The situation when you open the refrigerator door, and it’s warm inside, can cause panic in any home cook. Products begin to deteriorate, stocks are dwindling, and the question arises of urgent repairs or the purchase of new equipment. Before calling the service center, it is important to carry out an initial diagnosis, since in many cases the problem is solved without calling a technician.
In this article we will look in detail at why the refrigerator does not freeze, which components could have failed and whether it is possible to fix the problem yourself. Understanding the principles of operation of the unit will help you save time and money, as well as keep food fresh.
Modern models, be it Indesit, Atlant or Bosch, are designed on a similar principle, but have their own design features. We will consider both problems common to all equipment, as well as specific nuances of different brands.
Primary diagnostics: checking power supply and settings
The most commonplace, but often ignored reason is the lack of electricity or broken settings. Make sure that the plug fits tightly into the socket and that the cable itself is not kinked. Sometimes the problem lies in a power surge, after which the equipment could go into protection mode.
Check the control panel. Perhaps one of the household members accidentally touched the temperature regulator, turning it to the minimum value, or activated the “Vacation” mode. In some models LG i Samsung an electronics failure can simulate a compressor breakdown.
Pay attention to the indicators. If the “Alarm” light is on or the temperature icon is blinking, this is a signal that the inside of the chamber is warmer than set by the program. Give the equipment 30-40 minutes to stabilize after defrosting or rearranging.
- 🔌 Check for voltage in the outlet using another electrical appliance.
- ❄️ Make sure the thermostat is not at minimum (usually number 1 or Min).
- 🔇 Listen: is the motor running, or is there complete silence?
If everything is in order with the electricity, and the settings are lost, return them to the factory values. Often this is enough to cooling cycle resume. Do not rush to disassemble the equipment until you have ruled out external factors.
⚠️ Attention: If you hear relay clicks when you try to start, but the compressor does not start, do not try to turn it on repeatedly. This can permanently damage the start-up relay or motor windings.
Problems with the thermostat and temperature sensors
The thermostat (thermostat) is the “brain” that commands the compressor to turn on or off. In older models this is a mechanical device with a capillary tube, in new ones it is an electronic sensor. If it is faulty, the refrigerator simply “does not know” that it has become warm inside.
If a mechanical thermostat breaks down, the circuit does not close and the motor is silent. In models with No Frost air sensors are responsible for the temperature. Their failure often leads to the fact that the unit works non-stop, but does not freeze, or vice versa - it is turned off.
Diagnostics of the thermostat often requires a multimeter. You need to “call” your contacts. If, when the sensor is cooled (for example, by lowering it into cold water), the resistance does not change or the contact does not appear, the part requires replacement.
In modern Whirlpool i Haier sensor malfunction is often indicated by an error code on the display. Decoding the code will help you determine exactly which sensor is malfunctioning - evaporator, condenser or air.
- 🌡️ A mechanical thermostat is checked by checking the contacts in cold and warm states.
- 💻 Electronic sensors in No Frost systems often fail when contacts oxidize.
- 🔄 Replacing the thermostat is a procedure that can be performed independently if you have the tools.
How to check the thermostat without instruments?
Remove the thermostat and lower its sensitive tube into a container with ice water for 2-3 minutes. Then call your contacts. If there is no sound signal, the thermostat is faulty and requires replacement. In working condition, during cooling, the contacts must close.
Replacing this element usually does not require defrosting the system (in the case of mechanics) or takes a minimum of time. The main thing is to choose an analogue with identical parameters, since different models have different capillary tube lengths and temperature ranges.
Faults of the compressor and start relay
The compressor is the heart of the refrigerator. It is he who drives the refrigerant through the system. If the motor hums but does not start, or turns on for a couple of seconds and clicks, the problem is most likely in the start relay or the engine itself.
The start relay is a small plastic box on the side of the compressor. There is a mechanism inside that gives the starting impulse. Over time, the contacts burn out, or the bimetallic strip loses its properties. Replacing the relay is inexpensive and can be completed in 15 minutes.
A more serious problem is turn-to-turn short circuit the compressor windings or its wedge. In this case, the motor may become very hot and hum, but not rotate. Repairing the compressor at home is impossible; the entire unit must be replaced.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| Motor silent, no light | Problem with wiring or board | Medium |
| Beeps for 5-10 seconds and clicks | Faulty starting relay | Low |
| Heats up a lot and buzzes | The compressor is jammed | High (replacement) |
| Works without stopping | Freon leakage or sensor | Medium/High |
☑️ Compressor diagnostics
If you find that the compressor is hot and the refrigerator is cold, let the equipment cool for at least 2 hours before turning it on again. This will help avoid the final failure of the unit.
Leakage of refrigerant (freon) and blockage of the system
Freon is a substance that, circulating through the tubes, takes away heat. If a microcrack has formed in the circuit, the gas gradually evaporates. At first, the refrigerator begins to freeze worse, then it stops completely, and the compressor works without interruption, trying to gain temperature.
Signs of a leak: hot sides (instead of warm), swelling of the back wall inside the chamber, lack of cold when the motor is running. Finding and sealing a leak on your own is difficult; the system must be evacuated and filled with new gas.
Clogged capillary tube is another mechanical problem. Oil circulates in the system, which over time can thicken or mix with breakdown products, forming a plug. The symptom is similar to a leak: the compressor is running, there is no cold, but the condenser (grid at the back) may be cold.
⚠️ Attention: Freon is odorless and colorless. If you smell a strange chemical smell, it could be an oil leak from the compressor or burnt wiring, not the refrigerant itself.
To eliminate these problems, you need a technician with equipment: a leak detector, a vacuum pump and a cylinder with freon. Attempts to “top up” the gas without eliminating the hole will only give a temporary effect.
Failures in the No Frost defrosting system
In refrigerators with the system No Frost ice does not form due to constant air circulation. The evaporator, fan and defrost system are responsible for this. If one of the elements breaks, the evaporator becomes overgrown with ice and air stops flowing into the chambers.
Key elements of the system:
1. Defrost heating element (heater).
2. Defrost sensor (defrost thermostat).
3. Defrost timer (or control module).
If the heating element burns out or the sensor sticks, the ice does not melt during a pause in the compressor operation. With each cycle it becomes more and more until it completely blocks the air supply channels. This can be seen visually by disassembling the back panel in the freezer.
- ❄️ The compressor is working normally, but it is warm in the chambers.
- 🧊 A large lump of snow or ice is visible on the back wall of the freezer.
- 💨 The fan may be humming or not spin due to icing of the blades.
The solution to the problem is to completely defrost the refrigerator (at least 24 hours with the doors open) and then replace the burnt element. Often they change the entire chain: heating element + sensor to avoid repeated repairs.
When you need to call a professional technician
Not all breakdowns can be fixed with your own hands. If the diagnostics showed a freon leak, a clogged capillary, or a malfunction of the compressor itself, it is better to entrust the repair to specialists. This guarantees the tightness of the system and correct filling.
A master is also needed if the problem lies in the electronic control module. Resoldering contacts or replacing burnt tracks on a board requires soldering equipment and knowledge of circuit design. Errors here can lead to complete failure of the equipment.
It is worth considering the age of the refrigerator. If the equipment is more than 10-12 years old, replacing expensive components (compressor) may not be economically feasible. In such cases, it is easier to purchase a new model that will be more energy efficient.
Why does the refrigerator freeze but does not turn off?
This is a classic sign of a freon leak or blockage. The compressor tries to compensate for the lack of cold and works to wear out. Also, the reason may be a loose fit of the door seal, which is why warm air constantly gets inside.
Is it possible to use a refrigerator if it does not freeze?
For a short time - yes, like a cabinet. But you cannot keep it on for a long time in the event of a malfunction (especially if the compressor does not turn off). This will lead to overheating and burning of the motor, which will make repairs impossible.
How long should defrosting last?
For high-quality thawing of ice in the No Frost system, a minimum of 12, and preferably 24, hours is required. Do not speed up the process with a hairdryer or boiling water - a sharp temperature change can damage the plastic case and evaporator tubes.
What to do if after defrosting the refrigerator does not freeze again?
If after 24 hours of defrosting and turning on the equipment started working, but after a couple of days the situation repeated itself, it means the defrosting system (heating element or sensor) is faulty. If there is no cold immediately, there is a problem with freon or the compressor.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require regular defrosting to remove ice, but once every 6-12 months it is recommended to turn off the equipment for a day for hygienic washing and checking the condition of the drainage holes.