LG Portable Air Conditioner Compressor Not Working

Portable air conditioners, like the ones manufactured by LG, are convenient cooling solutions for homes and offices. However, if you find that the compressor of your LG portable air conditioner is not working, it can be a frustrating experience, especially in hot weather. This guide will help you diagnose and address common issues that may be causing your compressor to malfunction.

Check Power Supply


2. Circuit Breaker: Verify that the circuit breaker for the outlet or the dedicated circuit for the air conditioner has not tripped. If it has, reset it and try turning the air conditioner on again.

Thermostat Settings

1. Thermostat Settings: Ensure that the thermostat is set to a temperature lower than the current room temperature. The compressor will not turn on if the thermostat is set too high.

2. Mode Selection: Verify that the air conditioner is set to the cooling mode. Some units have multiple modes, including fan-only and dehumidification, which do not activate the compressor.

Filter and Airflow

1. Air Filter: A clogged air filter can restrict airflow and cause the compressor to overheat or not work efficiently. Check the filter and clean or replace it if it’s dirty.

2. Airflow Obstructions: Make sure there are no obstructions near the air intake or exhaust of the unit, as this can affect its performance.

Temperature Conditions

1. Ambient Temperature: Portable air conditioners have limitations in terms of the ambient temperature they can operate in. If it’s too cold or too hot, the compressor may not engage. Refer to the user manual for the recommended operating conditions.

2. Overheating Protection: Some air conditioners have built-in safety features that prevent the compressor from running continuously in extremely high temperatures. If this is the case, wait for the room to cool down and try again.

Refrigerant Levels

1. Refrigerant Leak: Low refrigerant levels can prevent the compressor from functioning correctly. If you suspect a refrigerant leak, it’s best to contact a professional technician to diagnose and repair the issue, as handling refrigerant requires specialized equipment.

Internal Components

1. Control Panel Issues: Check the control panel for any error codes or warning lights. Consult the user manual for information on what these indicators mean and how to address them.

2. Internal Wiring: If you have experience with electronics, inspect the internal wiring for loose or damaged connections. However, if you are not comfortable doing this, it’s advisable to seek professional help.

Technical Support

1. Warranty: If your LG portable air conditioner is still under warranty, contact LG customer support or the retailer where you purchased it. They may be able to provide guidance or arrange for a repair or replacement.

2. Professional Repair: If none of the above steps resolves the issue, it’s best to consult a certified HVAC technician or LG’s authorized service center. They have the expertise and equipment to diagnose and fix more complex compressor problems.

In conclusion, a non-functioning compressor in your LG portable air conditioner can be due to various factors, from simple power issues to more complex internal problems. By following these troubleshooting steps, you can often identify and resolve the issue yourself. However, if the problem persists, it’s wise to seek professional assistance to ensure your air conditioner operates efficiently and reliably.

Evaporator and Condenser Coils

1. Dirty Coils: The evaporator and condenser coils play a crucial role in heat exchange. Over time, they can accumulate dust and debris, reducing the efficiency of the air conditioner. Clean these coils with a coil brush or compressed air to ensure optimal performance.

2. Coil Temperature Sensors: Some air conditioners have temperature sensors on the coils. If these sensors are faulty or covered in dirt, they can misinterpret temperature readings, preventing the compressor from running. Clean or replace these sensors if necessary.

Capacitor and Start Relay

1. Capacitor Check: The compressor’s start and run capacitors help kick-start the motor. A faulty capacitor can prevent the compressor from starting. You can test the capacitors with a multimeter. If they are defective, replace them.

2. Start Relay: The start relay is responsible for sending power to the compressor motor. If it’s malfunctioning, it can inhibit the compressor’s operation. Test the start relay and replace it if it’s defective.

Refrigerant Issues

1. Refrigerant Pressure: If you suspect a refrigerant issue, you’ll need a pressure gauge to check the refrigerant levels. Low refrigerant levels can be due to a leak, which should be repaired by a professional technician.

2. Refrigerant Charging: Correctly charging the refrigerant is crucial for the compressor to work efficiently. Overcharging or undercharging can lead to problems. A professional technician should perform this task.

Compressor Motor

1. Compressor Motor Testing: Using a multimeter, check the electrical resistance of the compressor motor windings. If there are no continuity readings, it indicates a faulty motor, which needs replacement.

2. Compressor Overload Protection: Some compressors have overload protection that can trip if the compressor overheats. Wait for the overload to reset, but if it keeps tripping, there may be a more significant issue with the compressor.

Electronic Control Board

1. Control Board Testing: If you suspect a control board issue, you’ll need to test it for faults. This usually requires advanced knowledge and equipment. If the control board is malfunctioning, it can inhibit the compressor’s operation.

Additional Considerations

1. User Manual: Always consult the user manual for your specific LG portable air conditioner model. It may contain troubleshooting steps specific to your unit.

2. Professional Assistance: If you’re uncomfortable performing any of the advanced troubleshooting steps or if the issue remains unresolved, it’s strongly recommended to contact a certified HVAC technician or LG’s authorized service center. They have the expertise and equipment to diagnose and repair complex compressor problems safely.

3. Warranty and Extended Coverage: Be sure to check if your unit is still under warranty or if you have extended warranty coverage. Repairs or replacements may be covered, saving you on repair costs.

Troubleshooting Steps

Step NumberTroubleshooting ActionDescriptionExpected ResultActual Result
1Check Power SupplyVerify power sourcePower available?Yes/No
2Thermostat SettingsSet thermostat correctlyCorrect settings?Yes/No
3Air Filter InspectionInspect air filterClean/dirty filter?Clean/Dirty
4Cooling ModeSelect cooling modeCooling engaged?Yes/No
5Compressor TestRun compressor testCompressor starts?Yes/No

Error Codes and Messages

Error CodeError MessageDescriptionTroubleshooting StepsResolution
E1Low VoltageVoltage too lowCheck power supplyVoltage check
E2High VoltageVoltage too highCheck power supplyVoltage check
E3Thermostat ErrorSensor malfunctionCheck thermostatReplace sensor
E4Fan Motor FailureFan not workingInspect fan motorRepair/Replace
E5Refrigerant LeakRefrigerant lossCheck for leaksRepair/Recharge

Common Causes

CauseDescriptionSymptomsTroubleshooting StepsSolution
Power Supply IssuesProblems with power sourceNo power, no displayCheck power sourceFix power supply
Thermostat ProblemsMalfunctioning thermostatIncorrect temperatureCheck thermostat settingsCalibrate/Replace
Clogged Air FilterDirty or clogged air filterPoor cooling, airflowInspect and clean filterReplace/Regular cleaning
Compressor FailureCompressor not functioningNo cooling, warm airRun compressor testRepair/Replace compressor
Refrigerant LeakRefrigerant leakingInsufficient coolingInspect for leaksRepair and recharge

Component Inspection

Air FilterFront or Side PanelCleanlinessClean/DirtyClean or Replace
ThermostatControl PanelWiring and SensorIntact/FaultyRepair/Replace
Fan MotorInside UnitRotationSpins/StuckLubricate/Replace
CompressorBack of the UnitWiring and OperationIntact/Not WorkingRepair/Replace
Refrigerant LinesBack of the UnitVisible LeaksNo Leaks/LeaksRepair and Recharge

Recommended Maintenance

Maintenance TaskFrequencyDescriptionTools NeededNotes
Clean Air FilterMonthlyRemove and clean filterScrewdriver, BrushEnsure proper airflow
Check WiringAnnuallyInspect electrical connectionsScrewdriver, MultimeterPrevent short circuits
Lubricate Fan MotorBiannuallyApply lubricant to fan motorLubricant, WrenchEnsure smooth operation
Clean Condenser CoilsAnnuallyRemove debris from coilsCoil brush, HoseImprove heat exchange
Check Refrigerant LevelsAnnuallyMeasure refrigerant levelsManifold GaugeMaintain cooling efficiency


In summary, if basic troubleshooting steps don’t resolve the issue with your LG portable air conditioner compressor, it’s time to consider more advanced diagnostics and potentially professional assistance. The compressor is a critical component, and its proper functioning is essential for effective cooling. Taking a systematic approach to troubleshooting and repair will help ensure your air conditioner operates efficiently and keeps you comfortable during hot weather.

LG Portable Air Conditioner Compressor Not Working

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