The situation when the refrigerator does not turn offis a critical signal for the owner of household appliances. Unlike short-term failures, continuous operation of the compressor indicates that the system cannot reach the set temperature parameters or that there is a failure in the control circuit. Ignoring this symptom often leads to serious financial losses associated with replacing expensive components or completely disposing of the unit.
The continuous operating cycle disrupts the natural rhythms of cooling and defrosting established by the manufacturer. This creates excess pressure in the system, overheating the motor and can cause a wiring fire. Understanding the physics of the process helps to react in time and prevent a catastrophe in the kitchen.
In this material we will analyze in detail what processes occur inside the chamber when automation fails, and why inverter compressors they behave differently than classic models. It is important not to panic, but to consistently analyze the condition of the device in order to make the right decision on further actions.
Thermal shock and compressor wear
The main consequence of continuous operation is extreme wear compressor. This unit is designed for cyclic load: the operating period is replaced by a rest period, during which the temperature of the motor windings decreases. If there is no rest cycle, the oil in the crankcase begins to lose its lubricating properties due to overheating, which leads to dry friction of the parts.
As a result of constant stress, the metal elements expand, the gaps decrease, and so-called “jamming” occurs. At this moment, the motor hums, but the shaft does not turn, which often leads to burnout of the windings or failure of the starting relay. Restoration after such damage is usually impossible; a complete replacement of the unit is required.
⚠️ Attention: If you smell a strong burning smell or see that the compressor housing is red-hot, immediately unplug the cord from the outlet. Further work may lead to a short circuit and fire.
In addition to mechanical wear, the electrical part also suffers. Direct current creates a high load on the relay and thermostat contacts. They can simply weld together, which is why the circuit will not open even with a working temperature sensor. In such cases, replacing the compressor alone will not help; a revision of the entire electrical circuit will be required.
Violation of the defrost cycle and ice shell
Modern systems No Frost and static cooling require periodic stopping of the compressor to carry out the defrost cycle. If the refrigerator does not turn off, the evaporator does not have time to warm up, and moisture from the air continues to crystallize on its surface. Over time, a dense ice shell forms, which acts as a heat insulator.
The presence of ice between the evaporator and the air in the chamber blocks heat exchange. The compressor tries to compensate for the lack of cold by working even harder, which creates a vicious circle. As a result, the temperature inside the chamber may not be low enough, and the unit itself will work against wear and tear, trying to cool the layer of ice, and not the products.
- ❄️ Ice blocks the ventilation holes, disrupting air circulation.
- ❄️ Temperature sensors embedded in the ice mass transmit incorrect data.
- ❄️ Water from melting ice (during rare outages) can flow into electrical components.
This phenomenon is especially dangerous for systems with drip defrosting of the rear wall. If the compressor does not allow the wall to heat above zero, the condensate does not flow into the drain, but freezes at the bottom of the chamber, forming a snowdrift. This can lead to deformation of plastic elements and damage to door seals.
The myth about “hardening” the compressor
There is a misconception that old Soviet refrigerators could work for days without harm. This is not true: their life simply ran out faster, and thermostats often had large hysteresis (temperature spread), allowing the unit to cool down longer. Modern freons and compressors require strict adherence to cycles.
Product spoilage and violation of sanitary standards
Paradoxically, but when the refrigerator does not turn off, the products inside can deteriorate. Due to the evaporator icing described above, cold ceases to effectively flow into the chamber volume. The temperature in the main compartment can rise to +10...+15°C, which is an ideal environment for the growth of bacteria.
In the freezer the situation is also critical. Continuous operation does not guarantee deep freezing if the system is clogged with ice or has a freon leak. Meat and fish lose their structure, become flabby, and when re-frozen (poor quality) they become covered with large ice crystals that destroy the tissues of the product.
| Product type | Risk at +10°C | Visual sign of spoilage |
|---|---|---|
| Dairy products | High (souring in 4-6 hours) | Blistering of packaging, delamination |
| Meat and poultry | Critical (reproduction of pathogens) | Sticky surface, change odor |
| Vegetables and fruits | Medium (rotting) | Darkening, softening of tissues |
Particular attention should be paid to medicines and cosmetics, which are often stored in the door. If the temperature regime is violated, they lose their properties. If the refrigerator hums for days, but does not freeze, it is better to move the contents to another place or put them in ice until the technician arrives.
Energy shock and load on the network
The economic aspect of the problem also cannot be ignored. The compressor is the most energy-intensive component in a domestic refrigerator. In normal mode, it consumes energy approximately 30-40% of the time (operation factor). If the unit does not turn off, electricity consumption increases by 2.5–3 times, which is immediately reflected in utility bills.
A constant load also falls on the home electrical network. Old wiring, outlets or extension cords may not be able to withstand high current flow for long periods of time. The contacts in the socket begin to heat up, the plastic melts, which creates the risk of a short circuit outside the refrigerator itself.
⚠️ Attention: Do not use cheap Chinese extension cords or tees to connect the refrigerator. During continuous operation, they become a weak link and can melt, causing a fire.
In addition, power surges in the network, which often occur during peak hours, are perceived more acutely by the equipment when the compressor is running. The protective mechanisms may not have time to work, and the current surge will finish off the already overheated engine. A voltage stabilizer in such a situation is a wise investment to protect equipment.
Diagnostics: why does the compressor not stop?
Before sounding the alarm, you need to understand the nature of the malfunction. Most often, the reason lies in one of three elements: a leak, an electronics failure, or external factors. Self-diagnosis will help the technician quickly find a breakdown over the phone or understand whether it is worth calling a specialist.
The first thing to do is check the tightness sealing rubber along the perimeter of the door. If the rubber has dried out, there is a crack in the door or it is skewed, warm air constantly enters the chamber. The temperature sensor detects heating and does not give a command to turn off, causing the motor to idle.
- 🔍 Check whether the thermostat rod is stuck (in mechanical models).
- 🔍 Inspect the condenser (grid at the back) for dust and dirt.
- 🔍 Make sure that the refrigerator is not standing close to the wall or radiator.
In models with electronic control, the cause may be a failure of the temperature sensor (thermistor). If it “lies” and shows that the chamber is +10°C, when it is already -5°C, the control module will drive the compressor to the bitter end. There may also be a failure in the control module itself, which does not physically open the relay contacts.
☑️ Initial check of the refrigerator
Comparison of the consequences for different types of compressors
The reaction of the refrigerator to continuous operation strongly depends on the type of engine installed. Classic ones piston compressors are noisier and more sensitive to overheating; they more often fail during long-term operation without a break. Their service life under such conditions is reduced by 60-70%.
Inverter models behave differently. They do not turn off completely in normal mode, but only reduce the speed to maintain the temperature. Therefore, for them the concept of “not switched off” is blurry. However, if the inverter refrigerator hums at full speed for days and does not freeze, this is a sign of a serious freon leak or problems with the inverter board.
Linear compressors used in some models LG i Electroluxalso have their own characteristics. They work on the principle of reciprocating piston movements without rotation. Their weak point is the valve mechanism, which can become deformed when overheated, which will lead to a complete stop of cooling.
Algorithm of actions when a malfunction is detected
If you notice that the refrigerator is working without interruption, you need to act quickly, but without panic. The first step is to completely defrost the unit. Even if you have a No Frostsystem, leave the refrigerator turned off for 12-24 hours with the doors open. This will remove ice plugs and allow the compressor to cool completely.
After defrosting, turn on the device and monitor its cycle. If it reached temperature and turned off, the problem was icing. If it starts working non-stop again, you need to call a technician. It is strictly not recommended to climb inside the system yourself, especially if soldering or refilling with freon is required.
⚠️ Attention: Do not try to forcefully turn off and on the refrigerator every 15 minutes to “cool” the motor. Frequent starts create inrush currents that will finish off the compressor faster than continuous operation.
It is also important to check the operating conditions. Perhaps you put a hot pan in the chamber or left the door open for several hours while you washed the floor. In this case, the refrigerator was simply doing its job, trying to compensate for the heat. If external factors are excluded, and the motor is humming, this is a technical malfunction.
Remember that a timely call to the service center often allows you to get away with replacing the thermostat or clearing a blockage in the capillary tube. Delay turns minor repairs into replacement of a compressor or the entire refrigerator.
How much does a repair cost?
The cost of repairs depends on the model. Replacing the thermostat is inexpensive and quick. Repairing freon leaks and refilling are average in price. Replacing the compressor is the most expensive option, often accounting for 50-70% of the cost of a new refrigerator.
Is it possible to leave a refrigerator on overnight if it does not turn off?
Leaving such a refrigerator unattended overnight is dangerous. Within 8 hours of continuous operation, overheating can become critical, which will lead to a fire or permanent breakdown of the motor. It is better to turn it off from the network before the technician arrives.
Why doesn’t the new refrigerator turn off on the first day?
This is normal. After the first loading and connection, the unit requires time (from 6 to 24 hours) to cool the entire volume of chambers and products to the set temperature. During this period, it can work without interruption.
Does the summer heat affect the frequency of shutdowns?
Yes, in hot weather (+30°C and above) the refrigerator works more intensely. Rest periods are reduced, but complete cycles without shutdown should still occur. If they are not there even at night, when the room is cooler, this is a breakdown.
What to do if the refrigerator is humming, but there is no cold?
Most likely, there is a refrigerant leak or a capillary tube is clogged. The compressor runs idle, trying to pump the empty system. Professional diagnostics and refilling with freon is required.