The situation when you open the refrigerator, and there are leaking food and complete defrosting, always causes panic. Freezer compartment it may stop working for many reasons: from a banal sticking of the defrost button to a serious breakdown. compressor. It is important not to get confused and carry out an initial diagnosis in order to understand the scale of the problem and the need to call a technician.
In this article we will analyze in detail the main symptoms of malfunctions, explain how the system works No Frost and why it fails. You will find out which components most often fail in modern models Indesit, Atlant or Bosch, and whether you can fix the problem yourself without a special tool.
You should not ignore the first signs: the build-up of an ice crust, the appearance of extraneous sounds, or simply insufficient cooling. Timely detection the cause of the breakdown can be saved an expensive compressor from overheating and complete failure, saving your products and budget.
⚠️ Attention: If you feel a strong burning smell or see sparking in the electrical wiring area, immediately disconnect the device from the network. Operation of faulty electrical equipment can lead to a fire.
Main symptoms of freezer malfunction
The first signal that refrigeration circuit is not working correctly is a change in temperature inside the chamber. The food begins to thaw, the meat becomes soft, and the frost disappears on the walls where it should be. In systems No Frost there should be no frost at all, but ice can accumulate in hidden places, blocking ventilation.
Often a breakdown is preceded by extraneous sounds. The hum may become louder and there may be a knocking, clicking or whistling sound. The compressor can work continuously without turning off, or, conversely, turn on for a couple of seconds and immediately stall. These acoustic signs help an experienced technician determine the type of malfunction before disassembling the unit.
Pay attention to condenser grille the back of the refrigerator. Normally it should be warm or hot. If the grate is cold but the compressor is hot, this is a sure sign of a refrigerant leak or a blockage in the capillary tube. If the grille is cold and the compressor does not work at all, the problem is in the electrics.
Problems with the power supply and thermostat
The simplest reason why the camera does not freeze lies in the lack of power. Check whether it lights up light bulb when the door is opened. If there is no light, the circuit breaker in the panel may have been knocked out, the socket is faulty, or the power cord is broken. In modern models with electronic control, the absence of an indication on the display will also indicate problems with control module.
If the light is on, but there is no cold, suspicion falls on thermostat (thermostat). This device is responsible for turning the compressor on and off. If there is a malfunction, it may “think” that it is already cold enough in the chamber and not give the command to start the motor. In mechanical models, this is solved by replacing the thermostat; in electronic models, by diagnostics temperature sensor.
To check the thermostat in mechanical refrigerators, you can carefully close its contacts (after turning off the refrigerator!). If the engine starts, it means the culprit has been found. However, in models with electronic board such methods can lead to a short circuit, so it is better to use a multimeter to check the continuity of the circuit.
Faulty compressor and start relay
Compressor is the heart of the refrigerator, which ensures the circulation of freon. If he is silent, although there is food, it is often to blame starting relay. This small device starts the motor. A characteristic symptom of its breakdown is a click, a buzz for 3-5 seconds, then another click and silence. The motor tries to start, but the relay opens the circuit, protecting the windings from combustion.
If the relay is working properly, but the compressor hums and does not start (or knocks out plugs), perhaps jammed motor or An interturn short circuit of the windings has occurred. In this case, the unit needs to be replaced. Also, the cause may be insufficient voltage in the network, which is important for private houses or dachas.
The table below shows the main symptoms of motor-compressor malfunctions:
| Symptom | Probable cause | Required actions |
|---|---|---|
| Buzzes for 5-10 seconds, clicks, is silent | The starting relay is faulty or jammed | Replacing the relay, checking the compressor |
| It gets very hot, works without stopping | Freon leakage or wear | Search for leaks, refueling, replacement |
| Strong vibration and noise | Destruction of suspension or shock absorbers | Replacing shock absorbers, checking fastenings |
| Smell of burning, smoke | Winding burned out | Urgent replacement of the compressor |
Can I replace the relay myself?
Yes, if you have basic electrical skills. The relay is simply removed from the compressor pins. The main thing is to buy exactly the same model (the marking is usually indicated on the body, for example, RCT3 or PTC).
Freon leakage and system blockage
If the compressor works almost non-stop, but there is little or no cold, and the condenser grill is cold (or is only partially heated), most likely it has occurred refrigerant leak. Freon could escape through a microcrack in sealed tubes, which often rot over time, or through damage in the evaporator (for example, if you pierced the wall with a knife during defrosting).
Another common problem is clogged capillary tube. Oil circulates in the system, which over time can thicken or mix with oxidation products, forming a plug. The symptom is similar to a leak: the compressor is hot, the grille is cold, but when the motor is running, a quiet gurgling or hissing sound can be heard from the tube.
In both cases, intervention by a technician with the equipment is required. It is necessary to find the location of the leak (often this is foamed part housing), solder the tubes, install a new filter drier and fill the system with the exact amount of freon. It is impossible to do this on your own without a vacuum pump and pressure gauges.
⚠️ Attention: Freon is a gas under pressure. Improper handling may result in injury. In addition, different refrigerator models require different types of refrigerant (R134a, R600a). R600a (isobutane) is explosive when in contact with air in a certain concentration, so working with it requires special care.
Failures in the defrosting system (for No Frost)
In refrigerator systems No Frost The evaporator is hidden inside the case, and the cold is pumped by a fan. If it stops working defrost heating element, timer or defrost sensor, the evaporator becomes covered with ice. The fan cannot drive air through the ice block, and the cold stops flowing into the chamber, although the compressor can work properly.
A sign of such a breakdown is freezing of the “fur coat” on the back wall inside the freezer (if you remove the plastic panel) or the complete absence of frost when the motor is running. The fan may also start to make noise or hit the ice with its blades. In this case, it is necessary diagnostics of the defrost circuit: ring the heating element, check the sensor and timer (or electronic module).
☑️ Diagnostics of the No Frost system
Often in such models it fails defrost sensor. It should record the temperature of the evaporator and turn off the heating element when the ice melts. If it “lies”, the system may not turn on at all or heat for too long, which also disrupts the operating cycle.
Problems with seals and tightness
Even a working refrigerator will not freeze if it is broken chamber tightness. The rubber seal on the door dries out over time, cracks or simply becomes dirty. Warm, moist air enters through the cracks, which condenses and freezes, forming an ice crust. The compressor tries to compensate for heat loss and wears out.
You can check the seal in a simple way: close the door on a sheet of paper. If the sheet is pulled out easily without resistance, the seal is broken. Also inspect the rubber for dents, peeling, or mold. Sometimes washing the seal with warm water and soap or leveling it with a hair dryer helps (carefully!), but more often it is necessary replacement of the circuit.
Frequently asked questions (FAQ)
Is it possible to operate the refrigerator if the freezer is not working and the main compartment is cold?
For a short time - yes, but the food in the freezer will disappear. However, if the cause is a freon leak, the compressor will work without rest, which will lead to its rapid combustion. It is better to turn off the device and call a technician.
Why does the freezer work, but the temperature is not low enough (-5°C instead of -18°C)?
This may indicate the initial stage of a freon leak, compressor wear (loss of performance) or a violation of the door seal. Also check that the vents are not clogged with food.
How long should you defrost the refrigerator before checking?
To completely defrost the No Frost system and evaporator, a minimum of 24 hours (preferably 24 hours) is required with the doors open. Only after this can you turn on the diagnostic device to exclude false readings due to an ice jam.
Does the new compressor hum louder than the old one?
Modern inverter compressors are quieter than the old ones. However, immediately after turning on, any motor can hum more strongly for several minutes until it picks up operating speed and the pressure in the system stabilizes.