In modern refrigeration technology, be it classic Atlant, noisy Indesit or modern LG with an inverter compressor, each unit performs a critical function. Condenser in this system it is one of the key elements, without which full cooling of products will become impossible. Many users confuse this component with a heat exchanger (radiator) due to the similarity of names, but in the electrical circuit these are completely different parts with unique tasks.
If your refrigerator stops turning on, it hums, but does not start, or the compressor clicks and immediately goes silent, there is a high probability of failure of the starting capacitor. Understanding refrigerator capacitor what is it and what role it plays in the electrical circuit will help you make the right decision: try to replace the part yourself or call a technician. In this article we will analyze in detail the device, principles of operation and diagnostic methods.
Main purpose and principle of operation
In the electrical circuit of a household refrigerator, the capacitor acts as a storage device for electrical energy and its instant release at the right time. Starting capacitor necessary to create a phase shift in the compressor motor windings. Without this phase shift, a single-phase electric motor installed in most household units simply will not be able to start rotating, since the magnetic field will not be rotating.
When the refrigerator is turned on, the capacitor accumulates a charge and abruptly transfers it to the starting winding of the motor. This creates the necessary torque, allowing the piston group to overcome the inertia and freon pressure in the system. As soon as the engine reaches rated speed (usually in 1-3 seconds), the relay opens the starting winding circuit, and the compressor continues to operate on the main winding.
⚠️ Attention: An attempt to start the compressor without a working capacitor or with shorted contacts can lead to overheating of the windings and irreversible failure of an expensive motor.
There is also working capacitorwhich remains connected in the circuit constantly. It is used less frequently, mainly in powerful industrial models or specific circuits where it is necessary to improve the shape of the magnetic field during operation. In household models, it is most often the starting circuit with a short-term connection that is found.
Design features and types of devices
Externally, this the element is a compact cylinder or rectangular block enclosed in a metal or plastic housing. Inside there are two plates separated by a dielectric. For refrigeration equipment, electrolytic or film types of devices are most often used, capable of withstanding high load currents at the time of start-up.
The main technical characteristics that you need to pay attention to when selecting an analogue include:
- 🔋 Capacity (measured in microfarads, μF) - must exactly match the requirements of the engine.
- ⚡ Rated voltage - must be equal to or exceed the mains voltage (usually 250V, 450V or 500V).
- 🌡️ Temperature range - ability to work under conditions of vibration and temperature changes.
- 📐 Dimensions - are important for installation in a limited compressor compartment.
It is important to note that in modern inverter refrigerators brands Samsung or Bosch a classic starting capacitor may be missing. In such systems, the motor is started and controlled by a complex electronic module (inverter), which generates the required frequency and phase of the current in software.
If you are planning a replacement, always check the markings on the body of the old part. Using an element with a lower capacity will not allow the compressor to start, and installing a part with an excessively high capacity will lead to overheating of the windings and shortening the service life of the unit.
Is it possible to use a capacitor with a larger capacity?
Theoretically, a deviation of the capacitance towards an increase of up to 20% is acceptable in emergency cases, but this reduces the reliability of the system. It is strictly forbidden to reduce the capacity - the motor will not start.
Typical signs of malfunction and diagnostics
It is possible to determine that the refrigerator capacitor has failed by a number of indirect signs that appear in the behavior of the equipment. Most often the problem lies in a loss of capacitance or an internal break/short circuit. Diagnostics does not always require complex equipment; sometimes a visual inspection and careful analysis of symptoms are enough.
The most common symptoms of a malfunction:
- 🔊 The compressor hums for 3-5 seconds, then the relay clicks and the motor stops.
- ❄️ The refrigerator does not cools, although the light inside is on.
- 🔥 Strong heating of the compressor housing when the motor is not running.
- 💥 Swelling or darkening of the condenser housing itself.
A multimeter is needed for an accurate check. Before starting work, be sure to disconnect the refrigerator from the power supply! Remove the protective cover from the compressor and disconnect the wires from the condenser. Switch the device to the mode of measuring resistance (Ohm) or checking diodes.
If the part is working, the arrow or numbers on the screen should first show low resistance (charging), and then increase indefinitely (discharging). If the device shows zero, a short circuit has occurred; if it immediately shows infinity, there is an internal break. In both cases, replacement is required.
☑️ Condenser diagnostics
Instructions for replacing the part yourself
Replacing the starting capacitor falls into the category of simple repairs that you can do with your own hands if you have basic skills and tools. The main rule is safety. Make sure that the power cord is removed from the outlet and there is no residual voltage in the system.
The replacement process is as follows:
- Remove the plastic or metal casing covering the compressor assembly.
- Locate the start relay and the capacitor attached to it (often they are in the same block).
- Take a photo of the wire connection diagram so as not to confuse the contacts during assembly.
- Disconnect the terminals and remove the faulty part from the fastening tabs.
- Install a new element with similar characteristics and connect the wires according to the diagram.
After installation, do not rush to close the casing. Plug in the refrigerator and listen to it start. The compressor should operate smoothly, without humming or repeated clicks. If the startup was successful, let the unit operate for 15-20 minutes, monitoring the temperature of the motor housing.
⚠️ Attention: Do not touch the capacitor terminals immediately after turning off the device. It may retain a residual electrical charge that can cause an unpleasant electric shock.
Comparison of characteristics: original and analogues
When searching for spare parts on the market, you can come across a huge variety of brands. Is it worth overpaying for the original from Whirlpool or Electrolux, or can you take a universal analogue? The table below will help you understand the key differences.
| Parameter | Original part | Universal analogue | Chinese replicant |
|---|---|---|---|
| Capacity accuracy | High (±5%) | Average (±10-20%) | Low (up to ±30%) |
| Service life | 10+ years | 5-7 years | 1-3 years |
| Thermal resistance | Up to 85°C | Up to 70°C | Up to 60°C |
| Price | High | Medium | Low |
Using high-quality analogues from proven electronics manufacturers (for example, CBB60, CBB61) is often the optimal solution. They are cheaper than the originals, but provide stable operation. Cheap, nameless options can lead to repeated breakdowns in six months.
It is important to consider that the operating conditions in the compressor niche are quite harsh: high temperature, vibration and possible moisture ingress during defrosting. Therefore, saving on such an important detail as starting capacitoris not always justified.
The influence of external factors on the service life
The service life of the capacitor depends not only on its quality, but also on the operating conditions of the refrigerator. Frequent power surges are the main enemy of electronic components. Voltage surges can pierce the dielectric, which will lead to instant failure.
Overheating also has a negative effect. If the refrigerator is close to the wall and the rear grill is clogged with dust and animal hair, the temperature in the compressor area will rise. This accelerates the aging of the electrolyte inside the capacitor, it dries out and loses capacity. Regular cleaning behind the refrigerator prolongs the life of all components.
In rare cases, the cause of a breakdown is a malfunction of the compressor itself. If the motor “jams” mechanically, the starting currents increase many times over, which leads to overload and destruction of the starting element. Therefore, before replacing, you should always make sure that the motor shaft rotates freely (with the power off).
⚠️ Attention: If after replacing the capacitor the situation repeats after a short time, the problem may be deeper - in the motor windings or the mechanical part of the compressor. Diagnostics by a specialist is required.
Frequently asked questions (FAQ)
Is it possible to start a refrigerator without a capacitor?
No, in most models with an asynchronous motor, starting without a starting capacitor is impossible. The engine will only hum, trying to move, which will quickly lead to its combustion. In inverter models, the starting function is performed by an electronic board.
Why did the capacitor swell and burst?
Swelling indicates an excess of internal pressure due to overheating or a power surge. This is a protective reaction of the body that prevents fire. Often the reason is that the starting winding is kept energized for a long time due to sticking of the relay.
How to select a capacitance if the markings have been erased?
It is difficult to determine the exact capacitance without markings. You can focus on the power of the compressor: for low powers (up to 200 W) they usually take 4-6 μF, for medium powers (200-400 W) - 10-15 μF, for powerful ones - 20-30 μF. It is better to find the compressor model on the Internet and look at the specifications.
Is it dangerous to change the capacitor yourself?
If you follow the safety rules (disconnect from the network), the procedure is not dangerous. The only risk is the residual charge, which can be removed by closing the contacts with an insulated tool, or natural discharge in a few minutes.
What is the difference between the starting and working capacitor?
The starting capacitor is turned on only at the moment of start (2-3 seconds) and has a large capacity. The worker is constantly in the circuit, helping the engine work more efficiently, and has a lower capacity. In household refrigerators, only the starter is often used.