Situation, when Nord refrigerator works without interruption, is familiar to many owners of this equipment. The compressor hums for days on end, trying to reach the set temperature levels, but never stops to rest. This is not just an annoying noise that prevents you from sleeping at night, but also a serious signal that there is a failure in the cooling system. If you ignore this symptom, the motor resource will quickly be exhausted, which will lead to an expensive replacement of the unit.
Constant operation of the engine causes overheating of internal components and a significant increase in electricity bills. In some cases, a “snow coat” may begin to form inside the chambers or, conversely, products stop freezing. Dual-chamber models often show different symptoms depending on where exactly the refrigerant circulation is disrupted. Understanding the nature of the problem is the first step to successfully restoring the device's functionality.
In this article we will analyze in detail the main reasons why Nord refrigerator does not turn off, and consider diagnostic methods. We will not use complex technical terms without explanation so that you can independently assess the scale of the disaster. Sometimes the problem is solved by simple adjustment, and sometimes the intervention of a technician with professional equipment is required.
Faults of the thermostat and temperature sensors
The most common reason for the continuous operation of the compressor is the failure of the thermostat. It is this element that is responsible for opening the motor power supply circuit when a certain temperature in the chamber is reached. If the contacts are stuck or the sensor is “lying”, indicating that it is still warm inside, compressor it will work endlessly. In older models Nord there are often mechanical regulators, the sensitive element of which loses elasticity over time.
In more modern electronically controlled models, air sensors are responsible for temperature control. Their readings are transmitted to the control module, which makes the decision to start or stop the engine. If the sensor is damaged or the contacts of its connector are oxidized, the system “thinks” that the temperature in the chamber is higher than normal. As a result, cooling cycle is not interrupted, and the refrigerator hums without stopping.
⚠️ Attention: Before replacing the thermostat, make sure that the capillary tube of the sensor is not pinched and fits tightly to the evaporator. Incorrect installation of a new part will lead to incorrect operation of even a working device.
To check the mechanical thermostat, you can temporarily close its contacts. If after this procedure the refrigerator turns off (provided that the temperature in the chamber is low), then the problem is in the regulator. Electronic sensors are checked with a multimeter to see if resistance changes with temperature changes. Replacing these elements yourself requires certain skills, since in mechanical models you will need to recharge the system with refrigerant if the sensor tube is built into the circuit.
Problems with the tightness of the circuit and freon leakage
If Nord refrigerator stops turning off, but at the same time it freezes slightly, there is a high probability of a refrigerant leak. Freon circulates in a closed circuit, taking heat from the chambers and releasing it into the environment through a condenser. When the amount of gas decreases due to microcracks in the tubes or corrosion, the efficiency of heat transfer decreases. The compressor tries to compensate for the lack of cold by working in increased mode, but it never reaches the desired temperature.
A leak can occur in various places: in the foamed part of the body, in the evaporator or in the heating circuit of the door perimeter. Often, owners do not even notice mechanical damage until the situation becomes critical. Signs of a lack of freon are also hot sides of the housing (or, conversely, cold if the gas is completely gone) and a lack of cold in the freezer when the engine is running
Is it possible to find a leak yourself?
It is almost impossible to independently find a microcrack in the foamed part of the housing without special equipment. A soap solution will only help if there is obvious damage to the visible pipes at the back of the refrigerator, but most often the leaks are hidden inside the thermal insulation.
It is important to understand that simply “adding freon” to a leaking system is a temporary solution that will not solve the problem. The gas will escape through the hole again, and the compressor will continue to wear out. Tightness systems are a key condition for normal operation. The technician must find the place of damage, solder it and only after evacuation of the system, fill in a new amount of refrigerant according to the technical data sheet of the model.
Wear of sealing rubber and violation of thermal insulation
Another common reason why Nord refrigerator turns off, there is a loose fit of the doors. Over time, the sealing rubber dries out, cracks or deforms, ceasing to perform its function. Through the resulting cracks, warm air from the room constantly penetrates into the chamber. Sensors record the increase in temperature and give the command to the compressor to turn on again and again.
You can check the tightness of the door in a simple way: hold a sheet of paper between the door and the body and try to pull it out. If the paper comes out easily without resistance around the entire perimeter, then the seal requires replacement or adjustment. It is also worth inspecting the rubber for dirt that may interfere with a tight seal.
- 🧼 Contamination: Sticky traces of food or grease prevent the door from closing tightly.
- 🔥 Deformation: Exposure to hot objects or direct sunlight could change the shape of the rubber.
- 🔩 Hinges: A skewed door due to weakened hinges creates a gap, even if the rubber is intact.
In addition to rubber, problems may be associated with the thermal insulation of the body itself. If condensation has formed inside the walls or polyurethane foam has lost its properties, the cold will go out and the heat will come in. In this case refrigerator it will work constantly, trying to cool not only the products, but also the structure itself. Restoring thermal insulation is a complex process, often requiring complete disassembly of the case.
Faults in the starting relay and compressor
When Nord refrigerator it hums but does not turn off, the reason may lie in the very “heart” of the unit - the compressor, or in its starting device. The starting relay is responsible for starting the engine and turning it off during overloads. If the relay contacts are stuck in the "on" position, the motor will run continuously, regardless of the thermostat readings. This is one of the simplest breakdowns that can be eliminated by replacing the part.
The compressor itself may also be faulty. When the piston group or valves reach the end of their service life, the engine loses its performance. It creates insufficient pressure in the system, due to which the freon circulates slowly and does not have time to cool the chambers to the required temperature. Outwardly, it looks like constant work: the engine hums, heats up, but does not cool down. In such cases, it is often necessary to replace the compressor with a new one.
| Symptom | Possible cause | Necessary actions |
|---|---|---|
| The motor hums, clicks and turns off | Faulty starting relay | Replacing the relay |
| The engine runs constantly, there is cold | Thermostat is faulty | Checking and replacing the thermostat |
| The motor is running, there is no cold | Freon leak or blockage | Call a technician to find a leak |
| Strong knocking inside the motor | Compressor wear | Replacement of the compressor |
Diagnostics of the compressor requires measuring the outlet pressure and current. If the current consumption is significantly lower than the rated one, and there is no pressure, the compressor “does not pump.” If the current is normal or increased, but there is no cold, a leak or blockage is likely. It is impossible to carry out these measurements independently without a pressure gauge station and clamps, so the help of a specialist is needed here.
Clogged capillary tube and circulation system
The refrigerant circulation system uses a capillary tube of a very small diameter. Through it, freon under high pressure enters the evaporator, where it expands and cools. If there is moisture or debris in the system, an ice blockage or clog may form. In this case, circulation the refrigerant is disrupted: the compressor works, trying to push gas, but the cooling capacity drops to zero.
Signs of a blockage are often: a running compressor, a hot condenser (only in the first part) and a cold or room temperature evaporator. Sometimes you can hear gurgling sounds that were not there before. In some cases, the blockage may be temporary (ice jam), and after defrosting the refrigerator for 24 hours, operation may be restored, but more often than not, purging of the system is required.
Removing the blockage is a complex procedure, including:
- 💨 Purge: High pressure nitrogen to remove debris.
- 💧 Replacement: Filter-drier, which retains moisture and contaminants.
- 🔄 Refilling: The system with a new amount of freon after vacuuming.
⚠️ Attention: Attempts to break through the blockage by increasing pressure or using chemical solvents at home can lead to rupture of pipes and complete failure of the refrigerator. Entrust this work to professionals.
The influence of external factors and improper operation
Before sounding the alarm and looking for a breakdown, it is worth eliminating external factors. Sometimes Nord refrigerator it does not turn off not because of a malfunction, but because of operating conditions. For example, if the equipment is installed next to heating devices, in direct sunlight or in a niche without gaps for ventilation, heat transfer is disrupted. The compressor simply cannot release the heat collected from the chambers.
It is also important to consider the temperature in the room. Most refrigerators are designed to operate in a certain climate class (usually from +10°C to +32°C or +43°C). If the room is too hot, the refrigerator will run longer to compensate for the heat gain. In winter, if the refrigerator is on an unheated balcony, the oil in the compressor may thicken, which will also lead to malfunctions.
☑️ Checking the operating conditions
Incorrect loading of cameras also affects operation. If you put a large amount of warm food in the refrigerator or left the door open for a long time, the compressor will work in increased mode until the temperature balance is restored. This is a normal reaction of the system, and not a breakdown. However, if the non-stop mode continues for more than 12 hours, it is worth looking deeper for the cause.
Specifics of models with the No Frost system
Owners Nord refrigerators with the system No Frost may encounter a special type of malfunction when the compressor does not turn off due to problems with defrosting. In such models, frost periodically builds up on the evaporator in the freezer, which must be removed by a heating element. If the defrost element, timer or defrost sensor fails, the evaporator becomes overgrown with a “fur coat”, which blocks the circulation of cold air.
As a result, it becomes warm in the main chamber, the temperature sensor requires cold, and the compressor works without stopping. In this case, the freezer may be colder than usual due to the proximity to the frozen evaporator, but the airflow (air flow) will be blocked by ice. A characteristic sign is the absence of periodic clicks and defrosting sounds, which are usually heard during normal operation.
For diagnostics, it is necessary to defrost the refrigerator completely (at least 24 hours) and check the resistance of the defrost heating element. If the heating element is burnt out, replacing it will solve the problem. If the heating element is working, the defrost sensors and the control module, which sends a command to turn on the heating, must be checked.
Frequently asked questions (FAQ)
How long can the Nord refrigerator work without stopping?
In normal mode, the refrigerator operates in cycles: it works for about 15-20 minutes and rests for 20-30 minutes. If the compressor runs for more than 12 hours without a break, it is considered a malfunction. Short-term continuous operation is possible when you first load warm products or after defrosting, but it should not last for days.
Is it possible to operate a refrigerator if it does not turn off?
For a short period of time, it is possible, but this will lead to rapid wear of the compressor and increased energy consumption. Long-term operation without stopping (several days) is guaranteed to lead to the motor burning out or the wiring melting. It is dangerous to operate equipment in this condition.
Why does the Nord refrigerator freeze, but does not turn off?
Most often this indicates a malfunction of the thermostat (it does not “see” that the cold has already reached) or a violation of the door seal. A small leak of freon is also possible when the compressor is still coping with maintaining the temperature, but is working at its limit.
How to understand that the thermostat has burned out?
If, when turning the thermostat knob to the “Off” position (or minimum value), the compressor does not stop, but continues to hum, most likely the thermostat contacts are stuck or it has completely gone out building. In electronic models, this may be indicated by an error on the display or a lack of response to changing settings.
Is it necessary to defrost the refrigerator if it does not turn off?
Yes, complete defrosting (for at least 24 hours with the doors open) is the first diagnostic step. It will help prevent the formation of an ice plug in the No Frost system or temporary blockage. If after defrosting and connecting to the network the problem remains, repair is required.