In the tables below you can find the list of possible troubles which you can encounter using your Lg heat pump. The information given there may be helpful in case of your heat pump not working properly.
The types of defects or breakdowns are various. There are detailed descriptions of possible problems and causes of heat pump not cooling or heat pump fan not spinning. Here you can find some questions which give you the idea what to investigate or to check before addressing to the specialists.
The Lg heat pump flash codes given in the tables and their descriptions are meant to give you the key to the possible problems you have with your heat pump. Do not try to do any repair if you are not a specialist!
Lg AHNW146A0 Heat Pump Troubleshooting
| Case | Explanation |
|---|
| AWHP does not operate. | • Have you made a mistake in timer operation? |
| • Has the fuse blown or has the circuit breaker been tripped? |
| 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. |
| AWHP does not operate for about 3 minutes when restart. | • This is the protector of the mechanism. |
| • Wait about three minutes and operation will begin. |
| Does not cool or heat effectively. | • The room may have been very hot when the AWHP was first turned on. Allow time for it to cool down. |
| • Has the setting temperature been set incorrectly? |
| The unit operation is noisy. | • Refrigerant flow sound |
| - While the system is being started or stopping, sound from the refrigerant flow may be heard. |
| • Sound for the indoor unit heat exchanger |
| - During the cooling operation, a sound may be heard from the indoor unit heat exchanger due to water freezing or melting. |
| • Water noise |
| - During starting or stopping of the unit, noise can appear in water piping |
| • During defrost |
| - Noise can appear in unit due to defrosting of water. |
| Steam is raised in outdoor unit. | • Steam from outdoor heat exchanger |
| - During defrosting operation, ice on the outdoor heat exchanger is melted, resulting in making steam. |
| Control panel display is faint, or no display at all. | • Has the circuit breaker been tripped? |
Lg ARWN038GA2 Heat Pump Troubleshooting
| Component | Phenomenon | Cause | Check method and Trouble shooting |
|---|
| Compressor | Not operating | Motor insulation broken | Check resistance between terminals and chassis |
| | Strainer clogged | Change strainer |
| | Oil leakage | Check oil amount after opening oil port |
| Stop during running | Motor insulation failure | Check resistance between terminals and chassis |
| Abnormal noise during running | R-S-T misconnection | Check compressor R-S-T connection |
| Outside EEV | Heating failure, frequent defrosting | Bad connector contact | Check resistance between terminals |
| No operation sound after switching ON the power supply | Coil failure | Service necessary |
| Heating failure, frozen outside heat exchanger part | EEV clogged |
| Low pressure error or discharge temperature error | EEV clogged | |
Lg AH Series Heat Pump 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. |
| Wire disconnected or connection loose | Connect wire. Refer to wiring diagram for terminal identification. Repair or replace loose terminal. |
| Will not rotate | Fan blade hitting shroud or cross flow fan hitting scroll. Realign assembly. |
| | Units using slinger ring condenser fans must have 1 /4 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. |
| | 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. |
| Turbo fan | 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. If wires are off, refer to wiring diagram for identification, and replace. Check wire locations. If not per wiring diagram, correct. |
| Rotary | Check for continuity, refer to the wiring diagram for terminal identification. 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.) |
| Pressure Switch | Check continuity of the pressure switch. Replace the pressure switch if circuit is open. |
Lg HS484 Heat Pump Troubleshooting
| Fault Codes | Cause |
|---|
| CH 01 | Indoor Air Thermistor Error |
| CH 02 | Indoor Coil Thermistor Error |
| CH 07 | Themostat Wiring Error |
| CH 09 | EEPROM Check Sum Error |
| CH 10 | Indoor Fan Error |
| CH 34 | High Pressure Switch Error |
| CH 44 | Outdoor Air Thermistor Error (PTHP Only) |
| CH 45 | Outdoor Coil Thermistor Error (PTHP Only) |
| CH 67 | Outdoor Fan Error |
Lg ARNU18GS3R1 Heat Pump Troubleshooting
| COMPLAINT | CAUSE | REMEDY |
|---|
| Compressor cycles on overload. | Voltage | Check the voltage. |
| 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. |
| Capacitor | Test capacitor. |
| Wiring | Check the terminals. If loose, repair or replace. |
| Refrigerating system | Check the system for 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. | Cross flow 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 | Carefully rearrange tubing not to contact, compressor, shroud, and barrier. |
Lg Multi IV Heat Pump 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/constriction of the front panel, etc. due to changes of temperature. |
Lg THERMA V Heat Pump Troubleshooting
| Error | Error Type | Error Point | Main Reasons |
|---|
| 1 | Indoor unit air sensor error | Indoor unit sensor is open/short | 1. Indoor unit PCB wrong connection
2. Indoor unit PCB failure
3. Sensor problem (main reason) |
| 01 (Fresh Air intake Unit) | FAU Outlet air sensor error |
| 2 | Indoor unit pipe inlet sensor error |
| 6 | Indoor unit pipe outlet sensor error |
| 17 (Fresh Air intake Unit) | FAU Inlet air sensor error |
