The situation when your refrigerator stops going into rest mode and works without interruption always causes alarm. The hum of the engine, which is usually interrupted by silence, now sounds monotonous and continuous, making you think that there is a failure in the system. Many owners of household appliances ignore this symptom until electricity bills arrive or food spoils.
The constant operation of the compressor is not just an annoyance, but a signal of a serious violation in the cooling cycle. Refrigerant circulates through the system in emergency mode, which can lead to overheating of components and their complete failure. It is important to understand that even modern models, such as Indesit or LG, are not designed to operate 24/7 without rest cycles.
If you notice that the equipment is running “weary,” you must immediately carry out diagnostics. In this article, we will look at the consequences of ignoring the problem, how to independently check the main components and in what cases the intervention of a specialist is required. Prolonged operation of the compressor without stopping for more than 24 hours often leads to irreversible jamming of the piston group.
Physical consequences of continuous operation of the compressor
Compressor - This is the heart of the refrigeration unit, and its continuous operation leads to a critical increase in temperature. In normal mode, the cycle includes periods of cooling and rest, during which the oil in the system has time to cool and return to the crankcase. In the absence of pauses compressor oil begins to lose its lubricating properties, turning into a viscous mass or, conversely, liquefying to the state of water, which leads to friction of metal parts.
Overheating of the electric motor windings is another inevitable problem. The insulation of the wires is designed to withstand certain temperature loads, and at constant voltage it begins to melt. This may cause a short circuit inside the motor. In the best case, the thermal protection relay will work and the refrigerator will simply stop turning on. At worst, a fire or complete breakdown of the windings will occur, requiring replacement of the entire unit.
⚠️ Attention: If you smell burning or see that the rear grill of the refrigerator is red-hot, immediately unplug the appliance! Further operation in this mode can lead to a fire.
In addition, the heat removal system also suffers. The capacitor located on the rear wall does not have time to cool, which disrupts the phase transition freon from gaseous to liquid state. The pressure in the system increases, creating excess stress on the pipes and connections. This often causes depressurization of the circuit and refrigerant leakage.
Risks to food and economic damage
Paradoxically, a refrigerator that does not turn off may not freeze food properly. Due to a violation of the cyclical operation evaporator it may become covered with an ice crust (“fur coat”), which blocks heat exchange. As a result, the temperature in the main chamber can remain higher than normal, which leads to food spoilage, bacterial growth and the appearance of an unpleasant odor.
The economic aspect also cannot be ignored. Electricity consumption during continuous operation increases by 3-4 times compared to normal mode. If an ordinary refrigerator consumes about 1-2 kW per day, then a faulty unit can “wind up” 5-8 kW. Over the course of a month, this will result in a significant overpayment of bills, which may exceed the cost of preventive repairs.
List of risks for the contents of the refrigerator:
- 🧊 Freezing food at the back wall, leading to destruction of the tissue structure (especially meat and fish).
- 🦠 Reproduction of pathogenic microflora in areas where the temperature is not low enough due to impaired air circulation.
- 💧 Leakage of melt water onto the floor if the condensate drainage system cannot cope with the volume of moisture generated.
Owners of equipment with the system No Frost should be especially careful. Constant operation of the fan and defrost heater (if it is included in the cycle) can lead to melting of the plastic elements of the inner chamber. Repairing such damage often requires replacing the entire inner box, which is not economically feasible.
Main reasons: from simple settings to breakdowns
Before you panic, it’s worth checking the obvious things. Often the reason lies in improper operation. For example, if you have just loaded a large amount of warm food into the chamber, the refrigerator will work hard for several hours, trying to restore the temperature. This is normal, but if the load is not removed, the mode will not change.
One of the common reasons is a loose fit sealing rubber to the body. If the door does not close tightly, warm air constantly enters. Sensors detect the temperature increase and command the compressor to operate continuously. Check the rubber for cracks, dirt or deformation.
Technical faults causing the problem:
- ❄️ Malfunction of the thermostat or temperature sensor, which is “stuck” in the “on” position.
- 💨 Freon leak, due to which the compressor drives air, but cannot gain the required pressure to shut down.
- 🔌 Problems with the control module, which does not send a signal to stop the engine.
It is also worth mentioning that the capillary tube is clogged. If a plug of oil or moisture occurs in the refrigerant circulation system, the discharge pressure increases, but no cooling occurs. The compressor works at the limit of its capabilities, trying to push through this plug, but never reaches the target temperature.
Influence of the environment
The location of the refrigerator next to the radiator, in direct sunlight or in a niche without ventilation makes it work more intensely. Make sure that there is a gap of at least 5-7 cm around the case for normal air circulation.
Diagnostics: table of symptoms and solutions
To accurately determine the problem, it is useful to compare the observed symptoms with possible causes. Below is a table that will help you navigate the nature of the malfunction. Remember that self-diagnosis has limits, and complex cases require professional equipment.
| Symptom | Probable cause | Difficulty of repair | Actions |
|---|---|---|---|
| The compressor is hot, humming, but no cold | Freon leak or blockage | High | Call a technician to find the leak |
| The refrigerator freezes, but does not turn off | Faulty thermostat/sensor | Average | Replacing the temperature sensor |
| The sound of the compressor running is heard, but it is silent | Start relay or windings | Average | Checking the motor electrics |
| Ice freezing in the chamber | Problem with defrosting (No Frost) | Average | Checking the heating element and timer |
When diagnosing, it is important to pay attention to the nature of the noise. If knocking, whistling or gurgling is added to the usual hum, this indicates mechanical damage or cavitation in the system. Electronic control module It may also malfunction, especially if there have been power surges in the network.
In some cases, the problem is solved by simple defrosting. If the system No Frost drainage is clogged or the corrugation has come off, the air does not circulate correctly. Complete defrosting for 24 hours (with doors open) can remove ice jams and restore operation.
⚠️ Attention: Do not attempt to open the sealed circuit yourself or change the compressor without special tools. This requires evacuation of the system and precise charging with freon, which is impossible to do at home.
☑️ Initial fault check
Algorithm of actions when a problem is detected
If you realize that the refrigerator does not turn off, you need to act consistently. First, rule out external factors: check if the door is open, if the room is too hot, if the temperature is set correctly. The optimal mode for the main chamber is +3...+5 °C, for the freezer - -18 °C.
Next, carry out a visual inspection. Feel the seal around the perimeter, clamp a sheet of paper in different places of the door - it should be pulled out with force. Inspect the condenser grille from behind: it should be warm evenly. If only part of the tubes is hot and the rest is cold, this is a sign of a leak or blockage.
Step-by-step action plan:
- Defreeze the refrigerator completely (at least 24 hours).
- Turn on the appliance empty and note the time until the first shutdown.
- If a shutdown does not occur within 2-3 hours of operation at the minimum temperature, call a technician.
- Do not load the chamber with products until the reasons are determined.
It is important not to ignore the first signs. Working to the point of wear and tear reduces the service life of equipment significantly. Modern inverter compressors, which are found in models Samsung or LG, are sensitive to overheating and can burn out much faster than older models.
When you need to call a specialist
There are a number of situations when independent actions are useless or dangerous. If, after defrosting and checking the settings, the refrigerator continues to work without interruption, then the problem is within the system. A technician will be needed to diagnose the pressure in the circuit, check the integrity of the motor windings and analyze the operation of the electronics.
It is especially critical to contact a professional if you suspect a freon leak. Refrigerants in modern refrigerators are often flammable or require special disposal conditions. In addition, to search for micro-leaks, you need a leak detector, and for repairs, welding in a nitrogen environment.
The cost of repairs will depend on the unit that has failed. Replacing the thermostat is relatively inexpensive and quick. But replacing a compressor or re-welding the circuit is an expensive procedure that can amount to up to 70% of the cost of a new refrigerator. In such cases, it is sometimes more rational to consider purchasing new equipment.
Can the refrigerator not turn off due to a broken fan?
Yes, in the systems No Frost the fan ensures the circulation of cold air. If it is broken or frozen, the cold does not enter the chamber, the temperature sensor does not detect cooling and commands the compressor to continue working. This is a common reason for “endless” operation.
Is it normal for the refrigerator to hum for 20 minutes in a row?
Yes, this is normal. The operating time of the compressor depends on the load of the chambers, the room temperature and the set mode. The work cycle can range from 15 minutes to 1 hour. You should sound the alarm if the refrigerator does not turn off for several hours in a row.
Does an old cable or socket affect continuous operation?
Indirectly - yes. If the network voltage drops due to poor contact, the compressor may not reach the required speed to create pressure, but continue to consume current and heat up. However, more often the reason lies in the equipment itself, and not in the wiring.
What to do if the refrigerator is old and repairs are more expensive than a new one?
If the resource of the equipment is exhausted and the cost of restoration is high, it is dangerous to operate an emergency device. Older models are less energy efficient and may cause a fire. In this case, it is wiser to recycle the old unit and purchase a new one with a high energy consumption class.