The situation when a refrigerator Indesit with a system No Frost suddenly stops maintaining a low temperature always takes you by surprise. Products begin to deteriorate, and condensation appears on the shelves or, conversely, an ice crust appears where it should not be. Unlike classic models with a drip system, here air circulation is forced, and a failure in any node of this chain leads to loss of cold in the entire chamber.
The first thing the owner needs to do is not to panic and carry out an initial diagnosis. Often the problem lies not in a complex breakdown of the compressor, but in a simple violation of operating rules or failure of sensors. It is critically important to immediately check whether the emergency temperature indicator is on and whether the sound of a working fan is heard inside the freezer. If you heard silence instead of the usual hum, this is already half the answer.
Further actions depend on the symptoms: the freezer may work, but the refrigerator compartment may not, or the cold disappears completely. In systems No Frost the tightness and serviceability of the defrost system is critical. Below we will analyze in detail the mechanical and electrical causes of malfunctions so that you can understand the scale of the disaster and decide whether to call a technician or repair the device yourself.
Violation of operating rules and simple causes
Before disassembling the unit, exclude external factors. The refrigerator Indesit, like any equipment, is sensitive to environmental conditions. If the device is placed close to a wall or in a niche without gaps, heat transfer is disrupted. The compressor overheats and goes into protection mode, stopping pumping freon. Make sure that the gap to the wall is at least 5-7 centimeters.
Loading the chamber with warm products is a common mistake. The system No Frost is designed to maintain temperature, and not to quickly cool large volumes of food. Once inside the chamber, the hot pan sharply increases the humidity, which leads to freezing of the evaporator and blocking of the air channels. As a result, the cold simply does not reach the food.
⚠️ Attention: Never try to speed up defrosting with a knife or hairdryer. Damage to the evaporator tubes in the system No Frost will lead to an immediate release of freon and expensive repairs, which are often not economically feasible.
It is also worth checking the tightness of the door. The rubber seal dries out or becomes dirty over time. If warm air passes through the gap, the moisture inside the chamber condenses and freezes on the walls, forming a “fur coat.” This creates the illusion that the refrigerator is freezing too much, but in fact the temperature of the food is rising due to poor circulation.
Faults in the defrost system (Defrost)
The most common reason why Indesit No Frost does not freeze lies in the automatic system defrosting. Unlike older models, here the water from the condensate does not drip, but evaporates or is removed through drainage, and the ice is removed from the evaporator by the heating element. If this process is disrupted, the evaporator becomes overgrown with ice, the fan cannot drive air through the ice block, and the cold stops flowing into the chamber.
The key element here is Defrosting heating element. This is a tubular heater located directly on the evaporator. If it burns out, the ice will not melt during the defrost cycle. Over time, the ice mass blocks the fan. You can hear the fan trying to start, making a cracking noise, but no air flowing. In such cases, complete defrosting of the refrigerator (for 24 hours) and replacement of the heating element are required.
The second important component is defrost sensor (thermostat). It controls the temperature of the evaporator and gives a command to turn the heating element on and off. If the sensor is stuck in the “heating” position, the refrigerator will waste energy. If he does not see that the ice has melted, he may not allow the compressor to start, believing that the defrosting process is in progress.
☑️ Diagnostics of the defrost system
The third element of the circuit is timer or electronic control module. In older models Indesit there were mechanical timers that simply switched the “cooling” and “defrosting” modes. If the timer is stuck in defrost mode, the compressor will never start. In modern models, this function is performed by the board, but the principle remains the same: a failure in cycle management leads to freezing.
Problems with air circulation and fan
The heart of the system No Frost is the fan. It is he who drives cold air from the evaporator (which is usually hidden behind the back wall of the freezer) through all chambers through special channels. If the fan stops, the cold remains in the freezer compartment (and not everywhere), and in the refrigerator compartment the temperature quickly rises to room temperature.
The reasons for the fan stopping may be different. Most often this is a mechanical blockage with ice. As mentioned above, if the defrost system malfunctions, ice freezes on the blades, preventing them from rotating. In this case, you will hear a characteristic humming or cracking sound from the depths of the freezer. The ice must be carefully defrosted without using force.
The second reason is the failure of the fan electric motor itself. The winding may burn out or the shaft bearings may wear out. This is easy to check: with the freezer door open (and the door sensor pressed, if there is one), the fan should work. If the motor hums but does not turn, the shaft may be jammed. If there is silence, check the voltage at the terminals.
| Symptom | Probable cause | Check method |
|---|---|---|
| Noise/crackling in the freezer | Ice on the blades fan | Visual inspection after defrosting |
| Cold below, warm above | Fan does not work | Check rotation by hand (with power off) |
| Humming without cold | Air ducts are clogged with ice | Checking the air passage by hand at the holes |
| The fan is silent | The motor is burnt out or there is no power | Checking the winding with a multimeter |
How to safely check the fan?
Unplug the refrigerator! Remove the back panel in the freezer compartment. Find a fan. Try turning the blades with your finger - they should move easily. If it's tight, it needs lubrication or replacement. If it’s easy, connect the power and see if it spins. Do not stick your fingers into the working mechanism!
Freon leakage and compressor malfunctions
If the defrost system and fan are working, but no cold is generated, the problem may be in the refrigerant or compressor. Refrigerators Indesit often use freon R600a (isobutane), which is a fire hazard if leaked in large quantities, but simply evaporates in small doses. Leakage usually occurs through microcracks in the foamed part of the housing or in solder areas.
The main sign of a leak is that the compressor works constantly, without turning off, trying to gain temperature, but there is no cold or very little of it. In this case, the compressor itself may be hot, but the condenser (grid at the back) may be barely warm or cold. Normally, the grill should be uniformly warm or hot (depending on the model and mode).
Another problem is clogged capillary tube. Oil circulates in the system along with freon. Over time, the oil may thicken or accumulate breakdown products, blocking the narrow channel of the capillary. The symptoms are similar to a leak: the compressor is humming, there is no pressure, there is no cold. The difference is that the condenser can be hot only in the first part, and then cold.
⚠️ Attention: Self-filling with freon and searching for leaks requires special equipment (vacuum pump, pressure gauge station, leak detector). Without skills, you only risk ruining your equipment. If you suspect a leak, call a technician.
The most expensive option is a burned out compressor. If the motor hums, the start relay clicks and immediately turns off, or the compressor hums “pull-in” and does not start, the piston groups may have jammed or the winding has burned out. In modern refrigerators, replacing a compressor often costs almost half of a new device.
Failures in electronics and thermoregulation
Modern ones Indesit are stuffed with electronics. The temperature is controlled by thermal sensors (thermistors). Their resistance changes depending on temperature. If the sensor “lies” and shows the module that it is already -20°C in the chamber, although in fact it is +10°C, the compressor simply will not turn on. Usually in such cases, an error code lights up on the display (if there is one).
The starting relay is a small block on the compressor. It provides an impulse to start the engine. If the relay is faulty, the compressor will click and jerk, but will not start. This is a consumable item that can be changed easily and inexpensively. The malfunction can be determined by its appearance (melted body) or burning smell.
The main control module (board) may also fail, especially if there have been power surges. The tracks, relays or triacs that control the compressor and heating element burn out. Visually, blackened or swollen capacitors may be visible on the board. Repairing the board is possible, but requires the qualifications of a radio engineer.
Self-diagnosis algorithm
To avoid paying a technician for diagnostics, if the problem is simple, follow these steps. They will help localize the problem. Remember that safety comes first: carry out all manipulations inside the housing only with the device disconnected from the network.
- Assess the nature of the work: is the compressor humming? Is the fan working? Is there light inside?
- Check the temperature: is there cold only in the freezer or is it nowhere?
- Inspect the back wall of the freezer: is there ice, a snow coat?
- Listen to the sounds: relay clicks, fan crackling, constant humming.
If the compressor is silent, but the light is on, the problem is in the electronics, thermostat or start relay. If the compressor runs non-stop, but there is no cold, there is a leak, a blockage or a problem with the system No Frost. If there is ice on the back wall, defrost for 24 hours. If after defrosting everything worked, but after a week the cold disappeared again, change the defrosting system (heating element, sensor, timer).
Frequently asked questions (FAQ)
Why does the Indesit refrigerator freeze only in the top part of the freezer?
This is a classic sign of a system malfunction No Frost. Most likely, the fan is not pushing air down, or the air ducts are clogged with ice due to a defrost failure. It is also possible that the freon level is critically low, and it is only enough for the first circuit of the evaporator.
How long should defrosting last to remove the ice plug?
For complete melting of the ice in the hidden channels and on the refrigerator evaporator Indesit requires at least 24 hours. A shorter time (for example, 5-10 hours) can melt visible ice, but will leave ice jams deep in the system, which will lead to repeated breakdowns in a few days.
Is it possible to operate a refrigerator if it does not freeze, but works?
It is strictly not recommended. The compressor, running idle or trying to compensate for a leak, overheats. This can cause the motor winding or valve to burn out, turning a simple repair into replacing the entire unit. In addition, the food will spoil.
Where is the defrost button on Indesit No Frost?
In most models Indesit with the system No Frost there is no separate defrost button. This process occurs automatically according to a timer. If you need to defrost the refrigerator manually (for repair or cleaning), simply unplug it from the power supply for a day.