The question of how many capacitors are in the refrigerator often arises among owners of household appliances who are faced with problems starting the compressor or power outages. The number of these elements directly depends on the type of engine installed, the age of the model and the presence of additional electronic control units. In classic Soviet and early imported models, the circuit was simplified as much as possible, while modern inverter units may not have traditional starting capacitors at all in the usual sense.
Understanding the structure of the refrigeration machine is necessary for correct diagnosis. If your refrigerator hums but does not start, or, conversely, the motor is overheating, the reason often lies precisely in starting relay or working capacitor. In this article, we will analyze in detail where to look for these parts, how they differ and how to determine their quantity in your particular case, so that you can competently plan the repair.
Dependence of the quantity on the type of compressor
The main factor is The type of compressor installed determines the number of capacitors. In older models that use induction motors with a starting winding, the circuit always includes a starting device. Most often this is start-protection relay, inside of which there may be a capacitor, or a separate capacitor connected in parallel with the starting winding to create a phase shift. Such units usually have one main capacitor, which is responsible for starting the motor.
Modern refrigerators, especially those with energy efficiency class A+ and higher, are often equipped with inverter compressors. In such systems, the role of capacitors is taken on by complex electronic control boards (inverters), which smoothly regulate the speed of shaft rotation. Here you may not find the usual cylindrical barrels in the motor power circuits, since all the electronics are integrated into a single unit or the compressor itself. However, even in inverter models there may be mains filters or smoothing capacitors on the control board, but their functions and location differ from the classic circuit.
⚠️ Attention: Never Do not try to replace the capacitor in an inverter refrigerator with one of similar capacity from an older model. The inverter electronics are extremely sensitive to parameters, and installing an unsuitable element can lead to the burning of an expensive control board.
It is also worth considering the presence of additional systems. If the refrigerator has an electronically controlled function, additional capacitors may be located on the main board to stabilize the voltage of sensors and fans. However, when talking about “capacitors in the refrigerator,” craftsmen usually mean the power elements of the motor-compressor. No Frost with electronic control, additional capacitors can be located on the main board to stabilize the voltage of sensors and fans. However, when talking about “capacitors in the refrigerator,” craftsmen usually mean the power elements of the motor-compressor.
Where the capacitors are located: search in the unit
The search for capacitors starts from the back of the refrigerator. It is there, in the lower zone, that the compressor is located. In classic models, next to it, often in a black plastic or metal casing, is the start relay. To get to it, you need to remove the protective cover, which is usually held in place by latches or screws. The element you are looking for is hidden inside this block.
If we are talking about more complex systems or refrigerators with a display and electronic control, the second “center” of concentration of capacitors is main control board. It can be located either in the upper part of the body (behind the decorative panel), or be built into the door or located in the lower technical niche. On the board you will see many small cylindrical or rectangular elements - these are electrolytic capacitorsresponsible for the operation of the logic, and not for starting the motor.
It is important to distinguish between installation locations depending on designs:
- 🔌 Compressor zone: here are high-capacity power capacitors (usually from 10 to 50 μF), often black or gray, cylindrical in shape.
- 💻 Electronic unit: here are low-power capacitors for filtering noise and stabilizing currents in control circuits.
- ❄️ Inside the chamber: In rare cases, if there is a complex ice generation system or a display on the door, there may be additional elements in the wiring harness, but this is rather an exception.
Types of capacitors in refrigeration
There are two main types of capacitors used in refrigerators, each of which performs its own unique function. The starting capacitor is turned on only for a short time - at the moment the engine starts, helping it gain the necessary speed. As soon as the motor reaches operating mode, the centrifugal switch or relay opens the circuit, turning off this element. Its capacity is usually higher than that of the working capacitor.
The working capacitor, if provided by the engine design, remains connected throughout the entire operation of the compressor. It improves engine performance, increases its efficiency and stabilizes the current. Modern single-phase refrigerator motors often use a combined circuit or do without them altogether, relying on the design of the windings. Understanding your capacitor type is critical when selecting a replacement.
| Parameter | Start capacitor | Run capacitor |
|---|---|---|
| Running time | Short term (1-3 seconds) | Constant |
| Capacity | High (often 50-100 µF and above) | Medium (usually up to 30-40 µF) |
| Voltage | 220-250 V (AC) | 250-450 V (AC) |
| Location | In the starting relay | In the winding circuit or relay |
It is worth noting that most household refrigerators use a c starting capacitorcircuit, which is integrated into the starting relay. Free-standing run capacitors are less common, mainly in powerful industrial models or specific engines of older series. Therefore, when answering the question “how many capacitors”, most often we are talking about one element in the compressor area.
Fault symptoms and diagnostics
How to understand that the capacitor has failed? The first and most obvious sign is a characteristic click when trying to start, after which the compressor hums, but does not start, and after a few seconds the click of the protective relay is heard again. This indicates that starting torque is insufficient to turn the engine shaft. The motor tries to start, consumes high current, the protection is triggered, and the cycle repeats.
Another symptom is compressor overheating. If the refrigerator is working, but the motor housing becomes scalding hot, and the electricity consumption has increased, the run capacitor (if there is one in the circuit) may be faulty or the starting “stuck” in the circuit. Also, a malfunction may be indicated by unstable operation: the refrigerator turns on and off without reaching the desired temperature.
For accurate diagnostics, you need a multimeter with a capacitance measurement function. Before testing, the capacitor must be unsoldered or disconnected from the circuit and discharged by closing the contacts with a screwdriver with an insulated handle (being careful). The measured capacitance should not differ from the nominal value indicated on the case by more than 20%. If the device shows zero, infinity or a significant deviation, the element requires replacement.
⚠️ Attention: Visual inspection does not always give a 100% result. Swelling of the housing or leaks of electrolyte are a clear sign of failure, but the capacitor may look perfect and still not hold capacity.
Is it possible to start a refrigerator without a capacitor?
Theoretically, some engines can start without a starting capacitor if you turn the shaft manually at the moment of switching on, but this is extremely dangerous and is not recommended. Long-term operation without a capacitor will lead to burnout of the starting winding and failure of the compressor.
Replacement process and selection of analogues
Replacing a capacitor is a procedure accessible to a home craftsman with basic skills, but requiring care. The main rule: the new element must have a capacitance identical to or as close as possible to the original (permissible deviation is ±5-10 µF for starting ones). The voltage should be equal to or higher than the original one. Installing a capacitor with a lower voltage will lead to its rapid failure and possible explosion.
The replacement process is as follows:
- 🛠️ Disconnect the refrigerator from the mains and remove the back cover.
- 🔌 Remove the start relay from the compressor (usually it is simply is removed from the pins).
- 🔍 Open the relay case, take a photo of the connection diagram and unsolder the old capacitor.
- ⚙️ Install the new element, observing the polarity (if it is indicated, although for alternating current it is less critical, but it is better to focus on the markings), and assemble everything in reverse order.
☑️ Checklist before replacement
It is important to use specialized capacitors for motors (Motor Run/Start), and not ordinary electrolytic ones, which may not withstand operating conditions. When soldering, try not to overheat the leads so as not to damage the internal structure of the new element. After replacement, it is necessary to check the idle operation of the refrigerator, monitoring the temperature of the compressor.
Conformity table and common errors
When searching for a replacement, confusion often arises in the markings. Manufacturers use different codes, which makes selection difficult. Below is a table that helps you navigate the main parameters found in refrigerators of popular brands.
| Refrigerator brand | Typical capacity (uF) | Voltage (V) | Common error |
|---|---|---|---|
| Atlant (old) | 10 - 16 uF | 250 V | They set 450V (possible, but larger) |
| Indesit / Ariston | 12 - 20 µF | 250 V | Ignore type (starting/running) |
| Biryusa | 16 - 25 µF | 250-300 B | Use oxide instead of film |
| Modern (China) | Individually | 450 V | Attempted repair instead of replacing the board |
One of the common mistakes is installing the capacitor “by eye” or using elements from other equipment, for example, from washing machines or air conditioners. Although they may be physically suitable, their characteristics (ESR, ripple current, temperature range) may not meet the requirements of a refrigeration compressor that operates in environments with vibration and temperature changes.
⚠️ Attention: Refrigerator parts may vary, even within the same model, depending on the year of manufacture. Always check the markings on the body of the old element before purchasing a new one.
Frequently asked questions (FAQ)
Is it possible to use a capacitor with a larger capacity than was originally installed?
Not recommended. An increase in capacity by more than 10-15% will lead to excessive heating of the motor windings and a decrease in its service life. The compressor will operate with overcurrent.
Why does a new capacitor burn out after a week?
There may be several reasons: incorrect voltage selection (too low), a malfunction of the compressor itself (turn-to-turn short circuit), or problems with the starting relay, which does not turn off the starting winding in time.
Are there capacitors in inverter refrigerators?
They may not be present in the compressor power circuit, since the inverter unit starts the operation. However, on the inverter board itself, capacitors are present in large quantities for filtering and stabilization.
How to safely discharge a capacitor before testing?
Use a screwdriver with an insulated handle. Connect the metal contacts (leads) of the capacitor to each other. A spark may jump - this is normal. After this, you can safely touch the terminals.
Does the room temperature affect the operation of the capacitor?
Yes. Capacitors are sensitive to overheating. If the refrigerator is located close to the wall or in a hot niche, the temperature in the compressor area increases, which shortens the life of the condenser and can lead to swelling.