The situation when a two-chamber refrigerator suddenly stops working always takes you by surprise. The temperature inside the chambers begins to rise, food spoils, and puddles of melt water appear on the shelves. For the owner, this is not just discomfort, but also the risk of losing food supplies. The first thing you need to understand is the scale of the problem: is there a complete absence of cold or is it produced, but weakly.
Modern units, be it Indesit, Atlant or LG, are more complex than their predecessors with a single chamber. They may use different defrosting systems, such as No Frost or Low Frost, which affects the nature of the malfunction. If there is ice in the freezer, but it is warm in the refrigerator compartment, the problem may lie in the air exhaust system or a clogged capillary tube.
Before calling a technician, it is worth conducting an initial visual diagnosis. Often the reason is trivial: the plug came out of the socket, the circuit breaker in the control panel tripped, or the door remained ajar due to misalignment. If the equipment hums, but does not cool, or, conversely, is silent and does not make sounds, a deeper intervention will be required. Below we will analyze in detail the main components, the failure of which leads to a stop in cooling.
Faults of the compressor and start relay
The heart of any refrigeration unit is the compressor. It is this that ensures the circulation of refrigerant throughout the system. If you hear the motor trying to start, humming for a few seconds, then clicking and stopping, there is most likely a problem with the start relay or the motor windings. Some models, for example Bosch or Siemens, use an inverter compressor, which is quieter, but diagnosing its electronics is more difficult.
When the compressor overheats, it can be turned off by a thermal release. This often happens when the capacitor is worn out for a long time or when the capacitor behind the housing is dirty. Dust and animal hair create a “fur coat” that interferes with heat transfer, the motor runs continuously and burns out. It is important to regularly check the rear grille for dirt.
If the motor is completely silent, even when plugged in, it is worth checking the integrity of the power cord and the presence of voltage in the network. Sometimes the problem lies in the interturn short circuit of the windings, which requires replacing the entire assembly. Self-rewinding the motor at home is impossible and economically unfeasible.
Problems with the thermostat and sensors
The thermostat is responsible for maintaining the set temperature (thermostat) in mechanical models or an electronic control module with sensors in modern versions. If this element fails, the compressor may simply not receive a signal to start. In older models Atlant or Saratov the thermostat is a simple “tablet” with a capillary tube that can be easily changed.
In electronically controlled systems, such as Samsung with technology Digital Inverterthermal sensors are responsible for the temperature. There may be several of them: in the freezer, in the refrigerator compartment, on the evaporator. If one of them is “lying,” the unit can block the operation of the compressor to avoid emergency situations.
⚠️ Attention: When replacing the thermostat in mechanical refrigerators, it is important to correctly install and secure the capillary tube. If it does not fit tightly to the evaporator, the refrigerator will not work correctly, turning on too rarely or often.
Diagnostics of the sensors requires a multimeter. It is necessary to “ring” their resistance at different temperatures. If the device shows a break or resistance that does not correspond to the temperature, the sensor must be replaced. Electronic control modules can also suffer from failures in the firmware, which can be treated by flashing or replacing the board.
Freon leak and clogged capillary system
One of the most unpleasant reasons why a two-chamber refrigerator does not work is a refrigerant leak. Freon circulates in a closed circuit, and if a microcrack has formed somewhere, the gas gradually escapes. Symptoms can be different: mild cold, the compressor running without stopping, or a complete lack of cooling while the engine is running.
Clogged capillary tube is often caused by moisture getting into the system or oil breakdown products. An ice plug forms at the narrowing point, which blocks the freon flow. Visually, this can be seen by swelling of the evaporator or, conversely, by its excessive freezing in one place, while the rest of the tube remains warm.
Why can’t you just add freon?
If there is a leak in the system, a simple top-up will solve the problem only for a short time. After a week or month, the gas will go away again. In addition, air and moisture will enter the system, which will lead to corrosion and failure of the compressor.
To eliminate these faults, specialized equipment is required: a vacuum pump, a pressure gauge station, a burner and scales. The technician must find the leak, seal it, replace the filter drier, pump out the air and charge the system with a strictly defined amount of refrigerant.
Below is a table that helps differentiate the symptoms of a leak and a blockage:
| Symptom | Freon leak | System clogged |
|---|---|---|
| Compressor operation | Works constantly or with long pauses | Works with overload, may hum |
| Condenser temperature | Warm only at the beginning or cold | Hot to the point of blockage, then cold |
| Evaporator | Does not cool or partially | Freezes at the entrance, the rest is warm |
| Sound | Normal or gurgling (at the end) | There may be a whistle or noise of gas flow |
Failures in the No Frost defrosting system
If your two-chamber refrigerator is equipped with a system No Frost, the lack of cold is often associated with a malfunction of the defrost cycle. In such units, the evaporator is hidden behind a plastic panel. If the defrost heating element, thermal relay or timer (module) does not work, the evaporator becomes overgrown with ice, which blocks the cold air supply channels.
As a result, the fan drives air, but it does not pass through the evaporator radiator into the chamber. The refrigerator compartment stops cooling, although the freezer can still maintain the temperature for some time. Ice or “snow” may appear on the back wall inside the chamber.
☑️ Diagnostics of the No Frost system
For repairs, you need to dismantle the back panel in the freezer, defrost the ice (naturally or with a hairdryer, being careful) and check the defrost circuit. Often the heating element itself fails, which simply burns out, or the sensor, which does not “see” that the ice has melted and does not allow the system to switch to cooling mode.
⚠️ Attention: When defrosting ice with a hairdryer, do not overheat the plastic elements and do not direct a stream of hot air directly at the evaporator for more than 3-5 seconds at one point, so as not to damage the aluminum tubes.
Fan and air circulation malfunctions
In two-chamber models, especially with the system Frost Free, the fan is responsible for the distribution of cold. If it stops spinning, cold air remains in the freezer and the top compartment becomes warm. The reasons can be mechanical (freezing of the blades, ingress of a foreign object) or electrical (motor winding burnt out).
Sometimes the fan works, but makes a lot of noise or grinding noise. This indicates bearing wear. Over time, such a motor can completely jam. In some models Indesit or Ariston The fan is located in a niche where water can flow if the defrosting system is not working properly, causing a short circuit.
Checking the fan is simple: with the freezer door open (and the door sensor button pressed, if there is one), it should work. If the blades are standing still, but voltage is coming to the motor, a replacement is needed. It is also worth checking whether ice is preventing the free rotation of the impeller.
Mechanical damage and wear of seals
The reason does not always lie inside the hardware. Often the refrigerator does not maintain temperature due to a banal violation of the seal of the chamber. Over time, the rubber seal on the door becomes dull, cracks, or comes away from the body. Warm air enters through the resulting cracks, moisture condenses and freezes, and the compressor works hard, trying to compensate for heat loss.
You can check the tightness of the seal using a sheet of paper. Clamp the sheet with the door around the perimeter. If it is pulled out too easily or, conversely, is tightly clamped, the seal requires adjustment or replacement. It is also worth inspecting the door hinges: if they are skewed, tight closure cannot be achieved.
Mechanical damage to the housing, dents on the back wall (where the foamed capacitor is located) or punctures due to careless defrosting with a knife also lead to depressurization of the circuit. If the evaporator is punctured, freon comes out instantly, and repairs require calling a specialist.
Frequently asked questions (FAQ)
Is it possible to operate a refrigerator if it has stopped freezing?
Short-term operation in the “refrigerator only” mode (if the freezer is not working) is acceptable for defrosting or diagnostics. However, long-term operation with a faulty unit (for example, with a compressor running without stopping due to a leak) will lead to its complete combustion. It is better to turn off the device and call a technician.
How long should you wait after defrosting before turning it on?
If the refrigerator has been defrosting for more than 24 hours, it can be turned on immediately. If defrosting was short-term or carried out using a hairdryer, it is recommended to wait 2-4 hours for the oil in the compressor to drain into the crankcase and the temperature sensors to stabilize.
Why does the refrigerator work but does not turn off?
Continuous operation of the compressor indicates that it cannot reach the set temperature. Reasons: freon leak, compressor wear, blockage, poor door seal or thermostat malfunction. This is an emergency mode that threatens overheating.
How to understand that the compressor has burned out?
If the refrigerator is silent when turned on, the light is on, and the motor does not make any sounds even when the thermostat contacts are closed, the compressor or its windings have probably burned out. Also a sign may be a burning smell and a black coating in the engine area.
Is it possible to replace freon yourself?
Theoretically, it is possible if you have the equipment, but without vacuuming the system and replacing the filter-drier, such repairs are doomed to failure. Residual moisture in the system will quickly damage the new compressor. This is a job for a licensed professional.