The situation when the refrigerator Indesit stops cooling the upper chamber, while the freezer compartment continues to function normally, is one of the most common complaints from the owners of this equipment. This temperature asymmetry often takes you by surprise, because the food in the main compartment begins to deteriorate, but at first glance the compressor is working properly. Understanding that the problem lies not in a complete failure of the system, but in a violation of the circulation of the refrigerant or failures in defrosting, helps to quickly determine the direction of troubleshooting.
In most cases, the reason lies in the fact that the cold air simply does not reach the upper shelves or its flow is blocked by an ice plug. This can happen both in models with the system No Frost, and in classic two-chamber units with a drip defrosting system. It is important not to panic and sequentially check several key components that are responsible for the distribution of cold inside the housing.
Before calling a technician, it is worth conducting an initial diagnosis, which will allow you to weed out simple problems, such as incorrect setting of the temperature regime or simple freezing of the evaporator. Ignoring the first signs can lead to more serious damage, including failure of the compressor, so you need to respond promptly.
⚠️ Attention: If you notice that a “coat” of ice has formed on the back wall of the upper chamber, and the food has become warm, immediately defrost the refrigerator completely (at least 24 hours) before starting any technical diagnostics.
The principle of operation of the cooling system in two-chamber models
To understand why the refrigerator Indesit is warm at the top but cold at the bottom, you need to understand the basic physics of the process. In classic models with one compressor and one refrigeration circuit, freon first passes through the evaporator located in the freezer. It is there that the main cold is created, part of which is then directed to the refrigeration compartment through special channels or due to natural convection.
If the freezer is working normally, this means that the compressor is working, there is freon in the system (at least partially), and the gas compression-expansion cycle occurs. The problem is localized precisely in the area of transition of cold from the lower to the upper zone. In models with No Frost a fan is responsible for this process, which drives air through the air ducts. In drip systems, cold air falls from top to bottom or is supplied through a damper.
An imbalance can be caused by many factors: from a sticking mechanical damper to software failures of the electronic control module. It is also worth considering that over time, door seals lose elasticity, and warm, moist air enters the upper chamber, which the cooling system simply does not have time to cool, working at its maximum capacity.
Problems with No Frost defrosting system
The most likely reason that the refrigerator Indesit does not freeze in the upper compartment when the freezer is running is a malfunction of the automatic defrosting system. In units No Frost moisture from the air settles on the evaporator in the form of frost. Periodically, this ice must be melted by a heating element (heating element) so as not to block the air channels.
If one of the components of this circuit fails, the ice accumulates and eventually blocks the path of cold air to the upper chamber. This may not be visible visually, since the evaporator is often hidden behind a plastic panel on the back wall of the freezer. As a result, the fan continues to hum, but the air simply does not pass through the ice plug.
- ❄️ Malfunction of the evaporator heating element: the heating element burns out and stops melting the ice, which leads to fouling of the heat exchanger.
- 🔌 Failure of the defrost sensor: the thermostat does not give a command to turn on the heating or, conversely, does not turns it off on time, disrupting the work cycle.
- 🌀 Fan failure: the motor that circulates the air may freeze in the ice crust or fail electrically, stopping circulation.
Diagnostics These elements require testing with a multimeter. It often happens that it is not the heating element itself that burns out, but the defrosting system, which is in series in the circuit. Replacing it is cheaper and easier than replacing the entire heater. However, if the problem lies in the control module, which does not supply voltage to the defrost circuit, a more complex re-soldering or board replacement will be required. fuse defrost system, which is in series in the circuit. Replacing it is cheaper and easier than replacing the entire heater. However, if the problem lies in the control module, which does not supply voltage to the defrost circuit, a more complex re-soldering or replacement of the board will be required.
Clogged capillary tube or freon leak
A more serious technical problem that causes the described symptoms is a violation of the refrigerant circulation. If a microscopic blockage has formed in the system (for example, with oxidation products or moisture) in the capillary tube, freon cannot fully circulate throughout the entire circuit. In such cases, a situation is often observed when the freezer still somehow freezes due to residual pressure or local accumulation of refrigerant, and the cold simply does not reach the upper chamber.
Freon leakage also manifests itself with similar symptoms in the initial stages. The gas gradually escapes through microcracks, and its quantity is only sufficient to cool the first section of the circuit (freezer). Over time, the situation will worsen: the freezer will stop gaining temperature, and the compressor will work non-stop, trying to compensate for the lack of cooling capacity.
Signs of problems with the circuit often include:
- 🔥 Hot condenser: the grill at the back or the side walls of the refrigerator gets hotter than usual or, conversely, remains cold.
- 🔊 Compressor noise: the unit hums continuously, trying to achieve the set parameters, but does not turn off.
- 💧 Oily stains: oil is often visible at the leak site, which circulates along with freon in the system.
⚠️ Attention: Independent repair of the freon circulation system is impossible without special equipment (vacuum pump, pressure gauge station). Attempts to simply “add gas” without looking for a leak will lead to repeated breakdown in a short time.
Faulty thermostat and damper
In some models Indesit, especially in older series or in refrigerators with mechanical controls, a thermostat or mechanical control is responsible for supplying cold to the upper chamber damper If the thermostat fails and is “stuck” in the “off” position, the compressor may not start at all, or, in two-compressor models, the refrigeration chamber circuit will not turn on.
In modern models with electronic control (Full No Frost), an electromagnetic damper (damper) is responsible for the distribution of flows. It opens and closes according to a signal from the temperature sensor in the refrigerator compartment. If the damper is stuck in the closed position due to ice or a broken drive, cold air cannot physically enter the upper compartment.
Checking the thermostat in mechanical models is simple: you need to close the contacts with wires. If the refrigerator starts to freeze after this, the thermostat needs to be replaced. In the case of electronics, diagnostics are more complicated and often require checking the resistance of the sensors. Incorrect readings of the upper chamber temperature sensor can “deceive” the control module, which will assume that there is already cold there and will not open the damper.
How to check the temperature sensor?
To check the sensor (thermistor), you need a multimeter in resistance measurement mode. At room temperature (about 20-25°C), a working sensor usually shows a resistance in the range of 2-5 kOhm (the exact value depends on the model). When placing the sensor in the freezer, the resistance should increase. If the device shows a break or zero, the sensor is faulty.
Diagnostic table of main symptoms
To simplify troubleshooting, you can use the following table, which connects the observed symptoms with the most likely causes. This will help narrow down your search before calling a specialist.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The freezer is freezing, the top is warm, the sound of the fan is heard | Clogged air channels with ice (defrost problem) | Medium (replacement of the heating element/sensor) |
| The compressor runs non-stop, the condenser is hot | Freon leak or capillary tube clogged | High (refilling required) |
| There is an ice crust on the back wall in the upper chamber | The thermostat or defrost sensor is faulty | Low/Medium |
| The refrigerator is silent, does not turn on | The compressor is burned out or starting relay | High (compressor replacement) |
Analysis of the behavior of the unit in different modes allows you to more accurately determine the unit that requires attention. For example, if after complete defrosting the refrigerator begins to freeze perfectly in both the upper and lower chambers, but after 1-2 weeks the problem returns, then with a 90% probability the defrosting system is to blame defrost system.
Algorithm for self-checking and actions
If you decide to try to fix the problem yourself, start with the simplest and a safe method - complete defrosting. This action is free and in some cases (especially in case of temporary failures or small ice jams) can completely restore the functionality of the equipment Indesit.
The process must be thorough: it is not enough to simply turn off the refrigerator at night. It takes at least 24 hours, or better yet two days, for ice in hard-to-reach areas of air ducts to completely thaw. The doors must be open, and melt water must be collected under the unit.
☑️ Checklist for complete defrosting
After turning on the empty refrigerator, let it run for 2-3 hours. If the temperature in the upper chamber began to drop and reached normal values (+3...+5°C), then the problem was an ice plug. However, if after a week the symptoms recur, you will have to disassemble the back panel of the freezer and check the system elements No Frost with a multimeter.
When you need to call a specialist
Despite the possibility of self-diagnosis, there are situations when professional intervention is inevitable. First of all, this applies to any manipulations with the refrigeration circuit. If you find traces of oil, hear the hissing of gas or are sure of a freon leak, self-repair is not only useless, but also dangerous.
Also, the help of a specialist is needed if, after replacing the defrost heating element or thermostat, the problem does not disappear. This may indicate a malfunction of the electronic control module, which requires re-soldering or complex flashing. Inept handling of electronics can lead to a short circuit and complete failure of the unit.
It is worth considering that original spare parts for Indesit (especially for older models) may be in short supply, and the technician will be able to select a high-quality analogue that will suit the geometric and electrical parameters. The use of unsuitable components can lead to rapid re-failure of the equipment.
Why, after defrosting, did the refrigerator stop freezing again after a week?
This is a classic sign of a malfunction of the defrosting system. Ice accumulated again and blocked the channels. Most likely, the evaporator heating element, defrost sensor or timer burned out. The faulty element needs to be replaced.
Is it possible to operate the refrigerator if the upper chamber does not freeze?
For a short time - yes, but the food in the upper compartment will spoil. Long-term operation is harmful to the compressor, which will wear out trying to cover the entire volume. In addition, an ice plug can damage the fan.
How much does it cost to repair the No Frost system in Indesit?
The cost consists of the price of spare parts (heating element, sensor, timer) and the work of the technician. Replacing the heating element is usually cheaper than finding a freon leak. The exact price can only be found out after on-site diagnostics.
How often do you need to defrost a No Frost refrigerator?
Technically, the No Frost system does not require defrosting. However, manufacturers recommend doing this preventively 1-2 times a year for hygiene and checking the condition of the seals. If you have to defrost more often, the equipment is faulty.