The situation when, instead of fresh vegetables and chilled meat, you find ice blocks in the main chamber is familiar to many owners of household appliances. Freezing food not only spoils their taste and destroys the structure, but also indicates serious malfunctions in the operation of the unit. Ignoring this problem can lead to failure of expensive components and the need for complete repairs.
Often users mistakenly believe that it is enough to simply reduce the power of the compressor, but the root of the evil may lie deeper. In this article we will analyze in detail why the refrigerator freezes food in the refrigerator compartment, and what steps need to be taken to eliminate the malfunction.
It is important to understand that modern cooling systems are a complex mechanism, where each element affects the overall temperature regime. Heat transfer disturbance or failure in electronics can cause a “hypothermia” effect, which requires immediate intervention.
Incorrect thermostat setting
The most common, but common reason lies in incorrect temperature settings. Users often set too low values, not taking into account seasonality or the degree of loading of the chambers. Thermoregulator is a device that sends a signal to the compressor to turn on or off, and if it is set to maximum cold, the equipment will work without interruption.
In models with electronic control, a failure may occur due to a power surge in network, after which temperature controller may go astray to factory or extreme values. Mechanical regulators, represented by rotating knobs, can become loose over time, and the number on the scale no longer corresponds to the actual position of the damper.
- ❄️ Check the current value on the display or the position of the regulator knob.
- 🌡️ Make sure that the temperature is set in the range from +2 to +5 degrees.
- 🔌 Try resetting the settings to factory settings.
If after adjustment the situation does not change within 12-24 hours, then the problem is not in the settings, but in a technical malfunction. Electronic module may not receive correct data from the sensors, continuing to drive compressor.
⚠️ Attention: Do not set the minimum temperature (“Max Cold”) on a permanent basis. This mode is intended only for quick freezing of large volumes of food and should be turned off automatically or manually after a short time.
Faults in the temperature sensor and thermostat
When the refrigerator starts freezing food, the first suspect often becomes thermostat (in mechanical models) or air sensor (in No Frost systems). These components are responsible for controlling the climate inside the chamber. If the thermostat is “stuck” in the closed position, it continuously supplies current to the compressor, forcing it to work without stopping.
In units with a system No Frost the temperature is monitored by a special sensor located on the back wall. If it breaks or the contacts oxidize, the control board receives a false signal that the chamber is warm. As a result, control module does not give a command to stop the compressor, and the temperature drops below zero.
Diagnostics of these elements requires the use of a multimeter to check the resistance. Often the defect lies not in the sensor itself, but in a break in the wiring going to it, especially in bends or near door hinges.
How to check the thermostat yourself?
To check a mechanical thermostat, you can carefully remove it (after disconnecting the refrigerator from the network) and check the contacts with a tester. At room temperature the contacts should be closed. If during cooling (for example, by putting it in the freezer for 15 minutes) the circuit does not open, the thermostat is faulty.
Replacing a temperature sensor is a procedure that requires care, since it is often necessary to partially disassemble the inner lining of the chamber. New sensor must have exactly the same characteristics as the failed one, otherwise there will be an error in the readings will remain.
Problems with the cold air supply damper
In two-chamber refrigerators, especially in models with one compressor, cold is supplied to the upper compartment through a special channel from the freezer. Regulates this flow damper (damper). If the damper mechanism is stuck in the open position or the damper drive is broken, cold air freely enters the refrigerator compartment.
This leads to rapid and severe overcooling of the products located directly in front of the air duct exit. Often, vegetables and fruits on the top shelf are the first to suffer, turning into lumps of ice while the temperature in the freezer remains normal.
- 🚪 Inspect the damper for mechanical obstacles (pieces of ice, packaging).
- 🔧 Check the operation of the damper drive motor (can you hear a click when turned on).
- 🧊 Make sure that the air duct is not clogged with a snow coat.
Sometimes the reason is trivial: the user stuffed the food too tightly to the back wall, blocking the outlet, or, conversely, left the duct door open after defrosting. Impaired circulation air can cause chaotic behavior of the damper.
⚠️ Attention: If you find that the damper is covered with a thick layer of frost, do not try to pick it out with a knife. This may damage the plastic parts or puncture the channel. Allow the unit to completely defrost within 24 hours.
Failures in the No Frost system
The system No Frost (or Low Frost) implies the absence of ice on products due to the constant circulation of dry cold air. However, if this system fails, it can turn the refrigerator compartment into a freezer. The key element here is evaporator and its defrosting system.
If the defrost heating element, timer or defrost sensor fails, a “fur coat” begins to grow on the evaporator. At some point, the ice blocks the channels, and the fan begins to drive ice chips directly into the chamber. In another scenario, the defrost sensor may “lie” that there is no ice, and the compressor will work longer than necessary, cooling the entire space.
Signs of such problems are often:
- 🌬️ Constant hum of the working fan.
- 🧊 The presence of ice or frost on the back wall of the refrigerator compartment.
- 💧 Water on the floor under the refrigerator (if the ice melts unevenly).
Diagnostics of the No Frost system is complex and requires disassembling the rear panel inside the freezer or refrigerator compartment (depending on the model). It is necessary to check the resistance of the heating element and the integrity of the fuse.
Freon leakage and compressor operation
It would seem that if there is a refrigerant leak (freon), the refrigerator should stop freezing at all. However, in some cases, especially at the initial stage of a leak or when the thermostat is faulty, the opposite effect is observed. The compressor, trying to reach the set temperature when there is a shortage of freon, works without stopping.
As a result of such an endless cycle of operation the motor-compressor can overheat, and conditions are created in the evaporator under which in one part of the system (near the outlet from the evaporator) the temperature will be extremely low, freezing food, although the overall refrigeration capacity has dropped.
The table below will help differentiate leak symptoms from other problems:
| Symptom | Probable cause | Compressor behavior |
|---|---|---|
| The food is frozen, only one wall is cold | Partial leak of freon | Works without interruption |
| The refrigerator does not freeze at all | Complete leak freon | Works or stops (depending on the thermostat) |
| Freezing throughout the entire volume | Thermostat/sensor is faulty | Works without interruption |
For accurate diagnostics leaks require a technician with a leak detector. You can independently only visually inspect the condenser tubes (the grille at the back) for swelling or traces of oil, which often accompany depressurization depressurization of the circuit.
☑️ Diagnostics before calling a technician
The influence of seals and tightness
Paradoxically, a door that is not tightly closed can lead to freezing. When warm, moist air constantly enters the chamber, sensors record an increase in temperature. In response the control system commands the compressor to work harder to compensate for the heat gain.
As a result, the unit enters the “perpetual motion machine” mode, cooling the internal space to a minimum. This is especially noticeable in winter or in rooms with high humidity. Rubber seal must be clean, elastic and fit tightly around the entire perimeter.
Check the condition of the seal:
- 👀 Visually inspect for cracks, tears or contamination.
- 📄 Use a test with a sheet of paper: hold the sheet with the door and try to pull it out. If it comes out too easily, the clamp is weak.
- 🧼 Wipe the seal with soapy water to remove fat that interferes with the seal.
⚠️ Attention: If the seal is deformed (crumpled), try restoring its shape using a hair dryer (gently heating and straightening) or boiling water. In case of serious damage, the circuit will need to be replaced.
Frequently asked questions (FAQ)
Why do food freeze near the back wall of the refrigerator?
The back wall in refrigerators with a drip defrost or No Frost system is where cold air exits or the evaporator is located. The temperature here is always lower than in the center of the chamber. If food touches the wall, it may freeze. The optimal distance from food to the back wall should be 3-5 cm for normal air circulation.
Can the refrigerator freeze due to the heat in the room?
Yes, If the room is very hot, the thermostat may not have time to respond to the rapid heating of food, and the compressor will work longer. However, more often in hot weather, the refrigerator, on the contrary, cannot cope with cooling. Freezing due to heat is only possible if the thermoregulation is faulty.
What to do if, after defrosting, the refrigerator begins to freeze more strongly?
This may be due to the fact that after defrosting you turned on the “Super Freeze” mode and forgot to turn it off, or the settings of the electronic module were lost. Try unplugging the refrigerator for 15-20 minutes to reboot the control board.
How does the amount of food affect the temperature in the chamber?
A full refrigerator keeps the temperature more stable, as the food accumulates cold. An empty refrigerator heats up faster when the door is opened, causing the compressor to turn on more often, but it should only start to freeze if the sensors are faulty.