A sudden stop of the compressor or its characteristic hum without starting often indicates problems with the electrical circuit, in particular with the starting capacitor. In refrigerators Atlant this component plays a key role in providing the initial impulse for the engine. If you are faced with the fact that the unit has stopped cooling, but the light inside is on, and the motor is silent or makes clicking noises, the first thing you should consider is the possibility of failure of this particular part.
Diagnostics of the capacitor does not require deep knowledge in electronics, but requires care and compliance with safety measures. Starting device responsible for creating a phase shift, necessary to rotate the rotor of an asynchronous motor. Without a working element, the motor will not be able to overcome the inertia of rest. In this article, we will analyze an algorithm of actions that will help you accurately determine the condition of the part and make a decision about replacing it.
Before proceeding with disassembly, it is necessary to completely de-energize the refrigerator. Unplug the power cord and make sure the back wall is clear. Working with electrical components requires dry hands and no moisture on the floor. Atlant refrigerator has a standard connection diagram, which simplifies troubleshooting for the home technician.
Symptoms of a faulty starting capacitor
Understand what the problem is lies precisely in the capacitor, it is possible by indirect evidence even before opening the casing. Most often, owners notice that the compressor tries to start, makes a loud hum, but after a few seconds the relay clicks and the engine goes silent. This is a classic picture when starting torque it is not enough to start the rotor. In some cases, the motor may hum smoothly, but not start at all, overheating.
Another sign is cyclical operation: the unit turns on, runs for several minutes, then turns off via a thermal relay, and the cycle repeats. The food in the chamber begins to thaw, as complete cooling does not occur. If you hear a crackling sound or see sparking in the area of the compressor, this may indicate an insulation breakdown or swelling of the capacitor housing.
⚠️ Attention: If you smell burning or see melted plastic on the parts of the starting kit, further attempts to start without replacing the elements may lead to burning of the compressor windings. Do not ignore visual defects.
Sometimes a capacitor malfunction is accompanied by unstable operation of the electrical network at the connection point, but this happens less frequently. It is important to distinguish problems with the capacitor from a breakdown of the compressor itself or the start relay. Unlike a relay, which often clicks, capacitor usually silent, but its inoperability blocks the entire start process.
Dismantling and visual inspection of the part
For access to the capacitor in refrigerators Atlant you need to remove the rear protective cover at the bottom of the case. It is usually secured with latches or several screws. After removing the casing, you will see a compressor with a smaller plastic casing attached to the end. It is inside it that the starting relay and capacitor are located.
Carefully remove the plastic box by disconnecting the wires or releasing the clamps. The condenser is a black or gray cylinder, often enclosed in an additional plastic cup. A visual inspection can immediately answer the question of its condition. Look for the following signs:
- 💥 Blistering of the top of the cover or the bottom of the cylinder body.
- 🔥 Traces of soot, burning or melted insulation on the wires.
- 💧 Leakage of electrolyte or the presence of oily spots around the part.
- 🔌 Oxidation or breakage of contact terminals.
If you find any of these signs, the part definitely requires replacement. However, the absence of external defects does not guarantee serviceability. Internal lining breakage or loss of capacitance may occur without any visible change in appearance. Therefore, even if visually capacitor looks new, it must be checked with a device.
Necessary tools for diagnostics
For a quality check, you will need a minimum set of tools, which can be found in many home craftsmen. The main device is a multimeter (tester) capable of measuring resistance and capacitance. Without it, accurate diagnosis is impossible, since it is impossible to determine the loss of capacity “by eye.”
In addition to the multimeter, prepare pliers with insulated handles and a screwdriver. You will need pliers to carefully remove the terminals, and a screwdriver to remove the fasteners. It is also recommended to have dielectric-coated gloves on hand to prevent accidental electric shock from residual charge.
If you do not have a multimeter with a capacitance measurement function (indicated as Cx or F), you can only test for breakdown and open circuit in ohmmeter mode. However, this method is less accurate and will not show the real deviation of the capacity from the nominal value. For professional diagnostics, it is better to use a device with an appropriate measurement range.
Checking a capacitor with a multimeter: step-by-step instructions
Before starting measurements, you must discharge the capacitor so as not to damage the multimeter and to protect yourself. Close the contacts of the part with an insulated screwdriver or pliers. If a spark jumps, it means there was a charge. After this, you can begin measurements.
Set the multimeter in resistance measurement mode (Ohm) to the maximum limit (usually 2 MOhm). Touch the probes to the capacitor contacts. If the device shows one (infinity) right away, it means there is a break inside. If the value is zero or close to zero and does not change, there is a short circuit. The normal reaction of a working element: the resistance begins to increase from a low value to infinity.
For more accurate diagnostics, switch the device to the capacitance measurement mode. Connect the probes to the contacts and wait for stable readings. Compare the value obtained with the value indicated on the case. The permissible deviation is usually no more than 20-30% downwards. If the capacitance has dropped significantly lower, the engine will not receive a sufficient impulse to start.
☑️ Test algorithm with a multimeter
⚠️ Attention: When measuring capacitance, do not touch the metal parts of the probes and capacitor contacts with your hands. The human body has its own resistance, which can distort the readings of the device, especially at high measurement ranges.
If your device does not show a value or gives an error, the measurement range may not be sufficient for starting capacitor, the capacitance of which is usually from 10 to 50 μF. In this case, it is better to use another tester.
Correspondence table of parameters and markings
When selecting a replacement, it is important to know not only the geometric dimensions, but also the electrical characteristics. The capacitor body is marked with key data. Below is a table that helps to decipher the main parameters found in refrigerators Atlant.
| Parameter | Designation on the body | Normal value for Atlant | Influence on work |
|---|---|---|---|
| Capacity | μF or mF | 12 - 50 μF | Determines the strength of the starting torque |
| Voltage | V or VDC | 250 - 450 V | Safety margin against network surges |
| Tolerance | %, M, K | ±5%.. ±20% | Tolerable capacitance deviation |
| Temperature | °C | -40.. +85 °C | Operating range in the engine compartment |
When replacing, it is allowed to install a capacitor with a voltage higher than the standard one (for example, 450V instead of 250V), but in no case lower. The capacity can be changed within ±20%, but it is better to select an exact analogue. Using a part with a very different capacitance will result in overload of the windings or inability to start.
Pay attention to the temperature conditions. The engine compartment of the refrigerator can be hot, especially in summer. If you install a capacitor designed for low temperatures, it will quickly fail. Marking 85°C or 105°C is optimal for such operating conditions.
Replacement and checking the functionality of the system
Once the malfunction is confirmed and a new element is purchased, you can begin replacement. Install the new capacitor in place of the old one, securely fixing the terminals. Make sure that the wires are not stretched and do not touch hot parts of the compressor or sharp metal edges.
Assemble the protective casing and install the back cover of the refrigerator. Now you can connect the unit to the network. Pay attention to the nature of the start-up: the compressor should start smoothly, without prolonged buzzing or clicking. After 10-15 minutes of operation, check whether the evaporator inside the chamber begins to get colder.
What to do if the new condenser did not help?
If after replacing the condenser the refrigerator still does not start or hums, the problem may be deeper. The starting relay may be faulty (it is often replaced in conjunction with the capacitor), the compressor has jammed, or there has been a break in the motor windings. In such cases, professional diagnostics are required by measuring the resistance of the windings.
If the startup was successful, let the refrigerator operate for several hours without loading food. This will ensure the stability of operation and correct temperature conditions. Periodically check the temperature of the condenser body - it may become slightly warm, but should not be hot.
Common mistakes during self-repair
Home craftsmen often make typical mistakes that can lead to repeated breakdowns. One of the most common is ignoring the state of the start relay. If a relay is stuck or has burnt contacts, it can break through a new capacitor in a matter of seconds. Therefore, it is recommended to change this combination comprehensively.
Another mistake is using capacitors from other equipment, for example, from washing machines, without taking into account their characteristics. They may have a different terminal design or may not withstand compressor vibrations. It is also dangerous to leave the wires simply twisted without securely fixing them with terminals - vibration during operation of the refrigerator Atlant will quickly break the contact.
- 🚫 Trying to solder the capacitor directly in the air without removing it from the refrigerator (risk of overheating and damage to neighboring details).
- 🚫 Installing the part "twisted" without using standard terminals.
- 🚫 Ignoring checking the voltage in the network (at low voltage, even a working capacitor may not start the motor).
Be careful with “folk methods” of checking, such as connecting to the network through a light bulb. Without proper experience, you can easily get an electric shock or cause a short circuit. Modern refrigerator electronics are sensitive to surges, therefore multimeter remains the safest tool.
Is it possible to temporarily start a refrigerator without a condenser?
Theoretically, some types of engines can start with a push or when the shaft is turned, but for refrigerators Atlant this is impossible and extremely dangerous. Operation without a capacitor will lead to instant overheating of the starting winding and combustion of the compressor. Operation without this element is prohibited.
How often do you need to change the capacitor for preventive purposes?
There is no need to specially change a working capacitor. Its service life is usually 10-15 years or more. Preventive replacement only makes sense if you are replacing the compressor or start relay, and the old capacitor has significant wear or is close to its age limit.
Does room temperature affect the operation of the capacitor?
Yes, high ambient temperatures accelerate the degradation of the electrolyte inside the capacitor. If the refrigerator is placed near a radiator or in the sun, the service life of the part is reduced. Severe frosts are also critical if the refrigerator is on an unheated balcony - some types of capacitors lose capacity in the cold.
Why is the compressor humming after replacing the condenser?
If the humming has changed to smooth operation, but the noise remains, perhaps the problem is vibration of the tubes or the compressor itself (bearing wear). If the hum is intermittent and the motor does not start, check that the wires are connected correctly and that the capacity of the new part matches.