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 there is an urgent need to understand why the refrigerator does not freeze. Sometimes the problem is solved by simply adjusting the thermostat or defrosting, but in other cases there is a serious breakdown of the unit that requires the intervention of a technician.
In this article we will analyze in detail all the possible causes of the malfunction, from a banal lack of electricity to the failure of the compressor. You will learn to carry out initial diagnostics yourself to understand whether you can repair the equipment yourself or whether you need to call a specialist.
Ignoring the first signs of a malfunction often leads to complete failure of the equipment. If you notice that refrigerator it is working intermittently or the temperature inside has begun to rise, you need to act immediately. A correct and timely reaction will allow you to save food and avoid expensive repairs.
Primary diagnostics: simple reasons for stopping cooling
Before you panic and look for the phone number of a service center, it is worth checking the basic things. Very often the refrigerator is not freezing due to the fact that it is simply turned off or the traffic jams in the apartment are broken. Check whether the indicator light on the housing is lit. If not, make sure that the plug is firmly inserted into the socket and that there is voltage in the socket itself.
The second common reason is incorrect setting of the temperature setting. Perhaps one of the household members accidentally moved the regulator to the “0” or “Min” position. In models with electronic control, the operating profile may have gone astray. If the refrigerator stops freezing immediately after defrosting, give it 3-4 hours to return to mode.
It is also worth paying attention to the tightness of the door. If the rubber band seal is dirty or damaged, cold air will escape faster than it is produced. In this case, the equipment will work constantly, but will not be able to reach the desired temperature. Check whether foreign objects are interfering with the tight closure of the seal
- 🔌 Check for voltage in the outlet and the integrity of the power cord.
- ❄️ Make sure the thermostat is not set to the minimum value.
- 🚪 Inspect the rubber seal for cracks and dirt.
⚠️ Attention: If you have just defrosted and turned on the unit, do not expect instant results. Reaching operating mode can take up to 24 hours, especially in hot weather.
Problems with the defrosting system in No Frost models
If you have a modern unit with a system No Frostthat has stopped freezing, most likely the defrosting system has failed. In such models, frost constantly forms on the evaporator, which must periodically melt. The heating element, defrost sensor and timer (or electronic module) are responsible for this process.
When one of these elements breaks, the evaporator becomes overgrown with a “coat” of ice, which blocks the circulation of cold air. As a result, the chambers become warm, although the compressor may work properly. Signs of such a breakdown are often extraneous sounds or visible ice behind the back wall.
For diagnostics, you will need to ring the circuit with a multimeter. Often the sensor burns out or gets stuck. Replacing these parts usually does not cause difficulties for a home craftsman, but requires partial disassembly of the inside of the freezer. Defrost heating element or the sensor is stuck. Replacing these parts is usually not difficult for a DIYer, but requires partial disassembly of the inside of the freezer.
☑️ Diagnostics of the No Frost system
| Faulty element | Symptom | Probability of breakdown |
|---|---|---|
| defrost heating element | Ice on the evaporator, no heating during defrosting | High |
| Defrost sensor | no heating element turns on or does not turn off | Medium |
| Defrost timer | The refrigerator does not go into defrost mode | Low |
Compressor and starting faults relay
The compressor is the heart of the refrigerator. If it doesn't start, there will be no cooling anywhere. You can often hear the engine trying to start, making a clicking sound and then going silent. This is a classic sign of a malfunction starting relay or the compressor itself. The relay is responsible for supplying the starting impulse, and replacing it is inexpensive.
If the compressor hums, but does not start, or, conversely, is silent and does not heat up, the reasons may be more serious. In the first case, jamming of the piston group or interturn short circuit of the windings is possible. In the second case, the thermal protection has tripped or the electronic control module has failed.
You can check the starting relay visually (for carbon deposits) and by ear (for rattling of the ball inside). To replace the relay, you do not need special tools; just remove it from the compressor pins and install a new one, strictly observing the orientation indicated by the arrow on the part body.
⚠️ Attention: Do not try to repair the compressor itself or open it. This is life-threatening and requires special equipment for evacuation and charging with freon.
How to check the serviceability of the compressor?
To check, you need to disconnect the start relay and ring the motor windings with a multimeter. The resistance between the contacts must be in a certain range (usually 10-30 Ohms), and there should not be a short circuit to the housing.
Freon leakage and capillary tube blockage
The refrigerant (freon) circulates in a closed circuit. If a microcrack has formed in the system, the gas gradually evaporates. At first the refrigerator starts to freeze worse, then it stops completely. A characteristic sign of a leak is swelling of the rear wall inside the chamber (where the evaporator is sealed) or the appearance of rust on the pipes at the back.
A clogged capillary tube is the other side of the coin. Moisture or oil breakdown products enter the system, which form a plug. Freon cannot circulate, the pressure drops, and there is no cooling. In both cases, you need to call a specialist with a filling and vacuum station.
It is impossible to eliminate a leak or blockage on your own. Attempts to simply “add gas” without finding the leak and replacing the filter-drier will only lead to a temporary effect and eventual breakdown of the compressor due to moisture entering the system.
- 🕵️ Look for oily spots on the tubes at the back of the refrigerator.
- 🌡️ Pay attention to the temperature of the condenser (grid) rear) - it should heat evenly.
- 🔇 Listen: if there is a leak, the compressor can work almost without stopping.
Failure of the thermostat and control module
The thermostat (thermostat) is a sensor that tells the compressor when to turn on and when to turn off. If it is broken and “thinks” that it is already cold in the chamber, it will not give the command to start the motor. In two-compressor models, failure of one thermostat will result in one chamber freezing and the other not.
In modern electronically controlled models, the thermostat function is performed by a temperature sensor connected to control module. A failure in the electronics, oxidation of the contacts, or failure of the sensor itself causes the cooling cycle to stop. Often, error codes light up on the display.
The thermostat can be diagnosed by closing its contacts directly (for mechanical models). If the refrigerator starts working after this, the reason has been found. Electronic sensors are checked only by replacing or measuring their resistance at different temperatures.
When an urgent call to a technician is necessary
There are situations when independent repairs are not only useless, but also dangerous. If you hear a loud knock, whistle, or see sparking in the compressor area, immediately unplug the appliance. You also need a technician if you need to replace a compressor, fix a freon leak, or repair an electronic unit.
You should not delay contacting service if the products begin to quickly deteriorate. Delay can lead to simple repairs turning into replacement of expensive components. Professional diagnostics often take less than an hour and allow you to accurately determine the scope of work.
Remember that a qualified specialist will always provide a guarantee for the work performed and spare parts used. This is more important than saving on calling a technician for complex faults.
⚠️ Attention: Repair prices and spare parts availability may change. Before starting work, be sure to agree on the final cost with the technician or service center.
Why does the refrigerator hum but not freeze?
If a hum is heard, it means the compressor is trying to work. Most likely, the problem is in the start relay (it cannot start) or in the freon circulation system (clogged or leaking). It is also possible that the motor may jam.
Is it possible to operate the refrigerator if it does not freeze?
For a short time - yes, to carry out diagnostics. But prolonged operation during a malfunction (especially if the compressor does not turn off) will lead to overheating and combustion. It is better to turn off the device until the cause is eliminated.
How long does it take for the refrigerator to start freezing after turning it on?
Usually the first cold appears after 30-40 minutes. Complete cooling to the set temperature takes from 2 to 12 hours, depending on the model, the volume of the chambers and the number of loaded products.