The situation when compressor the refrigeration unit works without interruption, and the temperature inside the chamber remains at room temperature, is a classic sign of a serious malfunction. You can hear the usual hum of the motor, feel the vibration of the body, but the food begins to quickly deteriorate. This indicates that the cooling cycle is broken and the refrigerant does not perform its function of collecting heat.
Modern models, be it Indesit, Bosch or LG, are equipped with protection systems that often block the start of the compressor in the event of critical failures. However, in the case of the described problem, the motor often runs “idle”, trying to achieve the specified parameters, which leads to excessive energy consumption and equipment wear. You need to act quickly to prevent the final failure of the equipment.
In this material we will analyze the main reasons why refrigerator it stopped freezing, despite the continuous operation of the engine. We will look at both simple operating errors that you can fix yourself, and complex technical breakdowns that require the intervention of specialists. Understanding the nature of the malfunction will help you save time and money.
Checking the operating mode and temperature in the chamber
Before suspecting a breakdown compressor or a freon leak, it is necessary to eliminate a banal error in the settings. Often, users accidentally switch the controller to the “Super Freeze” mode or set the minimum temperature, forcing the equipment to work for wear. In this mode, motor will not turn off, since the electronics or thermostat “think” that it is necessary to cool the chamber to extreme values.
Check the position of the thermostat. If you have a mechanical control, the knob should not be at maximum (usually the numbers 6 or 7, or the inscription Max). Electronic control requires checking the digital indicators on the display. Incorrect calibration of sensors can also give false readings, causing the cooling system to work continuously.
⚠️ Attention: If you have changed the settings to average values, but the compressor continues to work without stopping for more than 2-3 hours, and the temperature does not drop, then the problem is not in the adjustment, but in a technical malfunction of the components.
It is also worth paying attention to the density fit doors. If the rubber seal is worn out, dirty or deformed, warm air constantly enters the chamber. The temperature sensor detects the heating and gives the command refrigeration unit to work more intensely. As a result, you hear a constant hum, but the cold does not accumulate due to heat inflows.
Faults in the defrost system and ice freezing
One of the most common reasons why refrigerator it hums, but does not freeze, is a violation of the defrosting cycle. In models with a system No Frost or Frost Free an ice “coat” gradually builds up on the evaporator hidden behind the rear wall. If the defrost system does not turn on, the ice blocks the circulation of cold air, and the fan may even jam.
In this case, the compressor works continuously, trying to cool the sensor, which is located in the air environment of the chamber, and not inside the ice monolith. You may notice that the back wall in the refrigerator compartment is covered with frost or, conversely, has become warm, and a lump of snow has formed in the freezer. This is a sure sign that evaporator is clogged with ice.
Diagnostics often require complete defrosting of the equipment within 24 hours. If after this the refrigerator began to freeze normally, but after 1-2 weeks the problem recurred, it means that one of the elements of the defrosting system has failed: TEN, defrost thermostat or the timer. Independent replacement of these parts requires disassembling the housing and checking the multim circuit
☑️ Diagnostics of the defrost system
Refrigerant leak and problems with the compressor
If compressor works constantly, but the condenser (grid at the back) remains only partially cold or warm, most likely there is a leak in the system freon. A refrigerant is a working fluid that transfers heat. Without a sufficient amount of gas, the compressor simply circulates the void without creating the necessary pressure for cooling.
Leaks can occur in places where tubes are soldered, in the evaporator (especially if it was damaged when defrosting with a knife) or in shut-off valves. It is impossible to detect a leak by ear, since freon has no odor. Requires the use of a leak detector or soap solution to look for bubbles at the joints. Restoring tightness and refilling with freon is a task exclusively for licensed craftsmen.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Compressor is hot, grille is cold | Freon leak or blockage | Call a technician to find a leak |
| Humming and clicking, no start | Faulty start relay | Replacing the compressor relay |
| Strong vibration and noise | Wear of the motor or shock absorbers | Diagnostics of the motor suspension |
| The engine is running, there is no cold anywhere | Complete absence of freon | Filling and evacuating the system |
In addition to the leak, the problem may lie in the compressoritself. If it has reached the end of its service life or there is an interturn short circuit in the windings, it may hum, but not develop the required compression. In such cases, the motor often overheats greatly, and the thermal protection relay is triggered, followed by a click and restart. This condition is dangerous due to fire and requires immediate disconnection of the device from the network.
Clogged capillary tube and filter drier
Another technical reason why refrigerator does not freeze when the engine is running is capillary tube clogged. There is a narrow section in the freon circulation system where the refrigerant changes from liquid to gaseous. If there is moisture, oxidation products or debris in the system, an ice or dirt plug forms in this place.
When clogged the compressor begins to work with increased load, trying to push the refrigerant through the obstacle. You may notice that the condenser grid heats up unevenly: the part is hot, and after the blockage it is cold. Often in the area of the filter drier or capillary you can hear a characteristic gurgling or hissing sound.
Removing the blockage requires professional equipment. The master must:
1. Evacuate the system.
2. Purge the circuit with nitrogen under high pressure.
3. Replace filter-drieras the old one will no longer be able to perform its function.
4. Fill the system with new freon in strict accordance with the weight indicated on the nameplate.
⚠️ Attention: Attempts to clean the capillary tube yourself without a vacuum pump and a pressure gauge station will only lead to a temporary effect or complete failure of the system.
Failure of electronics and sensors
In modern models with electronic control (for example, Samsung, LG), control moduleis responsible for the operation of the compressor. If the control board malfunctions or burns out, it can send a continuous signal to start the engine, ignoring the readings of the temperature sensors. A failure in the controller software is also possible.
Temperature sensors (thermistors) may produce incorrect data. If the sensor “thinks” that the chamber is +20°C, it will keep the compressor on. Checking the resistance of the sensors is carried out with a multimeter at different temperatures. Replacing a burnt-out sensor usually solves the problem of constant humming.
Is it possible to drive a faulty refrigerator?
Transporting a refrigerator with a faulty compressor or a freon leak is possible, but requires compliance with strict rules. After transportation, be sure to let the equipment stand upright for at least 4-6 hours before turning it on, so that the oil flows into the compressor crankcase.
Sometimes the problem lies in starting relay. This is a small part that fits onto the compressor contacts. If it is stuck in the on position, current will flow to the windings constantly. You can check this by carefully removing the relay and shaking it: if you hear the ringing of a broken ceramic element inside, the part must be replaced.
Operation rules for extending service life
To avoid situations when fridge works on wear and tear, it is important to follow the operating instructions. Do not place hot foods in the chamber, as this sharply increases the load on the refrigerator compressor and disrupts the temperature regime. Also, do not load the chamber tightly with products, leave space for air circulation. and violates the temperature regime. Also, do not load the chamber tightly with food, leave space for air circulation.
Check the condition of seals doors regularly. Wipe them with a soft cloth and soapy water. If the rubber has become hard or cracked, it must be replaced, otherwise the cold will disappear, forcing the engine to work without interruption. The cleanliness of the condenser grille at the back is also important: a layer of dust several millimeters thick impairs heat transfer.
Maintaining the temperature regime in the room where the equipment is located is also critical. Most models are not designed to operate at temperatures below +5°C or above +35°C. In such conditions refrigerant can behave unpredictably, and the oil in the compressor may thicken or boil away.
When it is necessary to call a specialist
If simple diagnostic methods (defrosting, checking settings) did not help, and refrigerator continues to work without stopping, without producing cold, professional help is needed. This is especially true if you suspect a freon leak or compressor failure. Independent repair of these components without experience and tools is impossible.
The technician will be able to accurately diagnose the problem using specialized equipment. It will determine the pressure in the system, check the current consumption motor and identify hidden defects. Remember that calling a specialist in a timely manner is often cheaper than replacing a compressor that has burned out due to overload or buying a new refrigerator.
Why does the refrigerator hum, but does not freeze after defrosting?
If after complete defrosting (24 hours) the refrigerator turned on, worked for a couple of hours and stopped freezing again, continuing to hum, this is almost guaranteed to indicate a malfunction of the defrost system (the heating element or timer burned out) or the presence of a freon leak that was masked by ice.
Is it possible to use a refrigerator if it does not freeze, but works?
You cannot use such a refrigerator for storing food, as this will lead to spoilage and poisoning. In addition, continuous operation of the compressor without rest cycles will lead to its overheating and eventual combustion, which will significantly increase the cost of repairs.
How much does it cost to repair if the refrigerator stops freezing?
The cost depends on the breakdown. Replacing the thermostat or start relay is inexpensive. Freon refilling and leak detection are more expensive. Replacing a compressor is the most expensive part of the repair, often amounting to up to 50% of the cost of a new device.