The situation when you completely defrosted the unit, carefully We washed the cameras, turned on the equipment, but the temperature inside did not decrease, causing panic. It would seem that a break from ice should prolong the life of the device, but in practice the opposite often happens. The refrigerator stops freezing it is after such procedures, and there are a number of technical explanations for this related to the peculiarities of the compressor and thermoregulation.
The most common mistake is turning on the device too early. If you were in a hurry and connected the power without allowing the oil in the compressor to settle, or did not wait for the internal electrical circuits to dry completely, the system could go into protective mode. In this case, the motor hums, but does not generate cold, or does not start at all. Inverter models and classic NoFrost systems react to such surges in different ways, but the result is the same - the products begin to deteriorate.
You should not immediately call a technician if the unit is silent or running idle. Often the problem lies in a banal electronics failure or stuck contacts, which can be easily fixed on your own. However, there are also more serious symptoms indicating a refrigerant leak or failure compressorthat require professional intervention. In this article we will analyze in detail all possible scenarios.
⚠️ Attention: If after turning on you hear a loud click, and then silence, and this repeats several times, immediately unplug the device. This is a sign of an attempt to start a faulty compressor or start relay, and further operation may lead to burnout of the motor winding.
Violation of the rules for turning on after defrosting
Many users forget about the fundamental rule of operating compressor equipment. After defrosting, especially if you washed the refrigerator with a lot of water or rearranged it, you should not turn it on immediately. The oil that circulates in the system along with freon could get into the cooling circuit during downtime and tilt of the unit. It needs time to flow back into the crankcase of the compressor.
If you start the engine when the oil is in the evaporator or condenser tubes, a so-called hydraulic shock is created. The compressor tries to compress the liquid, which is detrimental to it. In the best case, the thermal protection relay will work and the unit simply will not start. At worst, mechanical damage to the valves will occur. Modern refrigerators They often have protection, but it’s not worth the risk.
It is also critical to let all internal components dry. Moisture that gets on the contacts of the thermostat or the control unit causes a short circuit or corrosion. Even if everything is visually dry, a microscopic film of water can disrupt the conductivity of signals. Wait at least 2-4 hours after thorough drying before turning on for the first time.
Problems with the defrost timer and sensors
In systems NoFrost and modern models with a drip defrosting system, automation plays a key role. If the refrigerator does not freeze after defrosting, there is a high probability that a failure has occurred in the defrost cycle control circuit. The defrost timer could be “stuck” in heating mode, which is why the compressor does not receive commands to start.
Temperature sensors (defrost thermostats) also often fail. Their job is to monitor the temperature of the evaporator and stop heating when the ice has melted. If the sensor “lies” and shows that the evaporator is still hot or, on the contrary, too cold, the control unit blocks the operation of the motor. Defrost sensor is a consumable material that loses its properties over time.
Diagnostics of these elements requires testing with a multimeter. A faulty timer often makes a characteristic hum, but does not switch contacts. The sensors are tested for resistance: if it is infinitely large or equal to zero at room temperature, the element requires replacement. This is a common reason why the refrigerator hums, but does not freeze.
☑️ Diagnostics of the defrost system
It is worth noting that in some models, if the sensors are faulty, the refrigerator can operate in emergency mode, turning on the compressor for short periods of time. This is not enough to freeze food, but the fan can still work properly, creating the illusion of normal operation of the system.
Electronic control module failure
Electronics are the brain of your refrigerator. Voltage surges during switching on after defrosting, moisture ingress or simply age-related wear can lead to malfunction control unit. Control boards in Indesit, Bosch, Samsung and other brands are sensitive to current fluctuations.
Symptoms of failure can be different: the refrigerator does not respond to buttons at all, indicators blink, or the device operates chaotically. Sometimes a simple reboot helps - disconnecting from the network for 15-20 minutes. This allows the capacitors to discharge and the processor resets errors. If after this the equipment works, you are lucky.
⚠️ Attention: If after a reboot the situation repeats and error codes are displayed on the display (for example, F5, E2 or “Alarm” is blinking), do not try to disassemble the module yourself. Repairing the board requires soldering and replacing radio components, which only a specialist can do.
Moisture is the main enemy of electronics. If you washed the back wall or doors during defrosting, water may have flowed behind the control panel. Even after drying, salt deposits could remain on the board, causing corrosion of the tracks. In such cases, it is necessary to clean the board with an alcohol solution or replace it.
Hidden signs of module combustion
If you smell a slight smell of burning plastic or see blackening on the contacts of the board connector, this is a sure sign of thermal damage. Operating such a refrigerator is dangerous.
Refrigerant leak and system blockage
One of the most unpleasant reasons why the refrigerator stopped freezing is a freon leak. Often it occurs precisely at the soldering points of the evaporator tubes, which are located inside the housing (behind the foam wall). During defrosting, if you picked out the ice with a knife or suddenly changed the temperature, the metal could develop a microcrack.
The second option is a blockage of the capillary tube. Oil and freon circulate in the system. If there is moisture in the system (which is likely if the refrigerator was left open for a long time while defrosting), it freezes in a narrow place in the capillary, forming an ice plug. Freon cannot circulate and cold is not produced.
| Symptom | Probable cause | Characteristic symptom |
|---|---|---|
| The compressor runs constantly | Leakage freon | Condenser (grid at the back) is cold or only partially warm |
| The motor turns on for 1-2 minutes | Capillary blockage | Gurgling or hissing is heard, then silence |
| The refrigerator is silent | Loss of pressure | Sensors do not detect temperature changes |
| Uneven cooling | Lack of refrigerant | The freezer is working, the main compartment is warm |
It is difficult to diagnose a leak or blockage at home. A pressure gauge station is required to check the pressure in the circuit. If the pressure is below normal or is absent at all, a professional Freon charging search for the leak site is necessary. You cannot add gas yourself, as you need to know the exact brand of refrigerant and dosage.
Malfunction of the compressor and start relay
The heart of the refrigerator is the compressor. If after defrosting it does not start, hums but does not turn, or makes clicking noises, the problem may be in the start-up relay. This device is responsible for starting the engine and protecting it from overheating. The relay often fails due to power surges or natural wear.
Replacing the relay yourself is not difficult: it is removed from the compressor fitting and replaced with a similar one. However, if after replacing the relay the situation has not changed, and the motor still hums and heats up, the windings or the piston group may have become jammed. In this case, the compressor needs to be replaced. turn-to-turn short circuit windings or jamming of the piston group. In this case, the compressor needs to be replaced.
It is important to distinguish the normal hum of a running motor from the hum accompanied by vibration of the housing and heating. If the compressor is hot to the touch (more than 60-70 degrees) and does not start, further attempts to turn it on may lead to a fire.
Mechanical damage and errors during defrosting
Often the reason that The refrigerator does not freezelies in the actions of the user himself during defrosting. The use of sharp objects (knives, screwdrivers) to chip ice is the main cause of evaporator breakdown. Thin aluminum tubes are easily damaged, which leads to an instant release of freon.
It is also dangerous to defrost the unit using hair dryers or heaters. A sharp temperature change can lead to deformation of plastic elements, cracks in the evaporator housing, or even fire of the wiring. Natural defrosting takes more time, but is the only safe method.
Do not forget to check the tightness of the door after defrosting. If you haven't wiped the seal well or warped the door when washing, the cold will escape and the compressor will wear out and not reach the set temperature. The magnetic tape must be clean and intact.
⚠️ Attention: If you accidentally pierce the evaporator with a knife and hear a hissing sound (gas escaping), immediately ventilate the room. Although modern freons are not toxic in small doses, they displace oxygen. It is useless to seal the hole with tape - soldering and vacuuming of the system are required.
How to check the integrity of the seal
Pinch a sheet of paper with the refrigerator door. If it is pulled out easily without resistance around the entire perimeter, the seal is worn or dirty and requires replacement or cleaning.
Frequently asked questions and answers (FAQ)
How long should the refrigerator cool down after defrosting before turning it on?
The minimum waiting time is 2 hours, but it is considered optimal 4 hours. This is necessary so that the oil flows into the compressor and all moisture from hard-to-reach places evaporates. Turning on before this time can lead to water hammer.
Why does the refrigerator work, but does not freeze after defrosting?
Most likely, a freon leak occurred due to damage to the evaporator or the refrigerant circulation was disrupted (clogging). It is also possible that temperature sensors may fail because they “do not see” the heat inside the chambers and do not give a command for active cooling.
Is it possible to defrost a refrigerator with a hairdryer?
It is strictly not recommended. Hot air can melt the plastic evaporator box, deform seals and damage electronic components. In addition, sudden heating is dangerous for the aluminum tubes of the cooling system.
What to do if an unpleasant odor appears after defrosting?
The smell can be caused by residual water in the drainage system, where bacteria have begun to multiply, or the smell of burnt insulation if a short circuit has occurred. In the first case, flushing the drainage will help, in the second, electrical diagnostics by a technician is required.
Do I need to set the temperature again after defrosting?
In most modern models, the settings are saved in memory. However, after the first cooling cycle it is recommended to check the settings. Sometimes, after a power surge, the settings may go back to factory settings, which is not always optimal for your conditions.