The situation when frozen vegetables, burst jars of sauce or soup that has turned into ice in the refrigerator instead of fresh food is familiar to many owners of household appliances. This is not just a household discomfort, but a direct signal of a serious malfunction thermal control systems. The unit stops responding to the achievement of the set temperature and continues to pump in cold, ignoring the needs of the products in the refrigeration compartment.
Such a malfunction cannot be ignored, as this leads to spoilage of supplies, increased energy consumption and, ultimately, to failure compressor due to operation in the non-stop. In most cases, the problem lies in one of the key temperature control elements, but accurate diagnosis requires an understanding of the operating principles of your unit.
In this article we will analyze in detail why the refrigerator began to freeze food to the point of ice, which components most often fail and whether it is possible to fix the breakdown yourself without calling a technician. Understanding the reasons will help you make the right decision to repair or replace the part.
The principle of operation of the cooling and thermoregulation system
To understand why the failure occurred, you need to briefly refresh your memory on the basic principle of operation of the refrigeration circuit. Cooling occurs due to the circulation of the refrigerant, which, evaporating in evaporator, takes heat from the chambers. The key element here is a sensor or thermostat that monitors the air temperature and instructs the compressor to stop when the target is reached.
If this cycle is broken, the compressor continues to run indefinitely, pumping out cold until the entire contents turn into a block of ice. In modern models with a system No Frost an electronic control module and several sensors are responsible for this process, while in older models there is a mechanical thermostat.
It is important to distinguish between normal operation and pathology. Short-term freezing at the back wall is possible when loading a large amount of warm products, but if ice forms throughout the entire volume and remains constant, this is a malfunction.
Thermostat and thermostat malfunctions
The most common reason why a refrigerator starts to freeze more than usual is a thermostat failure. This mechanical or electronic component is responsible for breaking the compressor's power supply circuit. If its contacts “stick” in a closed state or it loses sensitivity, the compressor simply does not receive a signal to stop.
In mechanical models, the thermostat is often a tube with gas that is attached to the evaporator. Over time, gas may escape through microcracks, or the bellows will lose elasticity. As a result, the device “thinks” that the chamber is too warm and requires the motor to work even harder.
Diagnostics of a mechanical thermostat is possible at home, but requires caution. It is necessary to remove the regulator, immerse its sensitive tube in cold water with ice and ring the contacts with a tester. If, when cooling, there is no click and no change in resistance readings, the part must be replaced..
How to check a thermostat without a tester?
There is a risky “short circuit” method. If when connecting the wires going to the thermostat directly (bypassing it), the compressor starts, but when connected through the regulator it does not, then the problem is in the thermostat. However, this method requires skills in working with electricity.
Failure of the electronic control module
In modern refrigerators, such as LG, Samsung or Bosch, the thermostat function is performed by an electronic “brain”. If the control board is exposed to power surges or moisture, it may begin to issue erroneous commands. In this case, the compressor receives a signal to operate continuously, ignoring the readings of the temperature sensors.
Often, module failure is accompanied by other oddities: blinking indicators, display failure, or chaotic turning on and off of the unit. Self-repair of an electronic unit is only possible if you have deep knowledge of radio engineering and the circuitry of a specific model.
In some cases, the problem is solved by resetting errors, but if the microcircuit is physically burned out, professional resoldering or replacement of the entire unit will be required. This is an expensive procedure, so accurate diagnosis is critically important here.
Refrigerant leakage and compressor operation
Paradoxically, a freon leak can also lead to excessive freezing. If there is a lack of refrigerant in the system, the pressure drops, and the compressor, trying to compensate for the lack of cold, begins to work without interruption. As a result, the evaporator is overcooled, and the cold, which should be distributed evenly, is concentrated at one point or is pumped too intensely.
The leak can be determined by indirect signs: hot sides of the case (in models where the condenser is located there), swelling of the back wall inside the chamber or a characteristic whistling sound when the tube is punctured (if you decide to diagnose). Also a sign may be a lack of cold in the far corners of the chamber during severe frost at the back wall.
Eliminating a leak is a complex technical process that requires:
- 🔍 Finding the place of depressurization (often this is a foamed area).
- 🔧 Sealing the tubes and replacing them filter-drier.
- ❄️ Evacuating the system and filling with new freon by weight.
Problems with the damper and system No Frost
In refrigerators with a system No Frost and two compressors (or one, but with flow separation), the air damper is responsible for supplying cold to the refrigeration chamber. It regulates the amount of cold air coming from the freezer. If the damper is stuck in the open position or its drive is broken, an excess volume of icy air will enter the chamber.
Also, the cause may be a malfunction of the defrost sensor or heating element, which leads to fouling of the evaporator with ice. The fan begins to drive this cold air directly into the chamber, bypassing the buffer zones. Visually, this is often accompanied by a fan whistling or hum.
Checking the damper requires partial disassembly of the inner casing. You must ensure that the damper moves freely and responds to module commands. In some models, for example Indesit or Atlant, the damper is controlled mechanically, in others - by an electronic motor.
☑️ Diagnostics of the No Frost system
Diagnostic table of main faults
To make it easier to find the problem, we suggest you read with a summary table of symptoms. This will help you quickly understand the nature of the breakdown before the technician arrives or before purchasing spare parts.
| Symptom | Probable cause | Difficulty of repair | Necessary tools |
|---|---|---|---|
| The compressor does not turn off, the food is frozen | The thermostat/thermostat is faulty | Low | Tester, screwdriver |
| Ice only at the back wall, compressor buzzing | Freon leak or capillary blockage | High | Vacuumator, pressure gauge, burner |
| Chaotic operation, blinking indicators | Failure electronic module | Medium/High | Soldering iron, circuit, tester |
| Intense cold, but no air circulation | Air damper jammed | Medium | Screwdriver, multimeter |
Can you fix the problem yourself?
The answer to this question depends on the type of fault and your skills. Replacing a thermostat or cleaning a drain hole are tasks that can be completed by a careful person with a minimum set of tools. However, intervention in the refrigeration circuit (replacing freon, soldering) requires a license and special equipment.
If you notice that the refrigerator has begun to behave strangely, first of all, defrost it completely (at least 24 hours). Sometimes this helps clear electronic errors and defrost hidden ice blocking the sensors. If, after switching on, the problem returns after a few hours, you cannot do without repairs.
You should not delay contacting service if:
- 🔥 The compressor has been running continuously for more than 24 hours.
- 💧 Traces of oil have appeared near the compressor or pipes.
- ⚡ You smell burning or plastic.
Why can't you ignore wear and tear?
When the compressor works non-stop, it overheats. The oil in it loses its properties, the piston group wears out, and eventually the engine burns out. The cost of replacing a compressor is 3-4 times higher than replacing a thermostat.
Prevention and proper operation
To avoid situations where a refrigerator turns into a freezer, it is important to follow the operating rules. Do not load food into the chamber whose temperature is significantly higher than room temperature. This creates a false sense of “warmth” for the sensors, causing the unit to work at its limit.
Check the rubber seals on the doors regularly. If they do not fit tightly, warm, moist air enters, which provokes a build-up of fur and malfunctions of the defrost system. Also keep the condenser (grid at the back) clean, as dust impairs heat transfer.
⚠️ Attention: If your refrigerator is equipped with the “Super Freeze” or “Super Cool” function, make sure that it is not turned on accidentally. In this mode, the unit operates continuously for up to 72 hours, ignoring the thermostat, which leads to freezing of products in the main chamber.
Timely maintenance and careful attention to the “behavior” of your equipment will extend its service life and keep your products fresh. Remember that constant operation of the compressor without stopping is an emergency mode that should last no more than a few hours.
Why does bottled water freeze in the refrigerator, but vegetables are still intact?
Water freezes at 0°C, while the cellular structure of vegetables begins to collapse at lower temperatures (about -1...-2°C). This is an intermediate stage of failure: the temperature in the chamber has already dropped below zero, but has not yet reached the critical values of the freezer. This is a signal for immediate action.
Can incorrect installation cause such a problem?
Yes. If the refrigerator is installed close to the wall or in a niche without gaps, the air circulation around the condenser is disrupted. The unit overheats, the cooling efficiency drops, and the compressor starts working longer, trying to compensate for the losses, which can lead to freezing.
Is it dangerous to continue using a refrigerator that freezes very much?
In the short term - yes, food can be saved by rearranging it. But long-term operation in this mode is dangerous for the unit itself. This leads to degradation of the oil in the compressor and eventual engine failure. Savings on repairs can now result in the purchase of a new refrigerator.