The situation when Nord refrigerator stops turning off and operates continuously and is critical for household appliances. A compressor that hums without interruption not only creates a constant background noise, but also consumes a huge amount of electricity, which is immediately reflected in the electricity bills. Moreover, long-term operation without rest breaks leads to overheating of the engine and its rapid failure, which may require an expensive replacement of the compressor.
Owners often notice that the unit begins to work more intensely after defrosting or setting a new temperature. However, ignoring the problem in the hope that the technology will “figure it out on its own” leads to disastrous results. It is important to understand that Nord this is a reliable technique, but it, like any mechanism, has its own resource and is subject to external influences. If you hear that the engine is humming for several hours, you need to urgently look for the cause.
In this article we will analyze in detail the main factors influencing continuous operation and provide an algorithm of actions for self-diagnosis. You will find out when you can cope on your own, and in which cases the intervention of a specialist is required. The most common reason is a violation of the tightness of the circuit or a refrigerant leak, which requires professional soldering and refilling. Do not rush to call repairmen until you have carried out an initial inspection.
Primary diagnostics and checking operating conditions
Before disassembling the equipment or calling for service, it is necessary to exclude trivial reasons associated with improper operation. Often, users themselves create conditions under which the refrigerator is forced to work at its limit. Check to see if the unit is too close to a wall or heat sources such as radiators or a stove. The distance to the back wall should be at least 5-7 cm for normal air circulation.
The second important point is the temperature in the room. If you install the refrigerator Nord on an unheated balcony or in a garage where the temperature drops below +10°C, the thermostat may not read the readings correctly. In such conditions, the oil in the compressor thickens and the refrigerant does not evaporate properly, which makes the system think that there is not enough cold.
- 🔍 Check the tightness of the door: the rubber should not be dirty or damaged.
- 🌡️ Make sure that the room is not hotter than +30°C, otherwise the equipment will work at wear and tear.
- 🚪 Do not leave the door open longer than necessary to load food.
⚠️ Attention: If you have just defrosted the refrigerator and turned it on, let it run idle for 2-3 hours. Loading with warm food immediately after defrosting causes the compressor to work without stopping until the set temperature is reached.
It is also worth paying attention to how tightly the door is closed. If the sealing rubber has worn out, lost its elasticity, or is simply contaminated with crumbs, warm air constantly enters the chamber. Sensors detect the temperature increase and give the command to the compressor not to turn off. Wipe the rubber band with a damp cloth and check for cracks or creases.
Malfunctions of the thermostat and temperature sensors
One of the most common technical reasons why the refrigerator does not turn offis the failure of the thermostat. This small device is responsible for controlling the temperature inside the chambers. If its contacts are “stuck” in the “on” position or it is completely out of order, the signal to stop the compressor simply does not arrive. In models Nord with mechanical control, the thermostat is often located inside the refrigerator compartment or under a plastic panel.
In more modern models with a system No Frost or electronic control, air sensors are responsible for the temperature. If such a sensor “lies” and shows that the chamber is warmer than it actually is, the electronics will keep the compressor on. Diagnostics of the electronic unit requires a multimeter and certain skills, since it is necessary to test the circuits for resistance.
How to check the thermostat with a multimeter?
To check the mechanical thermostat, it must be removed (after disconnecting the refrigerator from the network). Then the multimeter is switched to dialing mode. The probes are connected to the thermostat contacts. If at room temperature the circuit rings (there is resistance), and when the sensor is placed in the cold (for example, in the freezer for 10 minutes) the circuit opens, the thermostat is working. If it always rings or never rings, the part needs to be replaced.
Replacing the thermostat is a procedure that can be done with your own hands if you have basic skills in working with tools. It is important to choose an analogue with exactly the same characteristics, otherwise the temperature regime will be disrupted. When installing a new sensor, make sure that the capillary tube is not kinked or damaged.
Problems with tightness and freon leakage
If you notice that the refrigerator Nord is constantly humming, but at the same time the cold inside is becoming less and less, most likely there is a refrigerant leak. Freon circulates in a closed loop, and under normal conditions its quantity does not change for years. However, corrosion of the evaporator tubes, especially in the foamed part of the body, or mechanical damage during transportation can compromise the tightness.
If freon leaks, the pressure in the system drops. The compressor tries to compensate for the lack of refrigerant by operating longer, but cannot reach the set temperature. As a result, it works “extremely”, trying to cool the camera. This is the most dangerous operating mode, which quickly leads to the combustion of the motor-compressor due to overheating of the windings.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| The compressor is hot, there is no cold | Freon leak or capillary blockage | Call a technician to find the leak and refill |
| The motor runs, but does not heat up | Faulty starting relay | Replacing the start-protective relay |
| The refrigerator turns off after 1-2 minutes | Thermal protection is activated | Diagnostics of the compressor and electrical part |
| Noisy operation and vibration | Wear of bearings or shock absorbers | Replacing shock absorbers or repairing a compressor |
It is impossible to eliminate a freon leak on your own, since this requires special equipment: a vacuum pump, a pressure gauge station and a supply of refrigerant. In addition, it is necessary to find the location of the damage, which often requires opening the foamed part of the housing or replacing the evaporator. Attempts to simply “add gas” without eliminating the leak will only give a temporary effect.
Faults of the compressor and start relay
The refrigerator motor is its heart. If compressor worn out, it may lose its performance. The piston group wears out, the valves lose their tightness, and the motor ceases to create the necessary pressure in the system. In an attempt to compensate for the low efficiency, it begins to work continuously. This can be determined by the characteristic sound: instead of a smooth hum, a metallic knock or ringing may appear.
Often the reason for continuous operation is the starting relay. This small element is responsible for starting the engine and protecting against overloads. If the relay is stuck or its contacts are burnt, it may not open the power circuit even when the compressor has reached the desired temperature. In some cases, the relay, on the contrary, does not allow the motor to start, and you only hear clicks, but the opposite situation also happens - a constant supply of voltage.
- 🔊 Listen: a steady hum or an intermittent knock?
- 🔥 Touch the motor body: it should not be hot (more than 90°C).
- ⚡ Check the network voltage: surges can affect the operation of the electronics.
⚠️ Attention: If the compressor runs constantly and gets very hot, do not try to cool it with a fan or wet rags. Sudden temperature changes can lead to cracks or short circuits. Unplug the refrigerator and let it cool naturally.
Replacing a compressor is a complex and expensive procedure that requires a skilled technician. However, replacing the start relay is an operation that you can often do yourself. The relay is simply removed from the compressor pins (take a photo of its position first!) and replaced with a new one with similar markings.
☑️ Compressor diagnostics
The influence of fast freezing mode and electronics
Many models Nord are equipped with the “Super Freeze” function. This mode is designed to quickly freeze large quantities of fresh food. When activated, the compressor goes into continuous operation mode, ignoring the thermostat readings. The problem is that users often forget to disable this function, and the refrigerator works in high mode for days.
Check the control panel. If the snowflake indicator or “Super” sign is on, simply press the corresponding button to return the unit to normal operation. In models with electronic control, failures can occur due to power surges in the network, which leads to “glitches” of the control module. In this case, a full reset of the settings helps.
To perform a Hard Reset, disconnect the refrigerator from the electrical network for 15-20 minutes. This will allow the capacitors to discharge and the electronics to reboot. If after turning on the problem disappeared, then it was a software glitch. If after a few hours the situation repeats itself, the problem lies deeper.
When you need to call a technician: risk assessment
Independent repair is good as long as it is safe and appropriate. If you have checked the thermostat, made sure that the seal is intact and there is no fast freezing mode, but the refrigerator Nord still does not turn off, professional diagnostics are probably required. This is especially true in cases where work with refrigerant or disassembly of a sealed circuit is required.
The technician will be able to accurately determine the pressure in the system, check engine compression and identify hidden leaks using a leak detector. Specialists also have access to original spare parts, which are difficult to find in retail stores. Remember that incorrectly filling freon or using the wrong oil can completely finish off the equipment.
- 🛠️ Soldering of copper tubes and working with an open flame is required.
- ❄️ It is necessary to vacuum the system before filling with freon.
- ⚙️ You need a compressor replacement or complex electronic diagnostics.
It is important to weigh the cost of repairs and the price of a new refrigerator. If the equipment is more than 10-12 years old and the compressor has burned out, it is often more profitable to purchase a new unit than to restore the old one. However, for models Nordthat are famous for their maintainability, replacing the thermostat or relay often extends life by 5-7 years.
Why does the Nord refrigerator hum but not freeze?
This is a classic sign of a freon leak or a clogged capillary tube. The compressor runs idle, driving the remaining gas, but the cooling capacity is zero. You need to call a technician to find the leak and refill it.
Is it possible to operate the refrigerator if it does not turn off?
For a short time - yes, but no more than a few hours. Long-term operation without stopping will lead to overheating of the compressor windings, melting of the insulation and fire. In addition, electricity consumption will increase sharply.
How often should a working refrigerator turn off?
In normal operation, the cycle is approximately: 10-15 minutes of work and 20-30 minutes of rest. The ratio may vary depending on the load of products and the temperature in the room, but pauses in operation are required.
Does the amount of food affect the operating time?
Yes, a full refrigerator stays cold longer and is less likely to turn on. An empty refrigerator heats up faster from warm air entering when the door is opened, so the compressor will turn on more often.
What to do if the Nord does not turn off after defrosting?
Let it work for 3-4 hours without food. If during this time it does not reach the temperature and does not turn off, check whether the super freeze mode is turned on. If the mode is turned off, but there is no cold, there is likely a freon leak.