The situation when freezer compartment regularly turns water into ice, and in the refrigerator compartment the products begin to deteriorate, causes confusion among most owners of household appliances. It seems paradoxical that half of the unit works perfectly, and the second is completely out of order. However, for modern systems No Frost and classic drip models, this is a fairly common breakdown scenario, which often indicates a violation of the refrigerant circulation or a failure in the control system.
Before calling a technician, it is important to understand the basic principle of operation: the cold is generated in the freezer, and in the upper compartment it falls by force or by gravity. If this cold transfer process is disrupted, you get a working bottom and a warm top. In 80% of cases, the problem lies not in the absence of freon, but in a clogged capillary tube or a malfunction of the defrost sensor.
In this article we will analyze in detail the mechanical and electronic causes of the failure, we will explain how to carry out initial diagnostics with your own hands and in what In cases, independent repairs can lead to permanent breakdown of the compressor.
Tightness failure and refrigerant leak
One of the most insidious reasons why the refrigerator has stopped freezing in the upper compartment is a partial leak of freon. In contrast to a complete loss of gas, when the compressor is humming, but there is no cold anywhere, when there is a leak of 30-40% of the refrigerant, there is still enough of it to create a low temperature in the freezer where the evaporator is installed. However, the pressure is no longer enough to “push” the cold agent further along the circuit into the fridge compartment.
In such cases, you may notice that the compressor works almost without interruption, trying to reach the set temperature. The back wall inside may be covered with an uneven layer of frost or, conversely, remain warm at the top edge. If your refrigerator has been in operation for more than 7-10 years, the likelihood of microcracks in the foamed circuit or corrosion of the evaporator tubes increases significantly.
⚠️ Attention: If you hear hissing during defrosting or smell a specific chemical odor, immediately unplug the appliance and ensure the room is ventilated. Although modern refrigerants are often safe, their leakage in a confined space is unacceptable.
To accurately diagnose a leak, professional equipment is required - a leak detector that reacts to freon vapors. It is almost impossible to visually detect a leak in the foamed part of the case without opening the thermal insulation, which is a complex repair procedure.
Malfunction of the defrost system (for No Frost)
In systems No Frost the most common culprit of the described problem is a failure in the evaporator defrost cycle. Over time, a coat of ice builds up on the radiator located behind the rear panel of the freezer. If the defrost system does not work, ice completely blocks the air channels, and cold air physically cannot enter the refrigerator compartment.
Three key elements are responsible for the defrosting process: Defrost heating element, defrost sensor (thermostat) and timer (or electronic control module). If the heating element burns out, the ice does not melt. If the sensor “sticks”, it does not give a command to turn on the heating or, conversely, does not turn it off in time. As a result, the fan either stops due to ice or drives warm air.
Symptoms of such a breakdown are:
- ❄️ Heavy icing of the back wall in the freezer.
- 🔇 No characteristic crackling or clicking when trying to start defrosting.
- 💨 Weak air flow from the holes between the chambers.
How to check the heating element defrost with a multimeter?
To check, you need to remove the back panel in the freezer, find the heating element (usually a curved tube under the evaporator) and test it with the probes of the multimeter in resistance measurement mode. If the device shows “1” or “OL” (open), the heating element is faulty and requires replacement. Normal resistance ranges from 200 to 400 Ohms.
It is important to note that in some models of refrigerators Indesit or Ariston there is a specific disease - blown defrost fuse, which is located in the heating element circuit. Replacing it often solves the problem without costly repair of the main module.
Clogged capillary tube or filter drier
Mechanical blockage in the refrigerant circulation system is the second most common cause after defrosting problems. An ice or oil plug may form in a narrow capillary tube or filter drier, as well as clogging with corrosion or oil oxidation products. This prevents the normal flow of freon.
If there is partial blockage, the pressure at the outlet of the compressor increases, and at the inlet to the evaporator drops. As a result, the freezer, where the beginning of the evaporator is located, still cools, but the refrigerant simply does not reach the middle and end of the circuit (refrigerator compartment) in the required volume. This is often accompanied by the fact that the condenser grille at the back of the refrigerator only partially heats up (by 30-50%).
To eliminate this malfunction, the technician needs to:
- Drain the remaining refrigerant.
- Replace the filter-drier (this is a mandatory procedure for any opening circuit).
- Purge the system with nitrogen under high pressure to remove contaminants.
- Evacuate the system and fill with new freon.
It is impossible to remove the blockage independently without a vacuum pump and a pressure gauge station. Attempts to “blow out” the system with your mouth or an air cylinder will only lead to moisture getting inside the circuit, which will completely disable the equipment due to the formation of acids in the compressor oil.
Problems with the fan and air dampers
If you have a two-chamber refrigerator, especially with a system No Frost, The serviceability of the fan is critical. It is he who forcibly pumps cold air from the freezer into the upper compartment. If the fan impeller is covered with ice, jammed, or its motor is burned out, circulation stops. The cold remains below, and the upper chamber is heated by the food.
Also in modern models (for example, LG, Samsung, Bosch) special air dampers are installed (damper). These are mechanical or electrical valves that regulate the volume of air supplied. If the damper is stuck in the closed position or its electric drive is broken, the cold flow is blocked at the entrance to the refrigeration chamber.
You can check the operation of the fan visually (if there is access) or by ear. When the refrigerator door is opened, the fan should often stop (the door switch is activated), and when closed, it should start. If you do not hear the noise of the motor or the whistling of air, the problem may be in this unit.
Frequent causes of fan failure:
- 🧊 Freezing of the rotation axis due to poor sealing of the chamber.
- ⚡ Burning of the motor winding from a surge voltage.
- 🔧 Mechanical damage to the blades due to inaccurate defrosting with a knife.
☑️ Diagnostics of the ventilation system
Failure of electronics and sensors temperature
A modern refrigerator is a complex computer where temperature is controlled thermal sensors. In a typical configuration, there can be from two to five pieces: in the freezer, in the refrigerator compartment, on the evaporator, in the freshness zone. If the sensor in the refrigeration chamber “lies” and shows the control module that it is already -5°C, although in fact it is +15°C, the compressor will not turn on for cooling, considering the task completed.
It is also possible that there is a failure in the electronic control module. Oxidation of contacts, power surges in the network or manufacturing defects can cause the board to stop supplying voltage to the blower fan or freon supply valve (in two-compressor models). In such cases, a complete reboot often helps: disconnecting from the network for 15-20 minutes.
Below is a table of symptoms and probable malfunctions for various manifestations of the problem:
| Symptom | Probable reason | Difficulty of repair |
|---|---|---|
| The freezer is freezing, the top is warm, the compressor is silent | The temperature sensor or thermostat is faulty | Low |
| Humming constantly, cold no at the top, partially warm at the back | Freon leak or clogged capillary | High |
| There is ice in the freezer, the fan does not make noise | The fan is burned out or frozen | Medium |
| Indicators are blinking, display error | Control module failure or open circuit | High |
⚠️ Attention: Electronic control modules are very sensitive to humidity. If you carried out defrosting and did not properly dry the equipment before turning it on, water could get on the board, causing a short circuit.
Rules of operation and prevention
To avoid a situation where the refrigerator does not freeze well in one of the compartments, it is important to follow operating rules. Frequent and prolonged opening of doors, placing hot foods inside or loose seals lead to excess moisture formation. This moisture freezes and gradually disables the defrosting system.
Regular defrosting (even for systems No Frost recommended once a year) helps remove micro-ice plugs in the channels that the automation does not see. You should also check the tightness of the rubber seals: if the door warps, warm air will be constantly sucked in, causing the system to wear out.
Do not forget to keep the condenser grille at the back of the refrigerator clean. A layer of dust several millimeters thick can reduce heat transfer by 20-30%, which will lead to overheating of the compressor and ineffective operation of the entire cooling system.
When to call a specialist, and when can you handle it yourself?
If the problem is solved by completely defrosting the refrigerator within 24 hours, and after turning it on it again began to freeze correctly in both chambers, then most likely there was a failure in the defrosting system (the channel froze). In this case, you can try to operate the equipment further, but monitor the appearance of ice.
However, if after defrosting the cold in the upper chamber did not appear, or appeared but disappeared after a couple of days, this is a signal of a mechanical malfunction (leak, blockage, burnt heating element). Here you cannot do without calling a specialist and special tools.
Remember that intervention in the refrigeration circuit (soldering, refilling) requires a license and equipment. Unqualified repairs often lead to the fact that instead of replacing a cheap sensor, you have to replace a compressor that has burned out due to overheating, which is not economically feasible.
Is it worth repairing an old refrigerator?
Repair is advisable if the cost of spare parts and labor does not exceed 50-60% of the cost of a new similar refrigerator. If you need to replace a compressor or overcook a foamed circuit in a refrigerator older than 10 years, it is often more profitable to purchase new equipment with a warranty and low energy consumption.
Why did the refrigerator work after defrosting, but after a week it stopped again?
This is a classic sign of a malfunction of the defrosting system (heating element, sensor or timer). While you were defrosting the refrigerator manually, the ice melted, the channels became free, and the cold went away. But since the automation was not working properly, ice accumulated again and blocked the system. The faulty element needs to be replaced.
Is it possible to operate the refrigerator if only the freezer is freezing?
For a short time - yes, the food in the freezer will not be lost. Continuous operation in this mode is harmful to the compressor, which works without rest, trying to cool the upper chamber. In addition, food in the refrigerator can deteriorate, creating a favorable environment for bacteria.
How to understand that the compressor has burned out and not just a leak?
If the compressor hums, but does not start (you can hear a clicking and buzzing), or vice versa - it is silent, although the thermostat requires cold, and at the same time it is hot - perhaps interturn short circuit If there is a leak, the compressor usually runs continuously and gets hot, but does not create enough pressure. An accurate diagnosis will be given only by measuring the current consumption and pressure in the system.
Does the amount of food affect the uniformity of cooling?
Yes, it does. An empty refrigerator keeps its temperature worse. However, if there are too many products and they are tightly packed, blocking the ventilation holes between the chambers, air circulation is disrupted. This can create the illusion of a breakdown when it is warm in one corner and cold in the other.
What to do if there is water in the refrigerator, but it is not freezing?
The water may be the product of melting ice due to a faulty defrost or a sign that the drainage hole is clogged with debris. Check the condensate drain hole (usually at the bottom of the rear wall of the refrigerator) and clean it with a brush or soft wire.