A refrigerator breakdown is always stressful for the owners, because food supplies are at risk, and calling a technician and waiting for spare parts can take days. However, do not despair ahead of time: many malfunctions, such as leakage or failure of the thermostat, can be easily eliminated on your own if you have a basic set of tools and strictly adhere to safety precautions.
Before taking active steps, it is necessary to carry out an initial diagnosis to understand whether the problem lies in the electrical system, the refrigerant circulation system or mechanical damage. DIY Repair justified in cases when it comes to replacing consumables, removing blockages or adjusting sensors, but if you hear a loud knock of the motor or see swelling of the walls, it is better not to risk it.
In this article we will analyze in detail the algorithms of action for the most common breakdowns that occur in models brands Indesit, Atlant and Samsung. A competent approach to diagnostics will allow you to save a significant amount on the services of a service center.
Primary diagnostics and checking the power supply
Any repair begins with checking the most obvious thing: whether electricity is supplied to the unit. Often, users panic when they discover defrosted food, although the problem can be solved by replacing the socket or checking the plug. If the indicators on the control panel do not light up and the motor is silent, take a multimeter and test the power cord for breaks.
In situations where the refrigerator turns on, but after a while turns off again, you should pay attention to the state of the start relay. This small element is responsible for starting the engine, and its sticking or burnt out contacts are a common reason for the “silence” of the compressor.
⚠️ Attention: Before opening the case in any way, be sure to disconnect the refrigerator from the power supply! Working with live electrical appliances is deadly.
Also check the integrity of the light bulb inside the camera. If the light does not light up when you open the door, this may indicate not only a burnt-out light bulb, but also a malfunction of the limit switch - a switch that is activated when the door is opened.
To accurately determine the problem, use the following algorithm:
- 🔌 Check the voltage in the socket using another device.
- 🔍 Inspect the power cord for kinks, melts or signs of rodents.
- 👂 Listen: is there a quiet hum or click when you try to turn it on?
Replacing the thermostat and adjusting the temperature
If the refrigerator runs endlessly without turning off, or, conversely, does not start at all, although there is heat inside, most likely it has failed thermostat. This sensor monitors the temperature in the chamber and commands the compressor to turn on or off. In models with mechanical control, it looks like a knob with numbers, and in electronic ones - like a hidden sensor.
To replace it, you need to remove the regulator knob, unscrew the fixing nuts and carefully remove the bellows tube from the evaporator. When installing a new element, it is important not to damage the tube and seat it correctly in its original place, otherwise the temperature readings will be incorrect.
In electronic models LG or Bosch a thermistor is used instead of a mechanical relay. Its resistance changes depending on the temperature, and you can check it with a multimeter. If the readings of the device do not change when the sensor is heated or cooled, it must be replaced.
Common mistakes when replacing a thermostat:
- ❌ Incorrect installation bellows tube (insufficient contact with the evaporator).
- ❌ Use of an unsuitable analogue with other temperature thresholds.
- ❌ Damage to wire insulation during installation.
Repair of the No Frost system: heating elements and defrost sensors
Owners of units with the system No Frost often face the problem of “fur coat” growth on the back wall or in the air ducts, which leads to the cessation of cold air circulation. The main reason is the failure of the defrost system, which consists of a heater (heating element), a defrost sensor and a timer or electronic module.
For diagnostics, you need to defrost the refrigerator for 24 hours. If, after complete defrosting, it started working normally, but a week later the problem recurred, it means the heating element does not turn on. You can check the heater with a multimeter in continuity mode: if the circuit is broken, the heating element must be replaced.
The defrost sensor, which must inform the module when a certain temperature has been reached to turn off the heater, also often breaks. If it is “stuck” in the open state, heating will never begin.
How to check the heating element without a multimeter?
You can carefully apply 220V voltage to the contacts of the heating element (being extremely careful!) and see if it starts to heat up. However, using a tester is more reliable and safer.
The main symptoms of a defrost system malfunction:
- 🧊 Ice build-up blocks the air supply channels.
- 🌡️ The temperature in the refrigerator compartment is above normal, in the freezer it is normal.
- 🔊 You can hear the cracking of ice when the fan is running.
Replacing the seal and restoring the tightness
A tight fit of the door is the key to efficient operation of the refrigerator. If the rubber seal lost elasticity, is torn or is simply dirty, warm air gets inside the chamber, causing increased condensation and ice freezing. You can check the tightness using a sheet of paper: clamp it with the door and try to pull it out; if the sheet comes out too easily, the seal is broken.
You can restore the properties of rubber by heating it with a hot hairdryer or pouring boiling water over it - this will straighten out the deformed areas. However, if the material is cracked, only a complete replacement will help. Remove the old seal, degrease the seat and install a new tape, starting from the corners.
When installing a new seal, it is important to ensure that it lies flat, without creases. In some models Stinol or Turk the seal is glued, in others it is fixed in a special groove.
⚠️ Attention: Do not use aggressive chemicals to clean the seal, as it can destroy the structure rubber. Use a warm soapy solution.
After replacement, the door may not close tightly - this is normal. After a couple of days, the rubber will “sit” in place, and the force will return to normal.
Diagnostics and replacement of the compressor start relay
The compressor is the heart of the refrigerator, and if it does not start, makes a hum and clicks, the problem often lies in the start relay. This device protects the motor from overloads and helps it start. Inside the relay there is a coil and contacts, which can burn or stick over time.
Removing the relay is not difficult: it is located in a black casing at the back of the unit, on the compressor housing. Simply remove the terminals and carefully pull the part down. Shake the relay: if a ringing sound is heard inside (as if from broken glass), it means that the posistor or mechanical switch is damaged.
When buying a new relay, pay attention to the brand of the compressor (for example, Secop, Embraco, Danfoss) and its power. Universal relays are not always suitable and can shorten the life of the motor.
☑️ Replacing the start relay
If after replacing the relay the compressor hums but does not start, the motor itself may have jammed or compression has dropped. In this case, independent repair is almost impossible without special equipment.
Comparison table of common faults
To quickly navigate the symptoms and possible causes of breakdowns, use the following table. It will help narrow down the troubleshooting.
| Symptom | Probable cause | Difficulty of repair | Required tools |
|---|---|---|---|
| The refrigerator does not turn on | Open circuit, burnt relay | Low | Multimeter, screwdriver |
| Ice builds up in No Frost | Faulty heating element or sensor | Medium | Hair dryer, multimeter |
| Motor running constantly | Freon leak, thermostat | High | Manometer, soldering iron |
| Water under the refrigerator | Clogged drainage, torn seal | Low | Brush, wire |
As can be seen from the table, many problems can be solved at home conditions. However, if you are faced with a freon leak (this a gaseous substance without color and odor, but with a characteristic chemical taste at high concentrations), you will need to call a specialist with equipment to vacuum and refill the system.
Do not try to solder the circuit tubes yourself without skills and nitrogen - this may lead to a fire or complete failure of the unit.
Cleaning the drainage system and eliminating moisture
The appearance of a puddle under the refrigerator or inside on the floor of the chamber is often associated with a clogged drainage hole. Through it, the condensate flows into a special container on the back wall, from where it evaporates. If the hole is clogged with crumbs or mold, the water begins to overflow.
To clean, use soft wire, a brush or a medical bulb with warm water. Carefully insert the tool into the hole (usually located at the bottom of the rear wall of the refrigerator) and rinse several times.
Also check the integrity of the water collection tray above the compressor. If it is cracked from time or overheating, the body or floor itself will collect water.
After cleaning, be sure to wipe the camera dry and check the operation of the system within 24 hours.
Frequently asked questions questions (FAQ)
Is it possible to replace the compressor yourself?
Theoretically, yes, if you have the skills to work with a blowtorch, a vacuum pump and a cylinder of freon. However, for the average user this is too complex and dangerous a process that requires a license to work with refrigerants.
Why does the refrigerator crack or click?
Single clicks are normal (the operation of the thermostat or thermal expansion of the plastic). If the crackling noise is constant and loud, the fan may be faulty or the compressor is overloaded.
How often should you defrost a No Frost refrigerator?
The system No Frost does not require regular defrosting to remove ice, but once a year it is recommended to turn off the unit for washing and disinfection to remove bacteria and odors.
What to do if the smell in the refrigerator does not disappear after washing?
Use activated carbon, special odor absorbers or a bowl of soda. Also check the drainage hole - often the source of the smell (mold) is located there.