Sudden stoppage of the refrigerator LG often becomes an unpleasant surprise that requires immediate intervention. If the unit stops freezing, and water appears inside or food begins to spoil, the first suspicion falls on the heart of the system - the compressor. It is this unit that is responsible for the circulation of the refrigerant, and its failure paralyzes the entire operation of the household appliance.
Before calling a technician or looking for a new unit, it makes sense to carry out initial diagnostics yourself. Understanding how to check the compressor on a refrigerator LGwill allow you to save a significant amount on calling a specialist if the problem turns out to be minor, or to reasonably discuss the breakdown with the service center. It is important to act carefully, observing safety precautions when working with electrical appliances.
In this article we will analyze in detail the testing algorithm, the necessary tools and typical symptoms of motor failure. You will learn to distinguish between a breakdown of the compressor itself and a faulty start relay or wiring problems. A competent approach to diagnostics is the key to successful and quick repair of your equipment.
Primary visual diagnostics and condition assessment
You should always start checking the refrigerator compressor LG with an external inspection and analysis of the behavior of the unit. Often, characteristic signs of a malfunction can be noticed without the use of complex measuring equipment. Careful observation of the operation of the device in the first minutes after switching on can provide up to 50% of information about the state of the electric motor.
Pay attention to the sound of the operation. A working compressor emits a smooth, monotonous hum, which can intensify during moments of active cooling. If you hear clicking noises, a buzzing sound that stops abruptly, or complete silence while the power light is on, there is a problem. Particularly alarming are sounds similar to metallic clanging or knocking, indicating mechanical destruction of internal components.
⚠️ Attention: If you smell burning or see sparking in the compressor area, immediately unplug the refrigerator. Continued operation in this condition may result in a short circuit or fire.
It is also critically important to evaluate the temperature conditions of the motor housing. After 15–20 minutes of operation, the back wall of the refrigerator and the compressor itself should be warm or hot (depending on the model and load). If the unit has been running for an hour, and the tubes and motor housing remain cold, this indicates that Freon circulation is missing. In such a situation, the compressor may run idle or not start at all.
📊 How does your LG refrigerator behave?It hums, but does not freezeIt turns on and turns off immediatelyDoes not respond at all to being turned onIt freezes, but too weaklyNecessary tools for checking the motor
For high-quality diagnostics of the refrigerator compressor LG you will need a minimum set of tools that many home craftsmen can find. The main device will be a multimeter (tester), which allows you to measure the resistance of the windings and check the integrity of the circuit. Without this device, an accurate check of the electrical part the engine is impossible.
In addition to the multimeter, a set of screwdrivers (phillips and flat) for removing protective covers and panels. In some models LG access to the compressor may be difficult, and you will need to carefully remove the back cover. Also, pliers for working with terminals and electrical tape for marking wires will not be superfluous, so as not to mix them up during assembly.
- 🛠️ Multimeter - the main device for measuring the resistance of windings and checking for breakdown.
- 🔧 Screwdriver set - necessary for disassembling the case and removing the protective box compressor.
- 🧤 Dielectric gloves —ensure safety when working with live electrical components.
- 🔦 Flashlight —improve visibility in hard-to-reach places on the back panel of the refrigerator.
If you plan to carry out more in-depth diagnostics, including checking pressure, you will need a pressure gauge station. However, for the initial determination of the serviceability of the compressor at home, the usual testeris usually sufficient. It is important that the multimeter probes are in good working order and that the battery in the device is not discharged, otherwise the readings will be incorrect.
Removing the protective casing and accessing the contacts
To check the compressor on the refrigerator LG, you need to gain physical access to its electrical contacts. The process begins by disconnecting the device from the power supply - this is the first and immutable safety rule. Only after making sure that the cord is unplugged from the outlet can you begin disassembly.
Position the refrigerator so that you have easy access to its rear. Remove the bottom panel or protective cover covering the compressor compartment. In modern models LG fastening can be carried out using latches or screws. Act carefully so as not to damage the plastic fastening elements.
After removing the casing, you will see a black cylindrical or pear-shaped cylinder - this is the compressor. On one of the sides (usually on the side or back) a starting relay and a thermal relay, covered with a plastic box, are connected to it. It is this box that needs to be removed to get to the contact group. Usually it is held on by metal brackets or plastic clamps.
Sequence of actions:1. Disconnect the refrigerator from the network.
2. Remove the rear metal panel.
3. Remove the plastic casing from the compressor contacts.
4. Carefully disconnect the relay connector.When removing the relay, be careful: the contacts may be oxidized, and the plastic may become brittle over time. Sudden movements can cause the relay mounting lugs to break, creating additional problems. If the relay is difficult to remove, it is better to slightly rock it from side to side, freeing it from the latches.
☑️ Preparation for diagnostics
Done: 0 / 4Checking the integrity of the windings with a multimeter
The most reliable way to check a refrigerator compressor LGis to measure the resistance its windings. To do this, switch the multimeter to resistance measurement mode (Ohm). There are usually three terminals on the compressor contact group: two upper and one lower (the location may vary, but the diagram is standard). These terminals correspond to the starting, operating winding and common point.
You need to measure the resistance between each pair of contacts. Touch the probes to the two contacts and record the readings, then repeat the procedure for the other pairs. For a working engine LG the sum of the resistances between any two pairs should be equal to the resistance of the third pair. This is a fundamental law of physics for such engines.
Typical resistance values for compressors LG vari within certain limits. The working winding usually has less resistance than the starting winding. If the device shows infinity (open) or zero (short circuit) on any of the windings, this indicates a fatal engine malfunction. In this case, repairing the compressor is impractical; its replacement is required.
Pair of contacts Normal resistance (Ohm) Possible malfunction Working - General 10 – 25 Ohm Open or short winding Starting winding - General 20 - 45 Ohm Malfunction of the starting winding Working - Starting 30 - 70 Ohm (sum) Circuit integrity violation Any contact - Housing Infinity (∞) Breakthrough to the housing (dangerous!) Pay special attention to checking for breakdown of the housing. Press one multimeter probe to any contact, and the second to the place on the compressor housing that has been cleared of paint. The device should show infinity. If the arrow deviates or a signal sounds, it means that the insulation is broken and goes to the housing. Operating such a refrigerator is deadly. electric current goes to the body. Operating such a refrigerator is deadly.
Diagnostics of the starting relay and thermal protection
Often the situation when the compressor does not start is associated not with the engine itself, but with auxiliary elements - the starting relay and thermal protection. These components are responsible for starting the motor and protecting it from overheating. Refrigerators LG use different types of relays, but the principle of checking them is similar.
Visually inspect the relay for melting, blackening or cracks. If the plastic is deformed, the device definitely requires replacement. Also check the contacts for the presence of oxides. The thermal protection (tablet) should “ring” when tested with a multimeter in a cold state. If the circuit is open on a cold tablet, it is faulty.
- 🔍 Visual inspection - look for traces of burning, soot or melted plastic on the relay body.
- 🔊 Sound test - shake the relay near your ear. If you hear a knocking sound from internal parts, the core or contacts may be broken.
- ⚡ Circuit continuity —make sure the relay contacts open and close correctly (some types of relay require testing under voltage with caution).
⚠️ Attention: Start relay is a consumable item. Even if it is in good condition, but the compressor is old and worn out, the relay can often fail due to increased starting currents of the engine.
If the relay and thermal protection are working, but the motor hums and does not start, or starts for a few seconds and stalls, the problem may lie in a jammed mechanism compressor. Attempts to “wedge” the motor by applying increased voltage or blows often give only a temporary effect and can finally finish off the unit.
Is it possible to temporarily start a refrigerator without a relay?
There is a method of directly starting the compressor through a cord with a plug, bypassing the relay. However, this is an emergency diagnostic measure. You can keep the compressor turned on directly for no more than 3-5 seconds, otherwise the winding will burn out. This method is not intended for long-term operation of the refrigerator.
Typical symptoms of a malfunction and their meaning
Understanding the symptoms helps to narrow down the search for a malfunction. Each sound or behavior of the refrigerator LG carries information about the state of the system. For example, if the compressor hums but does not start, and after a few seconds a click is heard, this is a classic sign that the thermal protection relay has tripped.
This can happen for three reasons: the starting relay is faulty, the compressor is jammed, or a breakdown of the windings has occurred. If the motor starts, runs for several minutes and turns off without cooling the chamber to the required temperature, perhaps the problem is a freon leak or a clogged capillary tube, but the the compressor compressor itself is OK.
Continuous operation of the motor without shutting off is also an alarming signal. This indicates that the refrigerator is unable to reach temperature. The reasons may be a loose fit of the door seal, a malfunction of the temperature sensor, or loss of performance of the compressor itself due to wear of the piston group.
It is important to distinguish between vibration noise and mechanical knocking noise. Vibration is transmitted to the body and floor; it can be reduced by leveling the legs of the refrigerator. A mechanical knock inside the compressor indicates destruction of the valves or connecting rods, which requires immediate replacement of the unit.
Frequently asked questions (FAQ)
Is it possible to replace the compressor on an LG refrigerator yourself?
Theoretically, it is possible if you have the skills to work with the tool and understand the device refrigeration systems. However, replacement requires a vacuum pump, a pressure gauge station and a supply of freon. Without special equipment, it will not be possible to fill the system with refrigerant efficiently, so it is better to entrust this work to professionals.
How much does a new compressor for an LG refrigerator cost?
The cost of a new compressor varies depending on the model of the refrigerator and the type of motor (inverter or conventional). The price can range from 5 to 15 thousand rubles and above, not including the cost of replacement and refueling. Inverter compressors LG are usually more expensive than traditional ones.
Why is the compressor hot but the refrigerator is not freezing?
If the compressor is hot but there is no cold, this often indicates a refrigerant leak or a blockage in the system. The motor works, trying to create pressure, but there is not enough freon in the circuit for heat exchange. Also, the reason may be a loss of compressor performance due to wear.
How to extend the life of the compressor?
To extend the life of the compressor LG do not place the refrigerator close to the wall, provide ventilation for the rear grille, do not load the chamber with hot foods and regularly defrost the unit (if this is not No. Frost). Voltage surges are also harmful, so it is recommended to use a stabilizer.