The situation when Pozis refrigerator the upper chamber stops cooling, and there is still a minus in the freezer compartment, often takes you by surprise. This is a classic symptom of poor refrigerant circulation or temperature control problems. In contrast to a complete failure of equipment, when both chambers are silent, here the system is partially functioning, which narrows the scope of troubleshooting.
Owners of the units Pozis often encounter the fact that the products in the upper compartment begin to deteriorate, although the compressor is running and humming. This indicates that freon either the required volume does not reach the evaporator, or the compressor's cooling capacity has dropped. This signal cannot be ignored, as the malfunction can progress, leading to complete failure of the unit.
Before calling a technician, it is necessary to carry out an initial diagnosis. Often the reason lies in trivial things that you can fix yourself without opening technical components. However, if simple methods do not help, intervention in refrigeration circuit or replacement of electronic components will be required.
Primary diagnosis and checking of the thermostat
The most common reason that there is heat in the upper chamber is failure thermostat (thermostat). It is this sensor that “tells” the compressor when to turn on to cool the space. If its contacts are stuck open or it has lost sensitivity, the compressor may simply not start on command, even if the chamber is already warm.
To check, you need to remove the thermostat; it is usually located inside the fridge compartment or under the top cover. Carefully short the two wires coming from it, bypassing the sensor itself. If after this manipulation Pozis it hums and starts to get cold, the problem is definitely in the thermostat. Replacing it does not require complex skills and is inexpensive.
Some models use electronic control, where the role of a thermostat is performed by a temperature sensor (thermistor). It is tested with a multimeter, checking the resistance at different temperatures. If the values do not change or go to infinity, the sensor must be replaced. It is also worth checking the control board, since oxidation of the contacts on it can give false commands.
Problems with refrigerant: freon leak
The second most common reason for the lack of cold in the upper compartment is freon leak. The refrigerant circulates through the system: it first enters the freezer compartment (where the temperature is lowest) and then passes through the evaporator of the refrigerator compartment. If there is not enough gas in the system, it is only enough for the first stage, and the “cold” simply does not reach the top.
Leaks often occur in the foamed part of the body due to corrosion of the tubes or in places of factory soldering. It is difficult to determine this visually, but it is possible by indirect signs. Pay attention to the operation of the compressor: if there is a shortage of freon, it works almost non-stop, trying to gain temperature, but condenser (the grill at the back) heats up unevenly - only half or only at the beginning of the circuit.
It is important to understand that you can charge the system yourself refrigerant impossible without special equipment and skills. Trying to simply “add gas” without finding the leak will lead to a repeat breakdown after a few days or weeks. Professional diagnostics using a leak detector is required.
⚠️ Attention: If you notice an oily spot under the refrigerator or on the back wall near the compressor, this is a sure sign of depressurization of the system. It is impossible to operate such a unit - the compressor may burn out due to idle operation without oil cooling.
Faults of the compressor and start relay
The heart of any Pozis is the compressor. If it is not working properly, the pressure in the system drops and the refrigerant cannot circulate effectively. It often happens that the compressor hums, but does not start, or turns on for a couple of seconds and clicks. This indicates problems with starting relay or jamming of the piston group.
You can check the relay yourself. Remove the plastic cover from the side of the compressor, remove the relay and shake it. If a ringing sound is heard inside (as if from broken ceramics), it means that the part is destroyed and requires replacement. This is a cheap procedure that often brings equipment back to life.
A more serious problem is interturn short circuit the compressor windings. In this case, the engine hums and heats up, but cannot start. You can check this with a multimeter by measuring the resistance of the windings. If it differs from the nominal or shows a short circuit, the compressor will need to be replaced, which is an expensive repair.
Clogged capillary tube and No Frost system
In models with a system No Frost or drip defrosting, cleanliness is critical capillary tube. This is the thinnest channel through which liquid freon enters the evaporator. If there is moisture or oil breakdown products in the system, an ice plug or blockage will form.
If there is a blockage, freon cannot pass in full into the evaporator of the upper chamber. The freezer can still operate due to residual pressure, but the refrigerator compartment is defrosting. A characteristic sign is gurgling sounds during operation and a hot condenser only at the entrance to the filter-drier.
Removing the blockage requires purging the system with nitrogen under high pressure and replacing the filter-drier. At home, it is extremely difficult to perform this operation efficiently, since the system must be evacuated before refueling.
| Symptom | Probable cause | Difficulty of repair |
|---|---|---|
| The compressor is silent, there is no light | No power, Thermostat burned out | Low |
| Humming, clicking, does not start | Faulty starting relay | Low |
| Works without stopping, top warm | Freon leak, blockage | High |
| It gets very cold only at the back wall | The defrost sensor is faulty | Medium |
The influence of seals and defrosting mode
Do not discount the condition sealing rubber on the door of the upper chamber. If it is dirty, deformed or does not fit tightly, warm air constantly enters the chamber. The compressor tries to compensate for the heat, working for wear, but due to the constant thermal load, effective cooling of the products does not occur.
You can check the tightness using a sheet of paper. Clamp the sheet with the door around the perimeter. If it pulls out too easily or falls on its own, the seal is broken. In this case, thorough cleaning of the tires or replacing them will help. Also check whether the door is warping due to improper installation.
Another factor is defrost mode. If you just defrosted the refrigerator and turned it on with food inside, it may not reach temperature within 2-3 hours. Let the equipment run idle for at least 5-6 hours. If during this time the temperature has not dropped, the problem is technical.
The secret of checking the compressor
If touching the housing of a running compressor causes a slight tingling sensation (check with the back of your hand!), this may indicate a breakdown of the winding insulation. Such a compressor is dangerous and requires replacement.
Algorithm of actions when a malfunction is detected
If you are faced with the fact that Pozis the top has stopped freezing, act sequentially. Chaotic actions can aggravate the situation. First, rule out simple household causes, then move on to technical diagnostics.
First of all, make sure that the refrigerator is not overloaded with food and there is air circulation between them. Check the thermostat settings - perhaps someone accidentally moved the knob to minimum. Make sure that the unit is level and the distance to the wall is maintained.
If simple measures do not help, use the checklist to decide whether to call a technician. Independent repair of components associated with a sealed circuit without experience and tools is not recommended.
☑️ Diagnostics before calling a technician
When professional repairs are necessary
There are a number of situations where attempts at self-repair senseless and even dangerous. If diagnostics show a freon leak, not just refilling is required, but searching for the fistula, soldering and vacuuming. This is a job for a specialist with equipment.
Professionals are also needed when replacing a compressor. It is important not only to solder the new motor, but also to correctly select its power and oil characteristics (mineral or synthetic). An error in choosing a compressor will lead to its rapid failure.
Modern models Pozis with electronic control often require re-flashing the board or replacing complex electronics. Here you cannot do without a diagnostic stand that reads error codes that are invisible to the user.
⚠️ Attention: Never try to cut through the refrigeration circuit tubes or pierce them to “check the pressure”. Residues of freon can ignite upon contact with fire, and moisture entering the system will completely kill the compressor.
Why does the refrigerator freeze only near the back wall?
This is the normal operating mode for a drip defrosting system. The evaporator is built into the rear wall. However, if the food freezes “into ice” at the wall, and there is heat in the center of the chamber, the thermostat may be faulty or the melt water drainage channels are clogged.
How long does it take the refrigerator to reach the temperature after defrosting?
It takes from 4 to 8 hours to fully reach the mode. Pozis It takes from 4 to 8 hours. If after 10-12 hours of operation without food, the temperature in the upper chamber is above +10°C, there is a technical malfunction.
Is it possible to operate a refrigerator if it does not freeze the top?
For a short time - yes, but you cannot store perishable food there. Long-term operation in this mode is harmful to the compressor, which works without rest, trying to compensate for the loss of cold or lack of freon.