In extremely hot weather, air conditioners tend to suffer malfunctions more often and heater not working. That’s why it is the peak season for service companies, and technicians often have too little time. If you don’t feel like waiting for a service engineer while the air in your home is getting hotter and hotter, try solutions from the tables below. They provide expert advice on LG air conditioner troubleshooting.
LG basic air troubleshooting
| Problem | Possible causes | Corrective action |
| There is a burning smell and a strange sound coming from the unit. | – | Turn off the air conditioner, unplug the power cord and contact the service center. |
| Water leaks from the indoor unit even when the humidity level is low. | ||
| The power cord is damaged or generating excessive heat. | ||
| A switch, a circuit breaker (safety, ground) or a fuse is not operated properly. | ||
| The air conditioner does not work. | The air conditioner is unplugged. | Check whether the power cord is plugged into the outlet. |
| A fuse is blown or the power supply is blocked. | Replace the fuse or check if the circuit breaker has tripped. | |
| A power failure has occurred. | Turn off the air conditioner when a power failure occurs. When the power is restored, wait 3 minutes, and then turn on the air conditioner. | |
| The voltage is too high or too low. | Check if the circuit breaker has tripped. | |
| The air conditioner turned off automatically at a preset time. | Press the power button again. | |
| The air conditioner does not generate cool air. | Air is not circulating properly. | Make sure that there are no curtains, blinds or furniture blocking the front of the air conditioner. |
| The air filter is dirty. | Clean the air filter once every 2 weeks. | |
| The room temperature is too high. | In summer, it may take some time to cool indoor air. In this case, select the jet cool operation to cool indoor air quickly. | |
| Cold air is escaping from the room. | Make sure that no cold air is escaping through ventilation points in the room. | |
| The desired temperature is higher than the set temperature. | Set the desired temperature to a level lower than the current temperature. | |
| There is a heating source nearby. | Avoid using a heat generator such as an electric oven or a gas burner while the air conditioner is in operation. | |
| Air circulation operation is selected. | In the air circulation operation, air blows from the air conditioner without cooling or heating the indoor air. Switch the operation mode to the cooling operation. | |
| It is not possible to adjust the fan speed. | The auto operation, jet operation or dehumidifying operation is selected. | In some operation modes, such as the jet or dehumidifying operation modes, you cannot adjust the fan speed. Select an operation mode in which you can adjust the fan speed. |
| It is not possible to adjust the temperature. | The air circulation operation or jet operation is selected. | In some operation modes, such as the air circulation or jet operation mode, you cannot adjust the temperature. Select an operation mode in which you can adjust the temperature. |
LG portable air conditioner air troubleshooting
| 1 Self § 1 Diagnosis 1 | Possible Causes | What To Do | |
| Air conditioner does not start | The air conditioner is unplugged. | Make sure the air conditioner plug is pushed completely into the outlet. |
| The fuse is blown/circuit breaker is tripped. | Check the house fuse/circuit breaker box and replace the fuse or reset the breaker. | |
| Power failure. | If power failure occurs, turn the mode control to Off. When power is restored, wait 3 minutes to restart the air conditioner to prevent tripping of the compressor overload. | |
| The current interrupter device is tripped. | Press the RESET button located on the power cord plug. If the RESET button will not stay engaged, discontinue use of the air conditioner and contact a qualified service technician. | |
| FL appears in the display. | The water collection tank is full. Drain the tank and reset your settings. | |
| Room temperature is less than the set temperature. | This is normal. The air conditioner automatically shuts off when the room equals or is less than the set temperature. Adjust the temperature setting, if needed. | |
| Air conditioner does not cool as it should | Airflow is restricted. | Make sure there are no curtains, blinds, or furniture blocking the front of the air conditioner. |
| The temp control may not be set correctly. | In COOL and HEAT model, press the DECREASE T pad. | |
| The air filter is dirty. | Clean the filter at least every 2 weeks. | |
| The room may have been hot. | When the air conditioner is first turned on, you need to allow time for the room to cool down. | |
| Air conditioner freezing up | The cooling coils are iced over. | Ice may block the air flow and obstruct the air conditioner from properly cooling the room. |
| Set the mode control at High Fan or High Cool. | ||
| Air conditioner runs too often or too long | Area to be cooled is too large for the air conditioner. | Consult your dealer for the air conditioner capacity necessary to cool the desired area. |
| Doors or windows are open. | Make sure doors and windows are closed. | |
| Code appears in the display. F1,F2 or F3 | Air conditioner is in FAN mode and the number shown is the set fan speed. | This is normal. The air conditioner is working properly. |
| FL | The water collection tank is full. | Empty the water collection tank. |
| CH01 | Short or open circuit in the indoor air thermistor. | Unplug the air conditioner and contact your authorized LG service center. |
| CH02 | Short or open circuit in the indoor pipe thermistor. | Unplug the air conditioner and contact your authorized LG service center. |
LG R1402 air troubleshooting
| COMPLAINT | CAUSE | REMEDY |
| Fan motor will not run. | No power | Check voltage at outlet. Correct if none. |
| Power supply cord | Check voltage to rotary switch. If none, check power supply cord. Replace cord if circuit is open. | |
| Rotary switch | Check switch continuity. Replace switch if defective. | |
| Wire disconnected or connection loose | Connect wire. Repair or replace loose terminal. | |
| Capacitor (Discharge capacitor before testing.) | Test capacitor. Replace if not within ±10% of manufacturer’s rating. Replace if shorted, open, or damaged. |
|
| Will not rotate | Fan blade hitting shroud or blower wheel hitting scroll. Realign assembly. Units using slinger ring condenser fans must have 1/4 to 5/i6 inch clearance to the base. If it is hitting the base, shim up the bottom of the fan motor with mounting screw(s). Check fan motor bearings; if motor shaft will not rotate, replace the motor. | |
| Fan motor runs intermittently | Revolves on overload. | Check voltage. If not within limits, call an electrician. Test capacitor. Check bearings. Does the fan blade rotate freely? If not, replace fan motor. Pay attention to any change from high speed to low speed. If the speed does not change, replace the motor. |
| Fan motor noise. | Grommets | Check grommets; if worn or missing, replace them. |
| Fan | If cracked, out of balance, or partially missing, replace it. | |
| Blower | If cracked, out of balance, or partially missing, replace it. | |
| Loose set screw | Tighten it. | |
| Worn bearings | If knocking sounds continue when running or loose, replace the motor. If the motor hums or noise appears to be internal while running, replace motor. | |
| Compressor will not run, but fan motor runs. | Voltage | Check voltage. If not within limits, call an electrician. |
| Wiring | Check the wire connections, if loose, repair or replace the terminal. Check wire locations. If not per wiring diagram, correct. | |
| Rotary | Check for continuity. Replace the switch if circuit is open. | |
| Thermostat | Check the position of knob If not at the coldest setting, advance the knob to this setting and restart unit. Check continuity of the thermostat. Replace thermostat if circuit is open. | |
| Capacitor (Discharge capacitor before servicing.) | Check the capacitor. Replace if not within ±10% of manufacturers rating. Replace if shorted, open, or damaged. | |
| Compressor | Check the compressor for open circuit or ground. If open or grounded, replace the compressor. | |
| Overload | Check the compressor overload, if externally mounted. Replace if open. (If the compressor temperature is high, remove the overload, cool it, and retest.) | |
| Compressor cycles on overload. | Voltage | Check the voltage. If not within limits, call an electrician. |
| Overload | Check overload, if externally mounted. Replace if open. (If the compressor temperature is high, remove the overload, cool, and retest.) | |
| Fan motor | If not running, determine the cause. Replace if required. | |
| Condenser air flow restriction | Remove the cabinet, inspect the interior surface of the condenser; if restricted, clean carefully with a vacuum cleaner (do not damage fins) or brush. Clean the interior base before reassembling. | |
| Condenser fins (damaged) | If condenser fins are closed over a large area on the coil surface, head pressures will increase, causing the compressor to cycle. Straighten the fins or replace the coil. | |
| Compressor cycles on overload. | Capacitor | Test capacitor. |
| Wiring | Check the terminals. If loose, repair or replace. | |
| Refrigerating system | Check the system for a restriction. | |
| Insufficient cooling or heating | Air filter | If restricted, clean of replace. |
| Exhaust damper door | Close if open. | |
| Unit undersized | Determine if the unit is properly sized for the area to be cooled. | |
| Excessive noise. | Blower or fan | Check the set screw or clamp. If loose or missing, correct. If the blower or fan is hitting air guide, rearrange the air handling parts. |
| Copper tubing | Remove the cabinet and carefully rearrange tubing not to contact cabinet, compressor, shroud, and barrier. | |
| Auto air-swing fails. | Rotary switch. | Set the knob to HIGH COOL or LOW COOL while rocker switch is ON. |
| Wiring | Check terminals. If loose, repair or replace. | |
| Synchronous motor. | Check the synchronous motor for open circuit. |
LG TVNC362KLA0 air troubleshooting
| Case | Explanation |
| The air conditioner does not operate. | • Check room temperature setting? |
| • Check if circuit breaker is on? | |
| The room has a peculiar odor. | • Check that this is not a damp smell exuded by the walls, carpet, furniture, or cloth items in the room. |
| It seems that condensation is leaking from the air conditioner. | • Check the drain hose is connected tight or if indoor unit is installed even. |
| Air conditioner does not operate for about 3 minutes after turning on. | • This is the protector of the mechanism. |
| • Wait about 3 minutes and operation will begin. | |
| • About 3 minutes delay is applied to protect compressor from frequently on/off. | |
| Does not cool or heat effectively. | • Is the air filter dirty? |
| • Has the temperature been set correctly? | |
| • Are the indoor unit’s air inlet or outlet vents obstructed? | |
| The air conditioner operation is noisy. | • For a noise that sounds like water flowing. -This is the sound of refrigerant flowing inside the air conditioner unit. |
| • For a noise that sounds like the compressed air releasing into atmosphere. | |
| • This is the sound of the dehumidifying water being processed inside the air conditioning unit. | |
| Remote Controller display is faint, or no display at all. | • Are the batteries depleted? |
| • Are the batteries inserted in the opposite (+) and (-) directions? | |
| Crack sound is heard. | • This sound is generated by the expansion/contraction of the front panel, etc. due to changes of temperature. |