Sudden failure of refrigeration equipment often becomes an unpleasant surprise that disrupts the usual way of life. Products begin to deteriorate, and the wait for a repairman can take several days. It is at such moments that many owners think about the possibility of eliminating the malfunction on their own. Refrigerator repair The process is complex, but if you have basic technical knowledge and tools, it is quite feasible at home.
Before taking active steps, it is necessary to carry out an initial diagnosis. Often the cause of a breakdown is trivial things: a broken power cord, a faulty socket or tripped power surge protection. Modern models Electronics can block the start of the compressor when the power supply is unstable, requiring a complete disconnection from the network for 15-20 minutes to reset the errors.
It is important to understand that that not all types of work can be performed without special equipment and a license. Self-filling with freon without evacuation of the system is strictly prohibited, as this leads to rapid failure of the unit. Our goal is to consider those 70% of faults that can be repaired with your own hands using a standard set of tools.
Primary diagnostics and checking the electrical circuit
Any repair begins with checking the presence of voltage. If the refrigerator is silent and does not make any sounds, you should check the integrity of the power cord and plug. Visual inspection may reveal melting or mechanical damage to the insulation. If such defects are detected, replacing the cable is the first thing to do.
Next you should check the thermostat. This device is responsible for turning the compressor on and off depending on the temperature inside the chambers. To diagnose a thermostat, you need to “close” it by connecting the contacts directly, bypassing the sensor itself. If after this procedure the compressor starts, then the problem lies in the thermostat.
⚠️ Attention: Before any manipulations with electrical components, be sure to unplug the refrigerator! Electric shock can be fatal, and capacitors can retain a charge even after being turned off.
Testing the start relay is also an important step. This small element is responsible for starting the compressor engine. If the relay is burned out or stuck, the engine will not be able to start, producing only a humming or clicking sound. Remove the relay, shake it: if you hear the knocking of the ball inside, the mechanism is destroyed and requires replacement.
Diagnostics and replacement of the thermostat
Thermostat is a mechanical or electronic sensor that controls the temperature. If the refrigerator stops turning off and freezes food, or, conversely, does not turn on the compressor to defrost the contents, suspect this particular unit. In models with mechanical control, the check is carried out by elimination.
To replace it, you must dismantle the old sensor. It is usually located inside the chamber or behind a plastic panel. Capillary tube The thermostat must be carefully removed from the evaporator so as not to damage it. The new device must have similar markings, since the temperature response ranges for different models may differ.
Installation of the new thermostat is done in the reverse order. The capillary tube must be secured in its original location, ensuring tight contact with the surface of the evaporator. After assembly, check the operation of the unit: when the set temperature is reached, the compressor should turn off.
In electronic models, instead of a thermostat, thermal sensoris used, which is connected to the control board. It is checked with a multimeter: the resistance of the sensor should change depending on the temperature. If the resistance is constant or equal to zero/infinity, the sensor is faulty.
Problems with the compressor and start relay
The compressor is the “heart” of the refrigerator, creating pressure for the circulation of the refrigerant. If the motor hums but does not start, or starts for a few seconds and turns off with a click, the problem most often lies in the start-up relay or motor windings.
Replacing the relay is a simple procedure. Remove the cardboard or plastic casing from the back of the refrigerator, disconnect the wires and remove the relay from the compressor contacts. Install the new relay, making sure it clicks into place. It is important to correctly orient the relay according to the arrows or the “Up” marking.
If replacing the relay did not help, and the compressor still does not start or gets red hot, there may be a breakdown of the winding or a mechanical wedge of the piston group. In the event of a breakdown of the winding (short circuit to the housing), further operation is dangerous. Interturn short circuit often leads to the operation of circuit breakers in the panel.
⚠️ Attention: If the compressor has traces of oil around the tubes or looks skewed, Perhaps the rod has come off or the gasket has broken down. In such cases, it is necessary to replace the entire unit, which is not always economically feasible.
Why does the new compressor hum?
The hum can be caused by improper installation (tubes touching the housing), vibration of the floor, or a defect in the motor itself. Also, a hum often occurs when operating at maximum loads in a hot room.
Fixing leaks and replacing the filter-drier
If the refrigerator operates constantly without turning off, but the temperature in the chambers does not drop below +10...+15 degrees, there is a high probability of a refrigerant leak. Freon can escape through microcracks in the evaporator, often hidden by a foaming agent, or through solder joints.
To detect leaks at home, you can use a soap solution. Apply it to suspicious areas of the circuit (usually connections or visible parts of the evaporator). The appearance of inflating bubbles will indicate where the gas is escaping. However, if the leak is in the foamed part of the body, independent repair is impossible without opening the thermal insulation.
When eliminating the leak, replacement is required filter-drier. This element removes moisture from the system, which inevitably gets there during depressurization. If the filter is not replaced, moisture will freeze in the capillary tube, forming an ice plug, which will lead to a complete stop of circulation.
| Type of malfunction | Symptom | Required actions |
|---|---|---|
| Freon leak | The refrigerator does not freeze, the condenser is cold | Looking for leaks, soldering, vacuuming, refilling |
| Capillary clogged | The compressor is hot, the condenser is heating up partially | Blowing with nitrogen, replacing the filter |
| Faulty heating element | Ice in the chamber, water on the floor | Ringing heating element, replacing element |
| Wear seal | Increasing “fur coat”, warm air outside | Adjusting the door or replacing the rubber band |
Repairing the defrost system (No Frost)
In refrigerators with the system No Frost (often found problem) - ice freezing on the evaporator inside the rear wall. This occurs due to a malfunction in the defrost system. Symptoms: weak cold in the main chamber, strong fan noise (which touches the ice), lack of cold in the freezer.
The defrosting system consists of three main elements: a heating element (heater), a defrost sensor and a timer (or electronic module). To diagnose, you need to defrost the refrigerator for 24 hours by removing the back panel in the freezer compartment. Visually assess the condition of the evaporator.
The check begins with the defrost heating element. Test it with a multimeter: the resistance should be within normal limits (usually several hundred ohms). If the device shows a break, the heater has burned out and requires replacement. Also check the defrost sensor - at room temperature it should be closed (or open, depending on the model), and change state when cooling.
☑️ Diagnostics No Frost
Often the reason for stopping defrosting is a simple clogging of the drainage hole through which water flows into the tray above the compressor. Clean the channel with hot water or soft wire. Water stagnation in the evaporator pan can lead to re-freezing of the system.
Replacing sealing rubber and adjusting doors
Tight fit of doors is the key to effective operation refrigerator. If the seal (cuff) is worn out, cracked or has lost elasticity, warm, moist air enters the chamber. This leads to the formation of condensation, ice freezing and increased load on the compressor.
You can check the tightness using a sheet of paper. Clamp the sheet with the door around the perimeter: it should be removed with noticeable force. If the paper slides freely, the seal needs to be replaced or restored. You can try to revive the old rubber by heating it with a hairdryer or soaking it in boiling water, but this is a temporary measure.
The seal is replaced by installing a new tape in the groove of the door. In some models, the rubber is glued or screwed with self-tapping screws. After installation, the door may not close tightly immediately - allow the material to straighten out within 24 hours.
⚠️ Attention: When installing a new seal, make sure that it is not stretched or compressed. Incorrect installation will lead to a loose fit and rapid wear of the new part.
Elimination of extraneous noise and vibration
Noisy operation of the refrigerator can be annoying and indicate hidden problems. If the unit begins to hum louder than usual, check its installation. The legs should rest firmly on the floor, ensuring a horizontal position of the body. Use a building level to check.
Often the source of noise is the condenser tubes on the rear wall, which can vibrate and touch each other or the housing. Gently bend the tubes by hand (with the device turned off!), increasing the gap between them. Also check the water collection tray above the compressor - it may be rattling.
If the noise is coming from inside the freezer, there may be a problem with the fan. In No Frost systems, fan bearings wear out over time, causing a hum or whistle. In this case, lubrication or replacement of the fan is required.
Frequently asked questions (FAQ)
Is it possible to replace the compressor with an analogue one? from another manufacturer?
Yes, replacement is possible if the mounting dimensions, power and type of refrigerant are the same. However, it is better to install original spare parts or certified analogues recommended by the manufacturer in order to avoid problems with the compatibility of the starting equipment.
Why does the refrigerator click but does not turn on?
The starting relay usually makes clicking noises when trying to start the compressor. If startup does not occur, the reason may be a malfunction of the relay itself, a break in the motor winding, or low voltage in the network.
How often do you need to defrost a No Frost refrigerator?
The No Frost system does not require regular defrosting to remove ice, as this happens automatically. However, it is recommended to carry out preventive defrosting and washing 1-2 times a year for hygiene and cleaning of drainage channels.
Is it dangerous to repair a refrigerator yourself?
Repairing electrical parts and mechanical components when the power is turned off is safe if safety precautions are followed. The only danger is the refrigerant circulation circuit (high pressure and toxicity of some gases) and high voltage in the control units.