The situation when food freezes in the freezer, but the main compartment is at room temperature, is a classic sign of a technical malfunction of the dual-circuit cooling system. The owner of a refrigeration unit is faced with melted meat and spoiled vegetables, although the compressor may continue to hum, creating the illusion of normal operation of the equipment. This is a common problem, which often indicates a violation of the refrigerant circulation or a malfunction of the control electronics.
It is important to understand that modern models, be it Indesit, Atlant or Beko, are designed on the principle where the cold is generated in one place and distributed among the chambers. If this balance is disturbed, diagnosis must begin immediately. Ignoring the first symptoms can lead to failure of an expensive compressor, the repair of which is not economically feasible.
The first thing to do is to assess the scale of the problem: is the compressor working at all, are there any extraneous sounds, and how long ago has the cold disappeared? Self-diagnosis at this stage it helps to save time on calling a technician or, in simple cases, solve the problem without involving specialists. However, it is worth remembering that deep repairs require professional skills.
The principle of operation of the No Frost and static cooling system
To understand the cause of the breakdown, you need to know how the cold gets into the main chamber. In systems No Frost the evaporator is hidden behind a plastic panel, and air circulation is carried out by a fan. If the fan stops or the ducts become clogged, cold air stops flowing into the refrigerator compartment, remaining in the freezer.
In units with static cooling (drip system), the refrigerant passes through the tubes, cooling the back wall. Here the problem often lies in a violation of the tightness of the circuit or blockage of the capillary tube. The temperature difference between the chambers in such models is regulated by thermostats or electronic sensors.
⚠️ Attention: An attempt to defrost the refrigerator using shock methods (hair dryer, hot water) in the presence of ice in the channels can lead to deformation of the plastic elements of the evaporator and the final breakdown of the condensate drainage system.
Electronic control installed in models Samsung or LG, regulates the operation of the dampers that allow access to cold air. If the damper is stuck in the closed position, the refrigerator compartment will become warm even though the freezer compartment is working properly. Mechanical thermostats in simpler models simply close the compressor circuit when a certain temperature is reached.
Why does the freezer continue to work?
The freezer often has priority in the operation of the compressor or its own cooling circuit. The system primarily strives to maintain a low temperature where frozen foods are stored, ignoring the increase in temperature in the upper compartment to a certain limit.
Refrigerant leak: symptoms and localization
One of the most common reasons why the refrigerator does not freezeis a banal freon leak. The refrigerant gas circulates in a closed loop, and if a microcrack appears in the tube, the pressure drops. The compressor continues to work, trying to catch up with the temperature, but physically cannot create cold due to a lack of working substance.
Often a leak occurs in the foamed part of the case or in the area of the door heating circuit. It's difficult to notice visually. An indirect sign may be swelling of the rear wall inside the refrigerator compartment or the appearance of oily spots under the unit, although in modern models the oil often remains inside the system.
- ❄️ The compressor works almost without interruption, trying to compensate for the loss of cold.
- ❄️ The condenser grille at the back remains cold or barely warm, although it should warm up.
- ❄️ The temperature in the freezer is maintained, but the food begins to thaw over time.
- ❄️ The appearance of a hissing or gurgling sound inside the housing when the motor is running.
To accurately determine the location of the leak, technicians use leak detectors and ultraviolet markers. Finding a fistula on your own is almost impossible without specialized equipment. If a leak is confirmed, you will need not only refilling with freon, but also installing a new evaporator or sealing the tubes.
Clogged capillary tube and compressor operation
There is a narrow section in the refrigerant circulation system - the capillary tube. This is where the sharp drop in pressure and temperature occurs. If moisture or oil oxidation products enter the system, an ice or dirt plug will form. The refrigerant stops circulating, and the cold does not reach the evaporator of the refrigeration chamber.
The compressor in this situation is overloaded. It hums, heats up, but cannot push through the plug. You can often notice that the motor is hot to the touch, and the tubes coming out of it have different temperatures: one is hot, the other is at room temperature, whereas normally they should heat up evenly.
| Symptom | Normal condition | When clogged |
|---|---|---|
| Condenser temperature | Evenly warm/hot | Hot only at the compressor outlet |
| Operation sound | Even humming | Humming with pauses or overheating |
| Frost on the evaporator | Uniform layer | Absent or only at the inlet |
| Pressure in the system | Working | Reduced or vacuum |
Blowing the capillary tube with nitrogen under high pressure is a standard repair procedure. If the blockage is caused by moisture, the system will have to be vacuumed for a long time and the filter drier must be changed. In difficult cases, a complete replacement of the circuit is required, which is a labor-intensive process.
Malfunction of the control module and sensors
In modern refrigerators Bosch, Whirlpool and other brands, an electronic module is responsible for the distribution of cold. It reads readings from temperature sensors and gives a command to open the air damper or turn on the fan. If electronic module fails, it may “think” that it is already cold in the refrigeration chamber and not supply air there.
The sensors themselves (thermistors) often fail. They change their resistance with age or due to power surges. The module receives incorrect data and does not start the cooling cycle for the upper chamber. In some models, an error code appears on the display indicating a specific faulty sensor.
Diagnostics of the module requires testing the circuits with a multimeter and checking the output signals. Sometimes the problem is solved by flashing or replacing the control board. In older models with mechanical control, the role of the controller is played by a thermostat, which can also stick or lose calibration.
⚠️ Attention: Power surges in the network are the main cause of failure of electronic modules. Use stabilizers or surge protectors, especially in the private sector or old houses.
Problems with the fan and defrost system
For systems No Frost the fan is the heart of the circulation. If its blades are iced up or the motor is burned out, cold air remains in the freezer. You may hear the compressor humming, but silence in the fan area will indicate a problem. Sometimes the fan jams due to frozen ice.
The defrost system (heating element, timer, defrost sensor) also plays a key role. If the heating element burns out, the evaporator becomes overgrown with a “fur coat” that blocks the air supply channels. The fan starts idling or stops due to ice. As a result, the refrigerator compartment is warm, but the freezer, where the evaporator is located, may be too cold or, conversely, warm due to lack of circulation.
- 🔊 The fan makes a grinding noise or hums louder than usual - a sign of worn bearings.
- 🔊 The fan blades rotate with difficulty due to ice.
- 🔊 There is no sound from the fan when the door switch is open (in some models).
- 🔊 A thick layer of ice is visible on the back wall of the freezer.
Checking the defrosting heating element is carried out using a continuity tester. If the spiral is intact, the defrost sensor and timer are checked. In models with electronics, the control module itself may be responsible for defrosting, and then the diagnosis is limited to checking its output signals.
☑️ Fan diagnostics
Mechanical damage and wear of seals
The problem does not always lie deep in the unit. Sometimes sealing rubber band the refrigerator door becomes dry or dirty. Warm air constantly enters the chamber through a loose fit. The compressor cannot cope with cooling such a volume, and the temperature in the compartment rises, while the freezer, the door of which is opened less often, keeps the cold.
It is also worth checking the door hinges. If they are weakened, the door warps, and even a whole rubber band does not provide a tight seal. Visually this may not be noticeable, but checking with a sheet of paper (the clamped sheet should be pulled out with force along the entire perimeter) will immediately show problem areas.
Mechanical damage to the housing, dents or rust can damage the thermal insulation. If the refrigerator is placed close to a wall or furniture, the ventilation of the condenser is disrupted, which also affects the cooling efficiency. It is necessary to observe the technological clearances specified in the instructions for the model Indesit or any other.
What to do: step-by-step instructions
If If you find that your refrigerator isn't freezing, don't panic. Be consistent. First, rule out simple reasons: check if the door is tightly closed, if the ventilation duct inside the chamber is not clogged with food, if the light is working (power indicator). If the compressor is silent, there may be a problem with the thermostat or start relay.
Defrost the refrigerator completely. Leave it turned off for 10-12 hours (preferably a day) with the doors open. This will help if the problem was a “snow coat” on the evaporator or micro-clogging of the system with moisture. After defrosting, turn on the unit and let it work for 2-3 hours without loading food.
Sequence of actions:1. Disconnect from the network.
2. Defrost min. 10 hours.
3. Check the seals for cleanliness.
4. Turn on empty for 3 hours.
5. Measure the temperature with a thermometer.
If after defrosting the situation repeats itself a few days or hours later, it means there is a technical problem (leakage, blockage, compressor failure). In this case, independent repair without tools and knowledge is impossible and dangerous. You need to call a specialist with equipment for vacuuming and refilling the system.
Why did the refrigerator start working after defrosting, but after a week it stopped again?
This is a classic sign of a freon leak or an incipient blockage. During defrosting, the ice in the capillary melts and the system temporarily begins to work. But as soon as the moisture freezes again or the freon completely escapes through a microcrack, the cold disappears. Repair is required.
Is it possible to operate the refrigerator if the upper chamber does not freeze?
For a short time - yes, if you transfer the food to the freezer or other places. But long-term operation in this mode is harmful to the compressor, which works without rest, trying to achieve the impossible. This will lead to its overheating and eventual combustion of the windings.
How much does a repair cost if refilling with freon is needed?
The cost consists of the work of the technician, the cost of the refrigerant and consumables (filter, solder). The price depends on the region and model of the refrigerator. Usually this is a medium-cost intervention, only replacing the thermostat or start relay is cheaper.
Does the compressor hum when there is a freon leak?
Yes, the compressor continues to hum and tries to pump. However, due to the low pressure in the system, it can work under less load or, conversely, overheat, since the gas it compresses also serves to cool its body. The absence of characteristic vibration of the tubes may indicate a lack of gas.