How to check the operation of the refrigerator: complete instructions
The sudden failure of household appliances or the appearance of strange sounds always causes alarm, especially when it comes to the safety of products. Refrigerator diagnostics This is the first step that must be taken before calling a technician or purchasing a new unit. Many faults can be identified independently using simple observation methods and basic tools that are found in every home.
Understanding the operating principles of your model Indesit, Bosch or LG will help distinguish normal operating noise from signs of breakdown. In this article, we will look at how to conduct a comprehensive check of cooling, electrical and tightness systems in order to make an informed decision on further actions.
Visual inspection and initial diagnostics
Any check begins with a careful examination of the external condition of the unit. Often signs of a malfunction are visible to the naked eye, and ignoring them can lead to more serious consequences. Inspect the body for bulges, dents or signs of corrosion, especially in the lower part where the compressor is located.
Pay attention to the door seals. If they are cracked, lost elasticity or do not fit tightly to the body, chamber tightness it is broken. This forces the compressor to work in increased mode, which quickly disables it. Check for puddles or oily stains on the floor under the refrigerator, which may indicate a refrigerant leak or problems with the condensate drainage system.
⚠️ Attention: If you find oily stains under the unit, this may indicate a breakdown of the compressor or a leak of freon along with oil. Operating such a device is dangerous and requires immediate disconnection from the power supply.
Inspect the rear radiator grille. It must be clean and not severely deformed. A grate clogged with dust and animal hair is one of the most common causes of overheating and ineffective operation of the cooling system. Carefully clean it with a dry brush or vacuum cleaner, without using sharp objects.
📊 How long ago did you completely defrost and clean the refrigerator?
Two weeks ago
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Checking temperature conditions and compressor operation
The main function of the refrigerator is maintaining the set temperature. To check whether the unit copes with this task, you will need a regular household thermometer. Place it in a glass of water and place it in the central part of the refrigerator, avoiding contact with the walls and shelves.
Leave the thermometer for at least 2-3 hours without opening the door during this period. For the freezer, the procedure is similar, but it is better to increase the exposure time to 4–6 hours. The following indicators are considered normal:
🌡️ Refrigerator compartment: from +2 to +5 °C
❄️ Freezer compartment: from -18 to -24 °C
📉 Freshness zone (if any): about 0 °C
Listen to the work compressor. In a working refrigerator, it turns on cyclically: a period of operation is followed by a period of rest. If the motor hums continuously, without turning off for hours, or, conversely, turns on too rarely and for a short time, retaining heat inside, this is a sign of a malfunction. A loud knock, clanging or shrill whistle also indicates problems with the mechanical part of the engine.
☑️ Diagnostics of temperature conditions
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It is important to consider that modern inverter models Samsung or LG are quieter and may not turn off completely, but only reduce the speed. In such cases, focus on temperature stability, and not on cyclical switching on.
Door tightness test
Tight fit of the door is the key to energy efficiency and long service life of the equipment. If warm air penetrates into the chamber through leaks, it will form ice coaton the walls, and the products will begin to deteriorate faster. You can check the tightness using a simple sheet of paper.
Take a regular A4 sheet or banknote. Close it with a door around the perimeter, closing it in different areas. If the sheet is pulled out easily, without resistance, it means that the seal does not fit tightly in this place. Walk along the entire contour of the door in this way.
Symptom
Possible cause
Action
The sheet falls out easily
Wear or contamination of the seal
Wash or replace the rubber band
The door does not close on its own
The hinges are skewed or there is an excess of products
Adjust the hinges or unload the shelves
A whistle is heard when closing
Too tight fit (vacuum)
Check the ventilation holes
Ice on the end of the door
Loss of elasticity of the seal
Treatment with silicone or replacement
If the seal is simply dirty, wash it thoroughly with warm water and soap. In case of loss of elasticity, you can try to restore the shape by heating the rubber with a hairdryer or hot water, but this is a temporary measure. Complete replacement of the seal is required if deep cracks or tears are visible on its surface.
Analysis of sound signals and vibration
A refrigerator is not a silent device, but the nature of the sounds it makes can tell a lot about its condition. A smooth, quiet hum of the compressor and a rare gurgling of the refrigerant in the tubes are considered normal, especially immediately after the engine is turned off.
The following sounds should cause alarm:
🔨 A loud knock or clanging sound when starting is a sign of worn bearings or problems with the starting relay.
📢 A prolonged whistle - may indicate a freon leak or fan operation in the No Frost system.
🌊 Strong gurgling and gurgling - often indicates a lack of refrigerant in the system.
Check the stability of the unit. If the refrigerator is not level, vibration from the operating compressor is transmitted to the floor and intensified. Rock the body: it should not sway. If necessary, tighten the adjustable feet on the bottom of the device.
⚠️ Attention: If you hear a loud electrical crack or see sparking inside the housing, immediately unplug the device from the electrical outlet. Further operation may result in a fire or electric shock.
In models with the system No Frost you may periodically hear the crackling of plastic when the temperature changes or the sound of a running fan. This is normal as long as the sounds do not become constant and too loud.
Why does the refrigerator crack after it is turned off?
Crackling and clicking noises after the compressor stops are often caused by thermal expansion or contraction of the plastic parts of the case and internal panels. This is a physical process that does not require repair, unless the sounds are accompanied by other symptoms of a breakdown.
Checking the electrical part and start relay
If the refrigerator does not turn on or the machine in the panel knocks out, the problem may lie in the electrics. First of all, check the integrity of the power cord and plug. There should be no traces of melting, kinks or damage to the insulation.
For deeper diagnostics, you will need a multimeter. With its help, you can check the integrity of the defrost heating element (in No Frost models) or the resistance of the compressor windings. However, these actions require caution and basic knowledge of electrical engineering. Before any manipulations inside the case, be sure to turn off the power.
A frequent cause of startup failure is the start relay. It is located on the side of the compressor. If you hear a click when you turn on the refrigerator, the motor tries to start, hums for a couple of seconds and clicks again, turning off - most likely the relay or the compressor itself requires replacement.
Defrost system in No Frost refrigerators
Owners of equipment with the system No Frost they may encounter a problem when the refrigerator is humming, the light is on, but there is no cold. Often the reason lies in a malfunction of the defrost system. The evaporator becomes overgrown with ice, the fan stops moving air, and cooling stops.
You can check this hypothesis by completely defrosting the unit. Unplug the refrigerator, open the doors and leave it for at least 12-24 hours. It is important that all the ice inside, including hidden cavities, has time to melt. If, after turning on, the refrigerator works normally and keeps the cold for several days, and then stops again, the problem is confirmed.
Faulty elements can be:
🔥 Defrost heating element (burnt out).
🌡️ Defrost sensor (does not give a command to turn on heating).
🕰️ Timer or electronic control module (does not switch modes).
⚠️ Attention: Do not use sharp objects (knives, screwdrivers) to chip ice inside the chamber. You can damage the evaporator or break the freon tubes, which will lead to expensive repairs or complete disposal of the equipment.
To accurately determine the burnt element, you will need to “ring” them with a multimeter for the presence of resistance. If the heating element is intact, but does not heat when voltage is applied, check the control circuit.
Is it possible to use a refrigerator with a faulty defrost?
Short-term - yes, but this will lead to the formation of a huge lump of ice, which can damage the fan or door. In addition, the compressor will work for wear, trying to compensate for the lack of cold.
Frequently asked questions (FAQ)
Why does the refrigerator work constantly and does not turn off?
There may be several reasons: freon leak, compressor wear, damage to the door seal, too low room temperature (if the refrigerator is standing on an unheated loggia) or thermostat malfunction. If the temperature inside is normal, but the motor does not rest, this is the first sign of a refrigerant leak.
How to check if there is freon in the refrigerator?
Without a pressure gauge, it is impossible to accurately determine the pressure, but indirect signs of a leak: hot side walls (instead of warm), lack of cold when the compressor is running, black deposits on the filter-drier. Also, the location of the leak can often be found by oily stains.
Is it normal that the side walls of the refrigerator are hot?
Yes, this is normal for most modern models. In them, the capacitor (radiator) is built into the side walls of the case. They heat up when the compressor operates, releasing heat into the room. However, the walls should not be so hot that they are painful to touch.
What to do if water appears in the refrigerator?
Check the drainage hole in the back wall of the refrigerator compartment. It could become clogged with crumbs or mold. Clean it with a special brush or soft wire. Also check if the drainage tray above the compressor is frozen.