The situation when you open the door of a household appliance, and there is room temperature instead of pleasant coolness, always takes you by surprise. Product spoilage begins within a few hours, so you need to act quickly and competently. There can be many reasons why refrigeration unit ceases to perform its function, there can be many: from a banal power outage to a complex technical malfunction of the compressor.
Before you panic and call a technician, you should carry out the initial diagnostics yourself. In many cases, the problem is resolved without major intervention in the system. However, ignoring the symptoms can lead to complete failure of expensive equipment. Let's figure out why The refrigerator is not freezing and what to do first.
Primary diagnostics and external factors
The most obvious thing that needs to be checked first is the presence of power supply. Perhaps you accidentally touched the plug, or there was a power surge that knocked out the plugs. Make sure the control panel lights are on and the light inside is on. If the device is completely de-energized, check the outlet using another device, for example, a phone charger.
The second important point is the operating mode. Modern models Samsung, Bosch or LG are often equipped with the “Vacation” or “Economy” function, which puts the equipment into minimum consumption mode, essentially turning off the freezer. Check the settings on the display or mechanical controls. It is also worth remembering whether you have defrosted the unit recently: if you turned it on too early, the system may not have time to reach operating mode.
⚠️ Attention: If, after defrosting, you turned on a refrigerator full of warm food, it may not freeze for a long time. The system is overloaded, trying to cool a large volume of heat.
Users often forget about the door being tightly sealed. If seal the door is worn out, dirty or warped, the cold will escape and the compressor will work in vain. Do a simple test with a piece of paper: hold it in the door and try to pull it out. If the paper is pulled out without resistance, the seal is broken.
- 🔌 Check the electrical connection and the integrity of the cord.
- ❄️ Make sure that the “Vacation” or “Super Cooling” mode is not activated.
- 🚪 Inspect the rubber seal for cracks and dirt.
- 🌡️ Give the equipment time (up to 24 hours) after transportation or defrosting.
Problems with the thermostat and temperature sensors
One of the common reasons for the lack of cold is the exit from building thermostat. This small device is responsible for turning the compressor on and off depending on the temperature inside the chambers. If it is “stuck” in the “Off” position or simply breaks down, the motor-compressor will not receive a signal to start, and the cold will no longer be produced.
In more modern models operating on the system No Frost, instead of a mechanical regulator, electronic ones are used temperature sensors (thermostats). They are located in different areas: in the freezer, on the evaporator or in the freshness zone. If one of the sensors transmits incorrect data to the control module, the system may “think” that cold is already present and not start cooling.
Diagnostics of the thermostat in mechanical models is often carried out by the method of elimination. If, when you turn the regulator knob, you do not hear a characteristic click, and the compressor is silent, a breakdown is likely. In electronic systems, a sensor error is usually indicated by a code on the display or blinking indicators, which greatly simplifies troubleshooting.
| Symptom | Possible cause | Action |
|---|---|---|
| Compressor does not start | Thermostat is faulty | Replacement of the regulator |
| The refrigerator freezes poorly | Sensor settings are lost | Calibration or replacement |
| Continuous operation motor | Sensor “frozen” | Checking contacts |
| Temperature indicator flashing | Electronics error | Board diagnostics |
Faults compressor and start relay
The heart of any refrigerator is compressor. If it doesn't work, there won't be any cold anywhere. You can determine its condition by ear: a working unit emits a smooth, quiet hum. If you hear a click, an attempt to start and a click again, after which there is silence, the problem most likely lies in starting relay or the motor itself.
The starting relay is a small part that provides an impulse for engine start. Over time, the contacts in it burn out, and it ceases to perform its function. Replacing a relay is an inexpensive and quick procedure. However, if, when turned on, a loud hum is heard, and then a sharp shutdown click, and this is repeated cyclically, this may indicate an interturn short circuit in the compressor windings.
⚠️ Attention: If the compressor runs continuously without turning off for days, but does not freeze, this is a sign of a refrigerant leak or loss of performance of the unit itself. Operation in this mode will quickly lead to its burning out.
In some cases, especially after power surges, it may fail. inverter compressor. Unlike conventional ones, they do not make on/off sounds, but smoothly regulate power. If the inverter module burns out, the refrigerator will simply stop cooling, while remaining absolutely silent.
How to check the starting relay?
Remove the relay from the compressor and shake it. If a ringing sound is heard inside (as from broken glass or stones), it means that the mechanism is destroyed and requires replacement. Under normal conditions, it should be quiet inside.
Freon leak and capillary tube clogged
The refrigerant (freon) circulates in a closed circuit, transferring heat. If a microcrack has formed in the system, the gas gradually evaporates. At first the refrigerator starts to freeze worse, then it stops completely. Since freon is colorless and odorless, it is impossible to notice the leak visually without special equipment.
Another technical problem is clogged capillary tube. During operation, oxidation products may form in the system or moisture may enter, which turns into an ice plug. This blocks the circulation of refrigerant. As a result, the compressor hums, trying to pump gas, but the cooling capacity drops to zero.
- 📉 The temperature drops very slowly or does not drop at all.
- 🔊 The compressor works intermittently or too much for a long time.
- 🌡️ The condenser grille at the back remains cold (normally it should warm up).
- 💨 Barely warm air may blow from the freezer.
To eliminate these faults, you need to call a technician. The specialist will conduct pressure testing the system with nitrogen, find the leak, seal it, replace the filter drier and fill a new volume of freon. It is impossible to carry out this work independently without a vacuum pump and a pressure gauge station.
Failures in the No Frost system
If your refrigerator is equipped with a system No Frost, the lack of cold may be due to impaired air circulation. In such models, cold is produced in the freezer and distributed by a fan throughout the refrigerator compartment. If the fan has stopped, there will be ice in the freezer and heat in the main chamber.
A common problem is evaporator freezing. The defrost timer and defrost thermostat are responsible for defrosting the ice. If one of these elements fails, the ice does not melt, a “fur coat” grows and blocks the air ducts. Air stops flowing into the chamber, and the food spoils. Defrost heating element, defrost timer and defrost thermostat. If one of these elements fails, the ice does not melt, a “fur coat” grows and blocks the air ducts. Air stops flowing into the chamber, and the food spoils.
You can diagnose the problem by listening to the operation of the device. If you don't hear the fan running when the door is open (in some models it stops, in others it continues to run), or if you hear the sound of breaking ice behind you, the defrost system is faulty. Another sign may be that after complete defrosting (for 24 hours), the refrigerator begins to freeze perfectly, but after a couple of days the problem returns.
⚠️ Attention: Do not try to scrape the ice from the evaporator with a knife or other sharp objects. You can damage thin tubes or wiring, which will lead to expensive repairs.
☑️ Symptoms of breakdown No Frost
When professional repairs are needed
Understanding when you should take up the tool, and when it is better to call a specialist, will save you money and nerves. If the problem lies in a burnt-out light bulb, a clogged drain hole, or an incorrectly set mode, you can handle it yourself. But there are cases that require the intervention of a professional. First of all, this is any work related to a sealed circuit. Secondly, if a compressor replacement or complex electronic diagnostics of the control board is required. Modern refrigerators are complex computerized systems, where it is impossible to find an error without special software and testers.
First of all, this is any work related to refrigerant and a sealed circuit. Secondly, if a compressor replacement or complex electronic diagnostics of the control board is required. Modern refrigerators are complex computerized systems, where it is impossible to find errors without special software and testers.
It is also worth contacting the service if you notice blackening of the tubes, a smell of burning or oil, or if the equipment is under warranty. Opening the seals on your own during the warranty period will automatically void the free service.
Is it worth repairing an old refrigerator?
If the refrigerator is more than 10-12 years old and the compressor needs to be replaced, repairs can amount to up to 70% of the cost of new equipment. In such cases, it is often more profitable to buy a new unit with a guarantee and a modern energy efficiency class.
Frequently asked questions (FAQ)
Why does the refrigerator hum but not freeze?
This is a classic sign of a freon leak or a clogged capillary system. The compressor tries to pump gas, but due to a lack of refrigerant or an obstruction in the tube, no pressure is created and no cooling occurs. It is also possible that the compressor itself may jam.
How long does it take for the refrigerator to start freezing after turning on?
Usually it takes from 2 to 6 hours to reach operating mode. If the refrigerator was transported lying down or in hot weather, the waiting time may increase to 12-24 hours. At this time, do not load food inside.
Can the refrigerator stop freezing due to overload with food?
Yes, if you loaded a large amount of warm food or packed the chamber too tightly, air circulation is disrupted. This is especially critical for systems No Frost. Let the equipment run idle for several hours.
What to do if there is ice in the freezer and heat in the refrigerator?
Most likely, there was a failure in the defrosting system or the blower fan stopped. Try defrosting the refrigerator completely (for a day). If after switching on the problem recurs a few days later, the heating element, timer or defrost sensor needs to be replaced.