The situation when your the refrigerator works longer than it restsis one of the most common symptoms signaling violations in the thermoregulation system or the tightness of the circuit. During normal operation, the compressor must turn on and off at regular intervals, creating what is known as a duty cycle. If you notice that the unit is humming almost without interruption or the pauses between starts have become critically short, this requires the immediate attention of the owner.
Ignoring this sign can lead to serious consequences, including overheating of the motor and spoilage of food. Modern inverter models can operate in constant mode for temperature maintenance, but even they have their own load limits. Understanding the physiology of the process and the ability to distinguish between normal and pathological conditions will help you save on expensive repairs or replacement of equipment.
Before you panic, you need to analyze the operating conditions and external factors that could affect the operation of the unit. Often the reason lies not in a breakdown of the electronics, but in a banal violation of heat exchange or incorrect installation. Let's look at the main scenarios why the equipment goes into continuous operation mode.
⚠️ Attention: If you notice that the rear radiator grill is hot to the point of burning, and the inside of the chamber is warm, immediately disconnect the device from the network to avoid fire of the wiring or compressor.
The influence of external temperature and installation on operation compressor
One of the main reasons why the refrigerator works longer than it restsis the high ambient temperature. Heat exchange occurs more efficiently, the greater the temperature difference between the refrigerant in the condenser and the air in the room. If you install the unit next to a heating radiator, stove, or in direct sunlight, the system has nowhere to give off heat.
Under such conditions, the compressor is forced to work at the limit of its capabilities to compensate for the constant flow of heat from the outside. Temperature sensors detect that the specified parameters have not been reached inside the chamber and do not give a command to turn off the motor. This leads to increased energy consumption and accelerated wear of components.
- 🌡️ Location of equipment in a niche without gaps for ventilation on the back and sides.
- ☀️ Direct sunlight on the body through the window.
- 🔥 Proximity to heat sources: ovens cabinets, radiators, dishwashers.
In addition, it is worth checking whether the tightness of the door seal is broken. If the rubber d seal wears out, becomes dirty or deformed, warm air constantly enters the chamber. The compressor attempts to cool this incoming air, resulting in a continuous cycle of operation.
⚠️ Attention: Do not attempt to cool hot foods by putting them directly into the refrigerator. This creates an instant thermal load, forcing the motor to work in increased mode.
Malfunctions of the thermoregulation system and sensors
If external conditions are normal, the problem may lie in the “brains” of the refrigerator. The thermostat is a device that is responsible for turning the compressor on and off depending on the temperature in the chamber. If it fails or its contacts are “stuck,” the signal to turn off the motor is simply not received, and the refrigerator operates without stopping.
In models with electronic control (No Frost, Smart Cooling), temperature sensors (thermistors) are responsible for this process. They may transmit incorrect data to the nano module. For example, a sensor may “report” that the freezer is +5°C, although in fact it is already -10°C. The control module, receiving false data, continues to keep the compressor on.
Diagnosis of such faults requires special instruments, such as a multimeter, to check the resistance of the sensors. However, there are indirect signs indicating a problem with thermoregulation:
- ❄️ Products in the main chamber freeze, although the mode is set to the average value.
- 🔊 The compressor does not turn off even if there is no food inside at all.
- 💡 Indicators on the control panel may flash or show an error (fault code).
Replacing the thermostat in mechanical models is a relatively simple procedure and is often performed by craftsmen at home. In electronic systems, it may be necessary to reflash the control module or completely replace it if the control chip is burned out.
How to check a mechanical thermostat?
To check a mechanical thermostat, you need to remove it and immerse the sensitive tube in cold water with ice. If the contacts do not click after a few minutes, the device is faulty. However, it is safer to entrust this procedure to a specialist.
Problems with refrigerant: freon leak
Paradoxically, if there is a refrigerant (freon) leak, the refrigerator can also work longer than it rests, or even continuously. When the amount of gas in the circuit decreases, system performance decreases. The refrigerator simply cannot reach the required temperature during the standard operating time.
As a result, the thermostat does not open the circuit, and the compressor hums, trying to compensate for the lack of refrigerant. Visually, this can manifest itself in poor cooling or its absence, despite the constant operation of the motor. Often, when freon leaks, the compressor gets very hot, trying to idle.
The main places where depressurization most often occurs:
| Leak location | Probability | Symptoms |
|---|---|---|
| Evaporator (inside the chamber) | High | Bloating of the wall, traces of oil, smell |
| Pipes behind the refrigerator | Medium | Mechanical damage, corrosion |
| Condenser (rear grille) | Low | Visible fistulas, rust |
To eliminate a leak, you need to call a technician with equipment to find the place of damage, solder and fill the system with new gas. It is impossible to perform this operation yourself without a vacuum pump and a pressure gauge station.
Freezing of the defrost system (for No Frost models)
In refrigerators with the system No Frost continuous operation of the compressor is often associated with freezing of the evaporator. In such models, a fan and evaporator hidden behind a plastic panel are responsible for heat removal. If the defrosting system (heating element, timer or defrost sensor) fails, a coat of ice builds up on the evaporator.
Ice blocks the circulation of cold air, and the sensors stop reading the real temperature in the chamber. The compressor receives a signal that there is not enough cold and continues to work. At the same time, it may be warm in the chamber itself, since air simply cannot pass through the ice block.
Signs of a malfunction of the defrost system:
- 🧊 You can hear the cracking or noise of ice behind the back wall of the chamber.
- 💨 There is little or no blowing from the vents completely.
- 🌡️ The temperature in different corners of the chamber is very different.
The solution to the problem is to defrost the refrigerator during the day (with the doors open) and then replace the burnt heating element or defrost sensor. Ignoring this problem may result in the compressor burning out due to overheating.
⚠️ Attention: Do not try to clear ice from the evaporator with a knife or sharp objects. Damage to the evaporator tubes will lead to an immediate leak of freon and expensive repairs.
☑️ Diagnosis of a cooling problem
Wear of the compressor and start relay
The most serious and expensive reason to eliminate is mechanical wear of the compressor itself. Over time, the piston group wears out, compression drops, and the engine is physically unable to create the necessary pressure in the system. It works constantly, but does not produce cold.
The starting relay, the device responsible for starting the engine, also often fails. If the relay “sticks” in the on state, the compressor windings are constantly energized, which leads to overheating and humming. In some cases, the relay may click, trying to start the engine, but will not turn off.
Symptoms of compressor wear:
- The motor is very hot to the touch (you cannot touch it with your hand).
- There is a characteristic metallic knock or hum.
- Electricity consumption has increased sharply.
In modern inverter refrigerators diagnosis is more difficult, since they are controlled electronically. Here the cause may be not only the compressor itself, but also the inverter board, which supplies incorrect currents to the motor windings.
Frequently asked questions about the continuous operation of the refrigerator
Can a refrigerator work without interruption in the heat?
Yes, in the summer, when the room temperature is above +30°C, refrigerators can work almost without interruptions or with very short pauses. This is considered normal for most models, as long as the set temperature is maintained inside. However, if the temperature in the chamber rises and the motor does not turn off, this is a breakdown.
How long should the refrigerator rest between starts?
In normal mode, the operating cycle is approximately: 15-20 minutes of operation and 20-30 minutes of rest. The ratio may vary depending on the product load and ambient temperature. A short cycle (works for 2 minutes, rests for 10) is also harmful to the motor.
Is it dangerous if the refrigerator hums all night?
If this happens once after loading a large amount of warm food, this is normal. But if the situation repeats regularly, this indicates a malfunction. Long-term operation without stopping leads to overheating of the windings and can cause a fire or failure of the compressor.
Why does a new refrigerator work constantly?
When turned on for the first time, a new refrigerator takes time (up to 2-3 hours) to reach operating mode and freeze the chambers. During this period, the compressor can operate without interruption. If after 4-5 hours of operation it does not turn off and does not freeze, this is a manufacturing defect or damage during transportation.
Do you need to turn off the refrigerator if it does not turn off on its own?
Yes, if you are convinced that the temperature inside does not drop, and the motor runs for more than 6-8 hours in a row, the device must be de-energized. Long-term operation in this mode is dangerous. It is better to keep the refrigerator turned off until the technician arrives.