of a malfunctioning defrost system:
- 🔊 Stranger noise —humming or crackling, indicating that the fan blades are touching the ice.
- 💨 Lack of air flow —if you put your hand near the air supply holes, the flow will be barely noticeable or absent.
- 💧 Water on floor —melt water does not go into the drain and flows out, which indirectly indicates problems with the defrost cycle.
- 🧊 Ice build-up - visible when removing the plastic panel of the rear wall of the freezer.
What will happen if you ignore the ice in No Frost?
If the ice is not removed, the compressor will work for wear, trying to compensate for the lack of cold, which will lead to overheating and eventual combustion of windings. In addition, ice can damage the fan blades.
Problems with the compressor and refrigerant
The most serious reason why the temperature in the freezer becomes positive is a malfunction of the compressor or a freon leak. The compressor is the “heart” of the refrigerator, and if it does not create sufficient pressure in the system, the refrigerant will not be able to effectively cool the evaporator.
Leakage of refrigerant (freon, isobutane) often occurs due to corrosion of the evaporator tubes, especially in models with a foamed circuit. It is impossible to visually see the leak, since the gas is colorless and odorless. However, an indirect sign is that the compressor works almost non-stop, hums, but does not produce cold in any of the compartments.
The table below shows the main symptoms of compressor group malfunctions:
| Symptom | Probable cause | Nature of operation compressor | Temperature in the chamber |
|---|---|---|---|
| Buzzes and clicks without starting | The starting relay is faulty or the compressor is jammed | Short-term attempts to start | Increases to room temperature |
| Works continuously | Freon leak or clogged capillary tube | No stops, hot condenser | Above normal (-5...+5°C) |
| Works jerkily | Problems with electronics or sensors | Frequent on/off | Unstable |
| Gets very hot body | Overload, motor wear | Long operation | Gradually increasing |
⚠️ Attention: Self-filling the refrigerator with freon is prohibited without a license and special equipment. An attempt to refuel “by eye” will lead to compressor failure. If you suspect a leak, call a professional.
If the compressor is hot to the touch (especially in the area of the discharge tube), but the refrigerator does not freeze, this is almost guaranteed to indicate a leak or, less commonly, a blockage in the system. In such cases, professional repairs are required, including replacing the filter-drier and evacuating the system.
Malfunctions of the thermostat and sensors
Thermostats (in mechanical models) or air sensors (in electronic models) are responsible for maintaining the set temperature in refrigerators. If the temperature in the freezer is the same as in the refrigerator, perhaps the “smart” system simply does not receive a signal that it needs to turn on the cooling.
In mechanical models, the thermostat is a device with a bellows filled with refrigerant. When the temperature drops, the gas compresses, the contacts open and the compressor turns off. If the bellows has lost its tightness or the contacts have oxidized, the compressor may not turn on at all, even when the chamber is warm.
In electronic models, thermistors are responsible for this. Their resistance changes depending on temperature. If the sensor “lies” and shows the controller that the freezer is -20°C, when in fact it is +5°C, the compressor will not start. Replacing the sensor is a simple procedure, but requires testing with a multimeter.
- 🔧 Mechanical thermostat - often fails due to aging of the spring or gas leakage from the sensitive tube.
- 📡 Air sensor —may become dirty, which leads to inertia of readings and a delayed response of the system.
- 🖥️ Control module —the board may incorrectly read the readings of a working sensor due to oxidation of the contacts.
- 🧊 Thermostat tube —in older models it could have shifted, ceasing to contact the evaporator.
Diagnostics of sensors requires a multimeter. It is necessary to remove the sensor, place it in water with ice and measure the resistance, comparing the readings with the table for a specific refrigerator model.
Damage to the door seal
One of the most common but ignored reasons for the increase in temperature in the freezer is a loose fit of the rubber seal (cuff) of the door. Through the resulting cracks, warm, moist air from the room constantly enters the chamber.
The cooling system tries to compensate for the heat influx and works at the limit of its capabilities, but does not have time to freeze. As a result, the temperature in the freezer is set close to the temperature in the refrigerator, and a thick layer of frost forms on the walls and food.
How to check the tightness:
- 📄 Test with paper - clamp a sheet of paper with the door around the perimeter. If it is pulled out without resistance, the seal does not hold.
- 👀 Visual inspection - look for cracks, abrasions, dents or peeling of rubber from the door body.
- 🧹 Contamination - sticky residue from food interferes tight fit, it needs to be washed off with warm water and soap.
- 🔥 Deformation —the rubber could “get hard” from time or cold, losing elasticity.
If the seal is simply dirty or has come off a little, it can be wash and glue (using special glue for rubber). If the rubber has cracked or become hard, only complete replacement of the cuff with a new original spare part will help.
Methods of elimination and prevention
What to do if you find that the temperature in the freezer is the same as in the refrigerator? The algorithm of actions depends on the identified cause. In most cases, if the problem is not related to a freon leak, you can try to solve it yourself.
The first and most effective step for systems No Frost and even drip refrigerators is complete defrosting. It is necessary to disconnect the device from the mains, remove all products and leave the doors open for at least 24 hours (preferably for a day). This will allow the ice in the hidden channels and on the evaporator to completely melt.
⚠️ Attention: Do not use hair dryers, knives or other sharp objects to speed up defrosting. Mechanical damage to the evaporator tubes will lead to an immediate leak of freon and expensive repairs.
After defrosting, turn on the refrigerator and let it run empty for 2-3 hours. If the temperature began to drop and reached normal, the problem was ice. If the situation repeats after a week, it means that one of the components (defrost heating element, timer, sensor) is faulty.
Preventive measures for stable operation:
- 🧼 Regular washing —wipe the seals and drainage hole every 3-4 months.
- 🌡️ Load control —do not overcrowd the freezer, the air should circulate freely.
- 🚫 Prohibition of hot food —never put warm foods in the chamber, this upsets the thermal balance.
- 🔌 Surge protection —use voltage stabilizer to protect the electronics and compressor.
If the problem persists after defrosting and checking the seal, and the compressor works continuously or does not turn on at all - you need to call a specialist to diagnose the electrical part and the tightness of the circuit.
Frequently asked questions (FAQ)
Why is it warm in the freezer, but on the contrary, it is too cold in the refrigerator?
This is a classic sign of a system malfunction No Frost. Most likely, the evaporator is frozen, and the cold air from the freezer does not get where it should, or the flow channel is clogged. It is also possible that the air flow control damper gets stuck in the open position.
Is it possible to operate the refrigerator if the freezer is +5 degrees?
For a short period of time - yes, to finish up the reserves. But you can’t work like this for long. The compressor will run non-stop trying to reach the target temperature, causing it to overheat and burn out. Food in such conditions will quickly deteriorate.
How long does it take for the freezer to reach temperature after defrosting?
Usually, an empty chamber takes from 2 to 4 hours to reach a temperature of -18°C. If the refrigerator is old or loaded with food, this process may take up to 12-24 hours. If the temperature has not dropped below -10°C during the day, then there is a malfunction.
Does the compressor hum when there is a freon leak?
Yes, when there is a freon leak, the compressor often works louder than usual or continuously, since the temperature sensors do not detect cooling and do not give a command to turn off. However, in some cases, it may not start at all if the thermal protection has tripped.