The capacitor is one of the key parts of the refrigerator, without which its stable operation is impossible. This small but important part is responsible for starting the compressor and maintaining its performance. However, many users do not even suspect its existence until they encounter a breakdown. If the refrigerator stops freezing, makes strange sounds or does not turn on at all, the capacitor may be the culprit.
In this article we will look at what a capacitor in a refrigerator is, what it looks like (with photo), what functions it performs and how to independently diagnose its malfunction. You will also find out whether you can replace the part yourself and when it is better to contact a specialist. The material will be useful both to owners of old models Atlant, Indesit or Stinoland modern refrigerators Samsung or LG with the No Frost system.
What is a capacitor in a refrigerator and why is it needed?
A capacitor (sometimes called starting or working capacitor) is an electrical component that stores and releases charge to run the compressor. Without it, the refrigerator motor simply will not be able to start working, since the first “push” requires a short-term increase in power. Subsequently, the capacitor maintains stable operation of the system, smoothing out voltage drops.
Most household refrigerators are used electrolytic capacitor cylindrical in shape, filled with a special gel or liquid. It connects to the start relay and the compressor, forming a single circuit. The power and capacity of the part depend on the model of the refrigerator: for example, for Biryusa-18 a capacitor of 10–15 uF may be enough, and for a powerful one Liebeherr 30–40 uF will be required.
- 🔌 Main function: ensuring the start of the compressor due to a short-term increase in current.
- ⚡ Additional role: voltage stabilization in the circuit, protection against overheating.
- 🔄 Types of capacitors: starting (only for starting) and operating (permanently in the circuit).
If the capacitor fails, the compressor either does not start at all or works intermittently. This results in the refrigerator not freezing well, often turning off, or making a loud hum. In some cases, a malfunction can provoke overheating of the compressor windings and its final failure —then repairs will cost many times more.
What it looks like capacitor: photo and location in the refrigerator
The capacitor is usually a small cylinder (sometimes oval-shaped) with two or three terminals. Its body can be metal or plastic, often with container markings (for example, 25 µF ±5% or 400V). Color - black, gray or brown. The size varies from 3 to 6 cm in length and 2–4 cm in diameter.
The location of the condenser depends on the model of the refrigerator:
- 📦 In old models (for example, ZIL-63 or Minsk-15M) it is often mounted next to with a compressor on a metal plate.
- 🔧 B modern refrigerators (Samsung RL-44, LG GA-B489) the capacitor can be hidden under a protective casing or in the block controls.
- ❄️ In systems No Frost sometimes two capacitors are installed: one for the compressor, the other for the fan.
To find the part, first unplug the refrigerator and remove the back panel (if there is one). The capacitor will be connected to the start relay, a small box of wires attached to the compressor. The photo below shows a typical capacitor in the refrigerator Atlant:
[There would be a photo of the capacitor with the caption: "The capacitor in the Atlant refrigerator is a cylindrical body marked 25 µF"]
Signs of a malfunctioning capacitor in the refrigerator
The capacitor may fail due to power surges, overheating, natural wear and tear, or manufacturing defects. You can recognize a breakdown by the following symptoms:
| Symptom | Possible cause | What to do |
|---|---|---|
| The refrigerator does not turn on, but the light inside is on | The capacitor does not supplies current to the compressor | Check with a multimeter, replace |
| The compressor hums, but does not start | Insufficient capacitor capacity to start | Replace with a part with a larger capacity |
| The refrigerator turns on, but after 1-2 seconds it turns off | Short circuit in the capacitor | Urgent replacement, checking the relay |
| Frequent clicks of the relay without starting the motor | The capacitor does not hold a charge | Diagnostics with a tester |
One of the most obvious signs is swelling of the capacitor body. If the cylinder is swollen or electrolyte is leaking from it, the part must be replaced immediately. Also pay attention to the burning smell: it may indicate burnt contacts or compressor windings due to a faulty capacitor.
⚠️ Attention: If the refrigerator makes a loud hum, but does not freeze, do not try to turn it on repeatedly “for luck.” This can lead to blocking of the compressor and its complete failure.
How to check a refrigerator capacitor with a multimeter
To diagnose the capacitor you will need a multimeter with a capacity measurement function (indicated as 20 µF or similar). Before checking, be sure to discharge the capacitor by shorting its terminals with a screwdriver with an insulated handle - otherwise you risk getting an electric shock.
Procedure:
- Disconnect the refrigerator from the network and remove the back panel.
- Disconnect the wires from the capacitor (it is better to take a photo of the circuit connections!).
- Switch the multimeter to capacitance test mode (
20 µFor200 µF, depending on the model). - Touch the leads of the capacitor with the probes (polarity is not important for non-polar parts).
Results:
- 🔋 If the readings are close to the markings on the case (for example, 24–26 µF at a nominal 25 µF) - the capacitor is working.
- 🚨 If the capacity is below 10-15% of the nominal or equal to 0 - the part is faulty.
- ⚡ If the multimeter shows
OL(open) - the capacitor is broken.
☑️ Checking the capacitor with a multimeter
If you don’t have a multimeter at hand, You can check the capacitor “for a spark”: briefly connect it to a 220V network (holding the insulated parts!). A working part will give a bright spark when connected. But this method is dangerous —use it only as a last resort.
How to replace a capacitor in a refrigerator with your own hands
Replacing a capacitor is one of the few refrigerator breakdowns that you can fix yourself without special skills. The main thing is to choose a similar part and follow safety precautions.
Step-by-step instructions:
- Selection of spare parts. Buy a capacitor with the same capacity and voltage (for example, if the old one was on
25 µF / 400V, the new one should be identical). The markings are indicated on the body. For modern refrigerators, brand capacitors are suitable Capacitor, Samwha or Nichicon. - Removing the old capacitor. Unplug the refrigerator, remove the back cover and disconnect the wires (memorize or photograph their location!). Unsolder or cut off the leads.
- Installing a new one. Solder or connect a new capacitor, observing the polarity (if indicated). Make sure that the wires do not touch the housing.
- Check. Turn on the refrigerator and listen: the compressor should start without buzzing or clicking.
⚠️ Attention: If after replacing the condenser the refrigerator still does not work, the problem may be compressor or start relay. In this case, it is better to call a specialist - independent repair of these components requires special equipment.
The cost of a capacitor for a refrigerator is from 300 to 1500 rubles, depending on the capacity and brand. Replacement at a service center will cost 1,500–3,000 rubles (excluding the cost of the part). Thus, self-repair saves up to 70% of the budget.
What to do if you cannot find a capacitor with the same capacity?
You can install a part with a slightly larger capacity (for example, instead of 25 µF - 30 µF), but do not exceed the nominal value by more than 20%. The voltage must be no lower than the original one (for example, instead of 400V, 450V is suitable).
Common mistakes when replacing a capacitor
Even a simple replacement of a capacitor can result in new problems if mistakes are made. Here are the most common of them:
- ⚡ Ignoring capacitor discharge. Residual charge can damage the multimeter or cause an electric shock.
- 🔌 Incorrect connection of wires. If you mix up the wires from the relay and the compressor, the motor will not start.
- 🔥 Using a soldering iron without protection. When soldering, plastic parts or wire insulation can be damaged.
- 📏 Installing a capacitor with inappropriate parameters. A container that is too small will not start the compressor, too large will shorten its service life.
Another typical mistake is attempt to repair a swollen capacitor. If the housing is deformed or electrolyte leaks from it, it is impossible to restore it. Such a part can only be replaced.
If after replacement the refrigerator is unstable (for example, the compressor starts with a delay), check:
- The quality of the contacts - the wires must be tightly secured.
- The condition of the starting relay - it may also be faulty.
- Network voltage - if it is below 200V, the compressor will have difficulty starting.
When to call a technician: difficult cases
Not all failures associated with the capacitor can be repaired independently. Contact a specialist if:
- 🔧 Replacing the capacitor did not solve the problem - the compressor still does not start.
- ⚡ When checking with a multimeter, a short circuit was detected in the compressor windings.
- 💥 The capacitor exploded or melted the housing - this may indicate problems in the electrical circuit.
- 📉 The refrigerator works, but does not freeze - perhaps not only the condenser is faulty, but also the thermostat or freon system.
The cost of diagnostics at the service center is 500–1000 rubles. If the problem turns out to be in the compressor, replacing it will cost 5,000–12,000 rubles (depending on the model of the refrigerator). In some cases, it is cheaper to buy a new refrigerator, especially if the old one has lasted more than 10 years.
⚠️ Attention: If the refrigerator is under warranty, do not try to repair it yourself. This will void the manufacturer's warranty.
FAQ: Frequently asked questions about capacitors in the refrigerator
Is it possible to use a capacitor from other equipment (for example, from a washing machine)?
Theoretically, it is possible, but only if the parameters (capacitance and voltage) are completely the same. However, refrigerator capacitors are designed for specific loads, so it is better to buy a part designed specifically for them. For example, a capacitor from a washing machine may not withstand frequent starts of the compressor.
How long does a capacitor last in a refrigerator?
The average service life is 5–10 years, but it depends on the quality of the part and operating conditions. Frequent power surges, high humidity or overheating reduce the resource. In cheap refrigerators (for example Pozis or Saratov) capacitors fail more often than in premium models (Bosch, Siemens).
Why did the new capacitor quickly fail building?
The reasons may be the following:
- Poor quality part (especially if you bought a “no name” instead of a branded capacitor).
- Problems with the starting relay - it can supply too high voltage.
- Power surges in the network (solved installing a stabilizer).
- Overheating of the compressor due to a clogged condenser (grid on the rear wall).
What to do if the condenser is heating up?
Slight heating (up to 50–60°C) is normal, but if the condenser is hot. (you cannot hold your hand), this is a sign of:
- Exceeding the rated current (perhaps the capacity is too small).
- Short circuit in the circuit.
- Faulty start relay.
In this case, you need to turn off the refrigerator and check everything circuit elements with a multimeter.
Is it possible to operate a refrigerator without a capacitor?
No. Without a capacitor, the compressor will not be able to start, since it will not have enough initial current. In rare cases, the motor may start, but will overheat and quickly fail. Experiments with “direct start” (without a capacitor) threaten to break down. compressor.