The situation when the refrigerator turns on and off at an unnatural frequency or ceases to maintain the set temperature is familiar to many owners of household appliances. This is not just an irritating factor, but a direct signal that a failure has occurred in the cooling system. If the unit operates jerkily, food may spoil and the compressor may fail due to overload. In this material, we will analyze in detail why the refrigerator either freezes or does not freeze, and we will help determine whether you can solve the problem yourself or whether you need to call a specialist.
The first thing to do when If unstable operation is detected, listen to the sounds of the motor and evaluate the duration of the pauses. A normal operating cycle means that the compressor turns on less often than it turns off. If the equipment hums for 5 minutes and rests for 2, or vice versa, it works for days without a break, it means that the balance of heat transfer is disturbed. Cause of malfunction can be hidden either in simple overheating or in a refrigerant leak.
Modern models, be it Indesit, Bosch or LG, are equipped with complex electronics, which may make errors when reading sensor readings. However, even good old two-chamber refrigerators with mechanical controls often suffer from sticking contacts. Understanding how your model works is key to a quick diagnosis. Next, we will look at the main components that most often fail.
Problems with the thermostat and temperature sensors
The most common culprit that the refrigerator has stopped freezing or started to work chaotically is the thermostat (thermostat). This element is responsible for opening and closing the electrical circuit depending on the temperature inside the chamber. If its contacts are oxidized or “stuck,” the compressor may not receive a signal to start or, conversely, may not be able to stop. In models with electronic control, this function is performed temperature sensors, which are also susceptible to breakdowns.
Diagnostics of a mechanical thermostat often requires removing it and “diagnosis” with a multimeter. In electronics, the error is read by a code on the display or characteristic behavior: for example, the refrigerator freezes to -25°C and does not turn off. It is important to note that in two-compressor models (Atlant, Stinol), the thermostats are separate for the freezer and refrigerator compartments, which simplifies the search for defects.
How to check the thermostat without instruments?
Dip the thermostat tube into a glass of cold water (about 5-8 degrees). If the contacts do not click and the circuit does not open, the part is faulty and requires replacement.
When replacing a thermostat, it is critical to choose the right analogue. Different models have different capillary tube lengths and temperature response ranges. Installing an unsuitable part will cause it to break down again, and the products will begin to deteriorate or freeze. operating mode will be disrupted again, and the food will begin to deteriorate or freeze.
Faults of the compressor and start relay
The heart of the refrigeration machine is the compressor. If you hear a click, after which the motor tries to start, hums for a couple of seconds and clicks again, turning off, the problem is in the starting relay or the motor itself. Start relay is a small plastic block that provides an impulse to start the windings. Over time, its contacts burn out and it ceases to perform its function.
A more serious situation is an interturn short circuit in the compressor windings or its mechanical wear. In this case, the engine can heat up to critical temperatures, after which the internal thermal protection relay is triggered and the unit stalls. After cooling, the cycle repeats. This cyclical operation is extremely dangerous for equipment.
- 🔌 Symptom: The hum lasts 3-5 seconds, then a loud click and silence. Probable cause: The starting relay is faulty.
- 🔥 Symptom: The compressor is hot to the touch, works intermittently. Probable cause: Motor wear or problems with the engine cooling system.
- ⚡ Symptom: Complete lack of response to connection to the network. Probable reason: Break winding or burnt filter-drier (rare, but happens during power surges).
If the problem lies in the compressor, self-repair is only possible if you have the skills to work with electricians and solder copper pipes. In most cases, the entire assembly needs to be replaced, which is an expensive procedure. For models Samsung and LG with inverter compressors, diagnosis is even more difficult, since the start is controlled by a separate electronic module.
Freon leak and clogged capillary tube
When a problem occurs in the refrigerant circulation system, the refrigerator begins to behave strangely: it can work for a long time, trying to gain temperature, and then rest for a long time, since the temperature sensor does not detect the cold. Freon leakage is one of the most common reasons loss of productivity. Freon can escape through microcracks in the evaporator (often hidden behind a plastic panel) or through soldering points.
The second option for a hydraulic malfunction is clogged capillary tube. Oil circulates in the system, which over time can coke or freeze (moisture in the system), cutting off the flow of refrigerant. As a result, the pressure in the system increases, the compressor operates with overload, but there is no cold. After some time, when the compressor cools down or the blockage temporarily “releases,” the cycle may repeat.
It is difficult to diagnose a leak or blockage at home. Typically, technicians use leak detectors or simply monitor the pressure in the system. If you notice a swelling of the back wall inside the chamber or yellow rust spots on the back of the body, these are sure signs that circuit tightness the tightness of the circuit is broken
⚠️ Attention: An attempt to independently fill the refrigerator with freon without evacuating the system and replacing the filter-drier will lead to repeated breakdown of the compressor through for a short time. Moisture and air in the system are unacceptable.
The cost of repairs in such cases consists of the work of the technician, the cost of refrigerant and consumables. Sometimes, if the foamed evaporator is corroded, repairs may not be economically feasible, and it is easier to purchase new equipment.
The influence of the No Frost mode and the defrosting system
Owners of equipment with the system No Frost (for example, Indesit, Beko, Haier) often encounter a problem when the refrigerator stops freezing due to a malfunction in the defrosting system. If the defrost heating element, defrost sensor or timer (control module) fails, the evaporator becomes covered with a “coat” of ice. The fan stops driving cold air, and the temperature in the chambers rises.
The compressor at this time can work continuously, trying to compensate for the heat, or turn off due to overheating. A characteristic sign of such a malfunction is that after the refrigerator is completely defrosted (for 24 hours with the doors open), it begins to freeze normally, but after 5-7 days the problem returns.
The main elements of the defrosting system that require checking:
- ❄️ Defrost heating element: The evaporator may have burned out and does not heat.
- 🌡️ Defrost sensor: Does not give a command to turn heating on or off.
- ⏱️ Timer/Module: Does not switch the "cooling" and "defrost" modes.
It is important to understand that in modern models the main electronic module is often responsible for defrosting. If it is buggy, it may need to be re-flashed or replaced. In older models, this was done by a mechanical timer, which could be replaced relatively cheaply.
Diagnostic table: Symptoms and probable causes
To simplify troubleshooting, use the summary table. It will help you compare the behavior of your equipment with typical breakdowns.
| Symptom | Probable cause | Difficulty of repair | Necessary actions |
|---|---|---|---|
| Clicks, but does not starts | Start relay, compressor | Average | Replacement of the relay or diagnostics of the motor |
| Freezing slightly, long rest | Freon leak, blockage | High | Search for leaks, refill, replace filter |
| Does not turn off at all | Thermostat, leakage, wear | Medium/High | Replacing the thermostat or searching for leaks |
| Works jerkily (No Frost) | Defrosting system, fan | Medium | Checking the heating element, sensors, fan |
| On for 1 minute, off | Thermal relay, control board | High | Diagnostics of electronics and windings |
Analysis of symptoms allows you to weed out unnecessary options and focus on the main thing. However, remember that external signs do not always clearly indicate a specific part. For example, failure of the control board can simulate a sensor failure, sending incorrect signals to the actuators.
If you are not confident in your abilities, it is better to limit yourself to primary diagnostics. Incorrect assembly or leakage during repair attempts can turn a simple sensor replacement into a complex and expensive repair of the entire refrigeration system.
External factors and operating conditions
Before disassembling the equipment, it is worth excluding trivial causes. Sometimes the refrigerator does not freeze due to improper operating conditions. Check the tightness of the door: if the seal (elastic band) is worn out or dirty, warm air constantly enters, causing the compressor to work for wear.
The temperature in the room is also important. If the refrigerator is located near a radiator, stove, or in direct sun, the cooling system may not be able to cope with the heat flow. In winter, if the equipment is standing on an unheated balcony, the oil in the compressor may thicken, which will lead to a poor start.
☑️ Initial check before calling a technician
⚠️ Attention: Do not install a refrigerator close to the wall. For normal operation of the condenser (grid at the back), a gap of at least 5-10 cm is required for air circulation.
Another important point is the quality of the power supply. Voltage surges can damage electronics or cause engine instability. Using a voltage stabilizer can extend the life of your equipment, especially in the private sector or areas.
Frequently asked questions (FAQ)
Why does the refrigerator turn on for 10 seconds and turn off?
This is a classic sign of a faulty start relay or problems with the compressor (turn-to-turn short circuit). The motor tries to start, the current increases sharply, and the thermal protection relay opens the circuit to prevent a fire. Motor diagnostics and replacement of the start-up relay are required.
Is it possible to operate a refrigerator if it does not freeze well?
For a short time - yes, but it is risky. Products may deteriorate, and the compressor operates in extreme mode, which will quickly lead to its combustion. In addition, condensation can accumulate in the chambers, leading to corrosion. It is better to eliminate the cause.
How long should the refrigerator rest between starts?
In normal mode, the operating cycle is approximately: 15-20 minutes of work and 30-40 minutes of rest. The ratio of operating time to resting time should be approximately 1 to 2 or 1 to 3. If the refrigerator works more time than it rests, this is a sign of overload or leakage.
Why did the refrigerator start to freeze after defrosting, and then stopped again?
This indicates the presence of ice in a hard-to-reach place (for example, in No Frost air ducts) or a freon leak. Defrosting temporarily removes the ice plug, allowing the system to start working, but the reason (faulty defrost sensor or microcrack) does not go away.