Replacing the refrigerator compressor with your own hands: a step-by-step guide with photos and tips

Replacing a compressor is one of the most difficult, but doable tasks when repairing a refrigerator at home. If your unit stops freezing, makes loud knocking noises, or does not turn on at all, the problem most likely lies in this unit. In workshops, for such work they ask from 5 to 15 thousand rubles (depending on the model and region), while the compressor itself will cost 3–8 thousand. Self-repair will help you save money, provided that you are willing to spend 3-5 hours and strictly follow the instructions.

This article is suitable for owners of refrigerators Atlant, Indesit, Samsung, LG, Beko and other popular brands with a classic compressor cooling system. We will analyze the entire process: from diagnosing the malfunction to the first start after replacement. Important: If your refrigerator is gas-powered (Absorption) or with an inverter compressor, the algorithm will be different, and it is better to contact a specialist.

Before you start, be honest evaluate your strengths. The work requires accuracy, understanding of the principles of the refrigeration cycle and ability to use tools. If you haven't repaired a home appliance before, practice on something simpler, like replacing the thermostat or cleaning the drainage system. And remember: improper installation of the compressor or a violation of the tightness of the system can lead to freon leakage and complete failure of the refrigerator.

1. Diagnostics: how to understand that the compressor is faulty

Before disassembling the refrigerator, make sure that the problem is in the compressor. Symptoms of its failure often coincide with malfunctions of other components - thermostat, start relay or freon leak. Here are the key signs:

• 🔊 Loud hum or knocking during operation - may indicate wear of the piston group or valve failure. Normally, the compressor should hum quietly.
• ❄️ Lack of cold in the chambers when the engine is running - if the compressor hums, but does not freeze, a freon leak or piston jamming is possible.
• ⚡ The compressor does not turn on in general - check the start relay (it may click) and the thermostat. If there is power, but the motor is silent, the winding is probably burned out.
• 🔥 Overheating of the compressor housing - normally it should be warm, but not scalding. Strong heating indicates an interturn short circuit.
• 🕒 Continuous operation without shutdowns - if the motor does not turn off for more than 1-2 hours, it may have lost power and cannot gain the required pressure.

For For accurate diagnostics, use a multimeter:

1. Unplug the refrigerator and remove the back cover (at the bottom where the compressor is located).
2. Disconnect the start relay terminals from the compressor. Usually there are three of them: C (common), S (starting winding), R (working winding).
3. Measure the resistance between the contacts:
   • C–S and C–R —should be 15–40 Ohms (depending on the model).
   • S–R - the sum of the two previous values (for example, if C–S = 20 Ohms and C–R = 15 Ohms, then S–R = 35 Ohms).

If the resistance is 0 (short circuit) or ∞ (open), the compressor is faulty.

⚠️ Attention: If the compressor is externally intact, but does not pump freon (no pressure in the system), it will still have to be replaced. This can only be checked using a pressure gauge manifold - without it, you risk installing a new compressor in a leaky system.

2. Preparation: tools and materials

To replace the compressor you will need:

Also prepare:

• 🔧 Set of screwdrivers (phillips, flat).
• 🔨 Pliers and side cutters.
• 📏 File for cleaning tubes.
• 🧴 Alcohol or solvent for degreasing.
• 🧤 Gloves and safety glasses (freon under pressure is dangerous!).

If you have never soldered copper pipes, practice on unnecessary scraps. Connections should be made. sealed - the slightest leak of freon will nullify all efforts. You can invite a specialist to refill freon (this will cost 1-2 thousand rubles), but it is better to do the evacuation of the system yourself to make sure it is tight.

Disconnect the refrigerator from the network for 24 hours (to bleed out the freon)|Prepare a well-ventilated room|Check the availability of spare parts valves and filter-drier|Take a photo of the connection diagram of the tubes (before dismantling)-->

3. Dismantling the old compressor: step-by-step instructions

At this stage, the main thing is not to damage the tubes and not to lose parts. Follow the algorithm:

1. Bleed off the remaining parts. freon.

   Even if the refrigerator was not working, gas under pressure may remain in the system. Wear gloves and glasses, then cut capillary tube (a thin copper tube going from the compressor to the evaporator) with side cutters 10-15 cm from the compressor. Do this outside or in a ventilated room - freon. non-toxic, but in high concentrations it can cause dizziness.

2. Unsolder the tubes.

   Heat the soldering area with a gas torch and carefully remove the tubes from the compressor - do not pull them by force - copper is soft and may tear. the tubes are stuck, use flux for soldering.

3. Disconnect the electrics.

   Remove the start relay terminals (remember or take a photo of the connection order!). Unscrew the bolts securing the compressor to the refrigerator frame (usually there are 3-4 of them).

4. Remove the compressor.

   Carefully remove it from the housing. Be careful - it is heavy (10-15 kg) and may contain oil.

After dismantling, inspect filter drier (the small cylinder on the tube next to the compressor). darkened or swollen - it also needs to be replaced. It is inexpensive (200–500 rubles), but this part cannot be ignored: a clogged filter will lead to repeated failure.

What to do if the tubes are broken?

If you damaged the copper ones during dismantling tubes, don’t panic. They can be restored using repair. couplings (sold in plumbing stores). The main thing is to make sure that the soldering area is sealed. Before filling the freon, check the system for leaks with a soap solution: apply it to the connections and apply air under pressure (for example, from a bicycle pump, you can continue).

4. Installing a new compressor

The new compressor must be complete analogue old in power, type of freon and fastenings. If you buy a used part, check it with a multimeter (as described in section 1).

1. Fix the compressor on the frame.

   Use the same bolts and rubber gaskets (they dampen vibration). Tighten the fasteners crosswise to avoid distortions.

2. Solder the tubes.

   First put them on the tubes heat-shrinkable tubes (they will protect the soldering from oxidation). Then heat the joint with a torch and apply solder. Avoid overheating - the copper may warp. After soldering, slide the tubes onto the seam and heat them with a lighter until they fit tightly.

3. Install a new filter drier.

   Cut off the old one, clean the tube with a file and solder the new filter (arrow on it should indicate the direction of movement of freon - from the compressor to the evaporator).

4. Connect the electrics.

   Connect the terminals of the start relay to the compressor according to the diagram (photo that you took earlier). Check that the contacts are not oxidized - if necessary, clean them with sandpaper.

After installation, do not rush to turn on the refrigerator! First you need evacuate the system and fill with freon.

5. Evacuation and refilling of freon

This stage is critical for the durability of the refrigerator. If moisture or air remains in the system, the new compressor will quickly fail.

1. Connect the vacuum pump.

   Connect the pump to service pipe (usually a thin tube with a plug on the compressor) through a pressure manifold. Turn on the pump for 20–30 minutes. The arrow on the pressure gauge should drop to -1 bar (vacuum).

2. Check the tightness.

   Close the pump valve and observe with the pressure gauge for 10–15 minutes. If the arrow does not rise, the system is sealed. If the pressure rises, look for a leak (soap solution will help).

3. Fill with freon.

   Connect the freon cylinder to the manifold (via the reducer!). Open the cylinder valve and slowly fill the gas, monitoring the pressure using the pressure gauge. Norm for R134a: 0.3–0.5 bar suction (lower compressor pipe) and 8–12 bar discharge (upper pipe). For R600a the values ​​are different - check the instructions for the compressor.

After refueling, pinch capillary tube with special tongs (or pliers) and seal it. This will prevent freon leakage during further operation.

⚠️ Attention: Freon R600a (isobutane) is explosive! Do not refill it near open flames or heating devices. Work in a ventilated area.

6. First start-up and operation check

Before turning on the refrigerator:

• 🕒 Allow the oil in the compressor to drain down (wait 10–15 minutes after installation).
• 🔌 Make sure that the mains voltage is stable (220–230 V).
• 📸 Check all connections again - they should be dry and without traces of oil.

Turn on the refrigerator and observe:

• ✅ The compressor should start without any extraneous sounds (let's say a slight hum).
• ✅ After 10-20 minutes the back grill (condenser) should become warm.
• ✅ Frost should appear in the freezer after 1-2 hours.

If the refrigerator does not freeze:

• 🔍 Check the voltage at the compressor terminals (should be 220 B).
• 🔧 Make sure that the thermostat is working (close its contacts directly - if the compressor starts, the thermostat needs to be replaced).
• 💨 Perhaps the freon charge is low - add it in small portions (10-15 grams each), controlling the pressure.

7. Typical mistakes and how to avoid them

Even experienced technicians sometimes make mistakes when replacing a compressor. Here are the most common:

Another common problem is incompatibility of compressors in power. For example, if you install a weaker motor than the original one, the refrigerator will not freeze well in hot weather. To avoid this, check the markings on the nameplate of the old compressor. For example, the inscription EGX 90HL means:

• EGX - series.
• 90 - power (approximately 90 W).
• H - high temperature (for refrigerators).
• L — type of freon (R134a).

If you are not sure of the choice, show a photo of the nameplate to the seller in a refrigeration equipment store - he will select an exact analogue.

8. When independent replacement is impractical

In some cases, repairs by yourself manually will cost more than calling a specialist. Refuse the idea of replacing it yourself if:

• 🔧 Your refrigerator is gas-powered (Absorption) or with an inverter compressor - their repair requires special equipment.
• 💸 The cost of a new compressor exceeds 50% of the price of the refrigerator (for example, models older than 10 years).
• 🔥 There is an occurrence in the system oil plug (the compressor is jammed due to oil getting into the discharge tube) - here you need a complete flushing of the system.
• ⚡ You are not confident in your soldering skills or working with freon - a mistake can lead to a gas leak or fire.

Also keep in mind that after self-repair, you lose the warranty (if it was still valid). Service centers often refuse warranty service if they see traces of soldering or non-original parts.

⚠️ Attention: In refrigerators with the system No Frost replacing a compressor often requires additional checking of the fan and defrosting heating element. If ice forms in the freezer after repairs, the problem may not be in the compressor, but in the defrosting system.

FAQ: Frequently asked questions about replacing the compressor

Is it possible to replace a compressor without a vacuum pump?

Technically, yes, but this is risky. Without vacuuming, moisture will remain in the system, which will destroy the compressor over time. The minimum alternative is to flush the system with dry nitrogen (if you have access to a cylinder).

How much. Is freon needed for refilling?

The amount of freon depends on the model of the refrigerator and the length of the pipes. On average:

• For R134a: 50–150 grams.
• For R600a: 30–80 grams.

The exact data is indicated on the compressor nameplate or in the service manual of the refrigerator. Refill in portions, controlling the pressure!

How to check that the new compressor is working correctly?

After starting:

1. Touch condenser (rear grill) - it should be warm, but not hot.
2. Listen to the compressor - it should work in cycles (turn on and off), and not constantly.
3. Check the temperature in the freezer after 4-6 hours - it should drop to -18°C.

If something goes wrong, turn off the refrigerator and double-check the freon charge and electrical connections.

What to do if after replacement the compressor gets hot and turns off?

This is a sign overheatingwhich can be caused by:

• Insufficient amount of freon (the compressor is idling).
• Piston jamming (if the compressor is defective or there was little oil).
• Faulty start relay (check it with a multimeter).

Turn off the refrigerator and let the compressor cool. Then check the pressure in the system and the resistance of the windings.

Can I use a compressor from another refrigerator?

Only if it completely matches:

• Freon type (R134a, R600a etc.).
• Power (no less than the original).
• Oil type (mineral/synthetic).
• The location of the pipes (they must match in diameter and direction).

For example, a compressor from Atlant can be placed on Indesitif their parameters are identical. But it’s better to buy a new one - used compressors often have hidden defects.