The situation when a refrigerator suddenly stops performing its direct functions always takes you by surprise. Food begins to spoil, water or ice appears on the shelves, and the temperature inside rises, threatening the entire food supply. Owners of units are often faced with the fact that the equipment works, but does not cool properly, or makes strange sounds that were not there before.
Understanding this why the refrigerator does not work wellis the first step to saving products and saving on expensive repairs. Often the problem lies not in a compressor failure, but in simple operating errors or a clogged drainage system. However, ignoring the primary symptoms can lead to failure of complex components, such as inverter compressor or the thermostat.
In this article we will analyze in detail the main reasons for the incorrect operation of refrigeration equipment. You will learn how to carry out initial diagnostics yourself, which components are checked first and when it is really necessary to call a specialist. It is important to distinguish normal operating modes from real malfunctions so as not to panic ahead of time.
Primary diagnostics: external factors and operating conditions
Before disassembling the back wall or calling a technician, it is necessary to exclude trivial causes. Often the question “why the refrigerator does not freeze well” is solved by simply checking the operating conditions. The unit is a complex mechanism that requires certain conditions for effective heat exchange.
One of the most common causes of overheating is incorrect installation. If the equipment is placed close to the wall or in a niche without gaps, heat is not removed from the condenser. This causes the compressor to work harder trying to reach the set temperature. It is also worth checking whether the refrigerator is located next to a heat source, for example, a radiator or stove.
⚠️ Attention: The minimum distance from the back of the refrigerator to the wall should be at least 5-7 cm for free air circulation. Ignoring this rule leads to overheating of the refrigerant.
Another important aspect is the tightness of the door. If the sealing rubber does not fit tightly, warm air constantly flows inside. This leads to the formation of ice on the rear wall and constant operation of the motor. Check that the seal is clean and free of cracks or creases.
- 🔍 Check that the refrigerator is level so that the door closes itself under the influence of gravity.
- 🌡️ Make sure that the room temperature does not exceed +30°C, otherwise the cooling efficiency will drop sharply.
- 🚪 Inspect the door hinges: if they are skewed, the seal of the chamber will be compromised.
- 🧊 Do not put hot foods inside, this creates an excess load on the system.
Problems with the defrosting system and ice formation
If you notice that a “coat” of ice is growing on the back wall of the refrigerator compartment, and the food in the freezer is covered with frost, then the defrosting cycle is broken. In modern models with a system No Frost or Low Frost a special timer, heating element and defrost sensor are responsible for defrosting the evaporator.
When one of these elements fails, the ice does not melt, but builds up layer by layer. The ice block ends up blocking the cold air circulation channels. As a result, it becomes warm in the main chamber, and too cold in the freezer, but without normal circulation.
Diagnostics of the defrost system requires a multimeter. It is necessary to “ring” the heating element for a break and check the resistance of the sensor. Often the problem lies precisely in a burnt-out heating element, which stops heating the evaporator at the right moment in the cycle.
| Symptom | Possible cause | Required action |
|---|---|---|
| Ice on the back wall | Faulty defrost heating element | Replacing the heater |
| Water on the floor | Drain hole clogged | Cleaning the tube |
| The refrigerator is not turns off | Heat transfer is disrupted | Defrosting and checking the seal |
| Frost on food | Leaky door | Adjusting hinges or replacing rubber band |
☑️ Actions when ice is detected
It is important to note that models from different manufacturers have algorithms defrosts may vary. For example, in refrigerators Indesit or Ariston the defrost sensor often fails, and in LG and Samsung problems may be associated with the electronic control module.
Malfunctions of the compressor and starting relay
The compressor is the heart of the refrigerator. If it does not work correctly, the unit either does not freeze at all or works intermittently. A characteristic sign of starting problems is a click, after which the motor hums for several seconds and then goes silent.
Most often the culprit is the starting relay. This is a small plastic element that fits onto the compressor rod. Inside it there is a coil or posistor, which wears out over time. Replacing a relay is a simple procedure that you can perform yourself by choosing an analogue according to the marking.
⚠️ Attention: If after replacing the relay the situation has not changed and the compressor still hums and turns off, there may be a wedge in the compressor itself or an interturn short circuit in the winding.
Modern ones inverter compressors are quieter and more economical, but their diagnostics are more difficult. They do not emit characteristic clicks when starting, but smoothly gain momentum. If such a compressor fails, it is often necessary to replace the entire assembly along with the control module.
What is a compressor “wedge”?
A compressor wedge is a mechanical blocking of the moving parts of the motor. Pistons get stuck in the cylinders due to exhaustion, lack of lubrication or foreign objects. It is impossible to start a jammed motor using conventional methods; professional repair or replacement of the unit is required.
When replacing a compressor or relay, be sure to check the condition of the capacitor. If it is swollen or has traces of oxidation, it should also be replaced, since it is responsible for creating the starting torque.
Freon leakage: signs and consequences
Freon is a refrigerant that circulates through a system of tubes and transfers heat. If a microcrack appears in the circuit, the gas gradually evaporates. The refrigerator begins to work worse, trying to compensate for the lack of refrigerant by constantly running the motor.
The main sign of a leak is weak cold or its complete absence when the compressor is running. In this case, the motor itself may be hot, and the condenser (grid at the back) may be barely warm or cold. You can sometimes notice oily spots at the leak site, since freon circulates along with compressor oil.
It is impossible to find the leak and refill the refrigerator yourself. This requires special equipment: a leak detector, a vacuum pump and a pressure gauge station. The technician first finds the location of the damage, seals it, vacuums the system and only then fills in a new volume of freon strictly by weight.
- 💨 If freon leaks, the refrigerator can work around the clock without shutting down.
- 🧊 Ice may appear in the freezer only at the evaporator outlet, and the rest will be warm.
- 🔊 The compressor may operate louder than usual due to increased load.
Attempts to add freon "by eye" or without eliminating the leak will only lead to a temporary effect and eventual failure of the compressor due to running dry or with incorrect pressure.
Clogged capillary tube and filter-drier
The capillary tube is the thinnest channel in which throttling (sharp expansion) of freon occurs, which causes cooling. The diameter of this channel is so small that even a microscopic particle of debris or a frozen paraffin plug can completely block the flow of refrigerant.
A blockage is often accompanied by unusual behavior of the refrigerator: it freezes, then stops, the compressor overheats. If the filter drier, which is located in front of the capillary tube, becomes clogged, the system loses efficiency. The filter retains moisture and contaminants, but over time it itself becomes an obstacle to flow.
To eliminate this problem you need:
1. Cut off the capillary tube and filter.
2. Purge the system with nitrogen under high pressure.
3. Replace the filter drier with a new one.
4. Solder the tubes and fill the system with freon.
This procedure is a complex repair and requires a skilled technician. At home, you can only try to defrost the refrigerator during the day so that the ice plug (if it has formed from moisture) melts, but this does not guarantee a solution to the problem.
Faults in electronics and thermostat
In older models, a mechanical thermostat is responsible for the temperature. This is a simple “twist” with a bellows that reacts to gas expansion. If the bellows has lost its seal or the contacts are burnt, the compressor may not turn on at all or may work without stopping.
In modern refrigerators, everything is controlled by an electronic module. It receives signals from several temperature sensors located in different zones. If one of the sensors lies (shows the wrong temperature), the module commands the compressor to work incorrectly. For example, the sensor may “report” that it is already -10°C in the chamber, although it is +5°C there, and the motor will turn off.
⚠️ Attention: Power surges in the network often damage electronic control modules. It is recommended to connect refrigerators through a voltage stabilizer or surge protectors with protection.
Electronics diagnostics are carried out by measuring the resistance of the sensors at different temperatures and comparing the readings with a table of ratings. Electronic modules often have a self-diagnosis function: an error code can be displayed on the display or signaled by blinking indicators.
Noise, vibration and extraneous sounds
A well-functioning refrigerator emits a uniform low hum. However, the appearance of new sounds - whistling, knocking, gurgling or crackling - indicates problems. Gurgling and fluid sloshing is usually normal (freon movement), but if it becomes too loud, there may be air in the system.
Knocks and vibrations are often caused by improper installation. Check whether the refrigerator is touching walls, furniture or pipes. Fans in the system can also be a source of noise. If ice or dirt gets into them, a characteristic cracking sound appears. No Frost. If ice or dirt gets into them, a characteristic cracking sound appears.
A sharp knock when turning the compressor on or off may indicate problems with the shock absorbers on which the motor is suspended. If the rubber bushings are dry, the vibration is transmitted to the housing, creating a lot of noise.
- 🔊 A whistle may indicate a freon leak at the soldering site.
- 🔨 The knocking of the pistons indicates serious wear on the compressor.
- 🌪️ The hum of a fan is often associated with freezing of its blades.
FAQ: Frequently asked questions
Why does the refrigerator work, but does not freeze after defrosting?
If after complete defrosting (more than 24 hours) the refrigerator turned on, worked and stopped freezing, most likely there was a freon leak or a blockage has formed in the capillary system. Oxidation of the contacts of the start relay is also possible.
Is it possible to operate the refrigerator if it is standing crookedly?
It is strictly not recommended. The distortion disrupts the operation of the compressor (oil may not return to the crankcase) and prevents the door from sealing tightly, which leads to loss of cold and ice formation.
How often do you need to change the sealing gum?
The service life of the seal is about 5-7 years. However, it must be changed as soon as it has lost its elasticity, cracked, or has ceased to provide airtightness, even if a shorter period has passed.
Why is the back wall of the refrigerator covered with ice?
In drip systems, this is a normal operating process: moisture condenses and freezes, and then drains during defrosting. If the ice does not melt and a “fur coat” grows, it means that the defrosting system (heating element, sensor or timer) is faulty or the door seal is broken.