SplitAtlas

Error-code hub

LG error codes

LG shows a two-digit code on the indoor unit display, and the first digit indicates the subsystem - 1- codes are indoor, 2- codes are outdoor or compressor, 5- and 6- codes are communication. The 36 codes below cover the ARTCOOL, Mega, Standard Efficiency and Multi F ranges. LGRED cold-climate models use the same set.

See LGmini-splits ->Common FirstStatus DisplaysError Codes
Status displays
15
Error codes
36

Unit applicability

Match your unit before reading the table

This table is sourced for Mega R-32. If your unit is a different generation or product line not named here, the same display code may vary by generation.

Mega R-326 models

Common codes first

Most broadly applicable documented codes

Ranking basis: we do not have failure-frequency telemetry. These are ordered by breadth of affected systems in the SplitAtlas catalog - the documented product line's published model count, whether the same code appears on more than one product line, and any manual applicability notes we hold. This is a breadth ranking, not a popularity claim.

CH 04

CH 04 means condensate water is not being removed the way the unit expects, or a full-water condition is being detected on models that use that display. If water is present at the indoor unit, treat it as a fault that can cause water damage.

AdvisoryTechnician
Breadth evidence
6 published catalog models on its documented product line.
Safe first check
Turn the unit off if water is visible. Check only the outside end of the drain for an obvious blockage or kink, then power cycle once at the breaker if you can do that safely. Do not open the indoor unit.
View the fix
CH 05

CH 05 means the indoor unit and outdoor unit are not exchanging the expected control signal. It often shows up right after installation or relocation if the connection is wrong, but LG also notes that normal-use faults can be temporary after unstable power.

AdvisoryTechnician
Breadth evidence
6 published catalog models on its documented product line.
Safe first check
Turn the system off, then power cycle once at the breaker or disconnect if you can do that safely. Do not open wiring covers or touch the communication cable.
View the fix
CH 07

CH 07 appears when connected LG indoor units are not set to compatible modes, such as one unit calling for heat while another calls for cooling or dry operation. The equipment is blocking operation because a shared system cannot heat and cool at the same time.

AdvisoryDIY
Breadth evidence
6 published catalog models on its documented product line.
Safe first check
Set every indoor unit on the same outdoor system to cooling, dry, or heating as a group. Fan-only and air-purification modes can be used without the same heat/cool conflict.
View the fix
CH 10

CH 10 means the indoor fan is being restrained or its fan motor is not operating properly. Without reliable indoor airflow, the unit cannot heat or cool safely.

AdvisoryTechnician
Breadth evidence
6 published catalog models on its documented product line.
Safe first check
Turn the system off. Look only for obvious external obstruction at the indoor outlet and remove nothing that requires opening the cabinet. If CH 10 returns, leave the system off.
View the fix
CH 21

CH 21 means the outdoor inverter power module or compressor drive has reported a fault. LG's support table points to compressor or inverter PCB failure, so this is not a homeowner repair.

AdvisoryTechnician
Breadth evidence
6 published catalog models on its documented product line.
Safe first check
Turn the system off and power cycle once at the breaker if you can do that safely. If CH 21 returns, do not keep resetting and do not open the outdoor unit.
View the fix
CH 22

CH 22 means the outdoor unit detected an overcurrent condition at the inverter compressor input. That is an electrical/compressor-protection fault, not something to troubleshoot inside the cabinet.

AdvisoryTechnician
Breadth evidence
6 published catalog models on its documented product line.
Safe first check
Turn the system off and power cycle once at the breaker if you can do that safely. If CH 22 returns or the breaker trips, stop using the system.
View the fix

Safe first checks

Checks you can do without opening the unit

These codes have homeowner-safe steps such as filters, airflow, condensate/drain checks, remote/controller items, or a single safe power reset. If the code returns, stop at the boundary in the card.

CH 34DIY part

Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once. If CH 34 returns, stop using the system normally.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
Read the full code guide
CH 61DIY part

Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once because LG notes CH 61 does not automatically clear.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
Read the full code guide
P4DIY part

Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
Read the full code guide
P6DIY part

Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
Read the full code guide

LG mini-splits

Use the LG catalog to connect these manual error codes to current model pages and replacement options.

See LGmini-splits ->

Status displays

CP

CP is a normal function display LG groups with Power Cooling. The unit is trying to cool faster than standard cooling, with fan speed and target temperature adjusted automatically.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn off Power Cooling, Jet Mode, or the equivalent turbo cooling setting if you want normal operation. Power Cooling only applies during cooling.
Status note
This is a normal function display, not a fault.
View the fix ->

7

When the display or remote shows 7, LG says the wall-mounted air conditioner's wind angle is set to indirect wind mode. It should show briefly and then return to the previous display.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Adjust the Comfort AIR or vertical louver setting if you do not want indirect airflow. No service is needed if the display clears normally.
Status note
This is a normal function display, not a fault.
View the fix ->

A1

LG's support article treats AI or A1 as the artificial-intelligence function display. In that mode, the unit automatically adjusts comfort settings, which can make temperature and airflow controls seem limited.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Switch from AI mode to normal cooling or heating mode if you want manual control of set temperature, fan, and airflow direction.
Status note
This is a normal mode display when it is AI/A1, not a fault.
View the fix ->

AI

AI is a function display, not a hardware fault. LG says this mode automatically controls temperature, airflow, and air direction, so normal temperature and airflow buttons may not behave the way you expect.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Switch from AI mode to normal cooling or heating mode if you want manual control of set temperature, fan, and airflow direction.
Status note
This is a normal mode display, not a fault.
View the fix ->

CLEAN FILTER

Clean Filter is a maintenance reminder based on recorded operating hours, not a sensor proving the filter is dirty. LG says the message can appear independently of actual filter condition.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Check the indoor filter for dust, clean it according to the owner's manual, and reinstall it dry. Depending on your remote type, the message may clear automatically after more operation or may need the remote's filter-display release/reset steps.
Status note
Clean the filter soon; this is routine maintenance, not an emergency.
View the fix ->

CO

Co is a normal display for LG's auto drying function on some models. LG says the product can show Co while it runs fan mode for a short time to dry the evaporator.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Let the auto drying cycle finish, or turn off the auto drying function from the remote/settings if you do not want it. The fan running briefly after shutdown can be normal.
Status note
This is a normal cleaning/drying status, not a fault.
View the fix ->

DEFROST

Defrost is a normal heating-cycle status. LG says the system may briefly run in cooling mode to warm the outdoor unit and melt frost while the indoor fan pauses.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Wait several minutes for defrost to finish. Keep snow and loose debris away from the outdoor unit, but do not chip ice from the coil or open the cabinet.
Status note
This is normal during heating in cold weather unless it never clears or heat does not resume.
View the fix ->

HI

Hi is a temperature message, not a failure code. LG says it appears when indoor temperature is very high, so the unit is reporting room conditions rather than a broken component.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Set the unit to cooling and give the room time to cool. If the display does not match the actual room or cooling never improves, schedule service.
Status note
This is a temperature status display, not a fault by itself.
View the fix ->

L

When the display or remote shows L, LG says the wall-mounted air conditioner's wind angle is set to indirect wind mode. It should show briefly and then return to the previous display.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Adjust the Comfort AIR or vertical louver setting if you do not want indirect airflow. No service is needed if the display clears normally.
Status note
This is a normal function display, not a fault.
View the fix ->

LO

Lo is a temperature message, not a failure code. LG says it appears when indoor temperature is very low, so the unit is reporting room conditions rather than a broken component.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Set the unit to heating if heat is needed and give the room time to warm. If the display does not match the actual room or heating never improves, schedule service.
Status note
This is a temperature status display, not a fault by itself.
View the fix ->

PO

PO is a normal function display LG groups with Power Cooling. The unit is trying to cool faster than standard cooling, with fan speed and target temperature adjusted automatically.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn off Power Cooling, Jet Mode, or the equivalent turbo cooling setting if you want normal operation. Power Cooling only applies during cooling.
Status note
This is a normal function display, not a fault.
View the fix ->

PREHEAT

Preheat is a normal heating startup status. LG says the indoor fan can pause while the indoor piping warms so the unit does not blow cold air into the room.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Wait several minutes for warm air to begin. If the room is already near the set temperature, raise the heating setpoint if you need more heat.
Status note
This is normal during heating startup unless it never clears or heat does not resume.
View the fix ->

SC

SC is a normal display for LG's auto drying function on some models. The unit may continue running the fan after you stop cooling so moisture is removed from the evaporator.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Let the auto drying cycle finish, or turn off the auto drying function from the remote/settings if you do not want it. The fan running briefly after shutdown can be normal.
Status note
This is a normal cleaning/drying status, not a fault.
View the fix ->

SP

SP is a normal function display LG groups with Power Cooling. The unit is trying to cool faster than standard cooling, with fan speed and target temperature adjusted automatically.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn off Power Cooling, Jet Mode, or the equivalent turbo cooling setting if you want normal operation. Power Cooling only applies during cooling.
Status note
This is a normal function display, not a fault.
View the fix ->

WATER DROP

The Water Drop indicator is used on some LG displays for preheating or defrosting during heating. LG says the indoor fan may pause and the wall-mounted louvers may close while the unit prevents cold drafts or melts outdoor frost.

Not an error
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Wait for the preheat or defrost cycle to finish. Keep the outdoor unit clear of loose snow and debris, but do not open panels or chip ice from the coil.
Status note
This is normal during heating unless it never clears or heat does not resume.
View the fix ->

All error codes

CH 04

CH 04 means condensate water is not being removed the way the unit expects, or a full-water condition is being detected on models that use that display. If water is present at the indoor unit, treat it as a fault that can cause water damage.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the unit off if water is visible. Check only the outside end of the drain for an obvious blockage or kink, then power cycle once at the breaker if you can do that safely. Do not open the indoor unit.
When to call a pro
Call a licensed HVAC technician if CH 04 returns, water is dripping, or the drain is not visible outside. Tell them LG identifies CH 04 as an indoor drain or full-water warning.
View the fix ->

CH 05

CH 05 means the indoor unit and outdoor unit are not exchanging the expected control signal. It often shows up right after installation or relocation if the connection is wrong, but LG also notes that normal-use faults can be temporary after unstable power.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off, then power cycle once at the breaker or disconnect if you can do that safely. Do not open wiring covers or touch the communication cable.
When to call a pro
Call a licensed HVAC technician if CH 05 returns after one reset or appeared right after installation. Tell them LG identifies CH 05 as indoor/outdoor communication.
View the fix ->

CH 07

CH 07 appears when connected LG indoor units are not set to compatible modes, such as one unit calling for heat while another calls for cooling or dry operation. The equipment is blocking operation because a shared system cannot heat and cool at the same time.

AdvisoryDIY
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Set every indoor unit on the same outdoor system to cooling, dry, or heating as a group. Fan-only and air-purification modes can be used without the same heat/cool conflict.
When to call a pro
Call for service only if CH 07 stays after all indoor units are set to the same mode and the system is power cycled once.
View the fix ->

CH 10

CH 10 means the indoor fan is being restrained or its fan motor is not operating properly. Without reliable indoor airflow, the unit cannot heat or cool safely.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off. Look only for obvious external obstruction at the indoor outlet and remove nothing that requires opening the cabinet. If CH 10 returns, leave the system off.
When to call a pro
Call a licensed HVAC technician if CH 10 returns, the indoor fan is noisy, or airflow is weak. Tell them LG identifies CH 10 as indoor fan lock or indoor fan motor fault.
View the fix ->

CH 21

CH 21 means the outdoor inverter power module or compressor drive has reported a fault. LG's support table points to compressor or inverter PCB failure, so this is not a homeowner repair.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and power cycle once at the breaker if you can do that safely. If CH 21 returns, do not keep resetting and do not open the outdoor unit.
When to call a pro
Call a licensed HVAC technician if CH 21 returns. Tell them LG identifies CH 21 as outdoor inverter compressor IPM failure involving the compressor or inverter PCB.
View the fix ->

CH 22

CH 22 means the outdoor unit detected an overcurrent condition at the inverter compressor input. That is an electrical/compressor-protection fault, not something to troubleshoot inside the cabinet.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and power cycle once at the breaker if you can do that safely. If CH 22 returns or the breaker trips, stop using the system.
When to call a pro
Call a licensed HVAC technician if CH 22 returns. Tell them LG identifies CH 22 as outdoor inverter compressor input overcurrent.
View the fix ->

CH 23

CH 23 means the outdoor inverter DC-link voltage is outside the expected range. LG's support table points to outdoor supply-voltage problems or an internal inverter circuit fault.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Power cycle once at the breaker if you can do that safely. If CH 23 returns, the breaker trips, or lights in the home are dimming/flickering, stop and call for service.
When to call a pro
Call a licensed HVAC technician or electrician if CH 23 returns. Tell them LG identifies CH 23 as outdoor inverter compressor DC-link high/low voltage.
View the fix ->

CH 237

LG explains that post-2021 models can display three-digit CH codes in sequence, such as CH 237. CH 237 points to an indoor/outdoor connection problem and can also occur when the outdoor unit has no power.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
If your model has an outdoor-unit power plug, make sure it is connected directly to a wall outlet. Check that the air-conditioner breaker is on. If the breaker will not stay on, do not keep trying.
When to call a pro
Call a licensed HVAC technician if CH 237 remains after power checks or appeared after installation. Tell them LG links CH 237 to indoor/outdoor connection and outdoor power supply.
View the fix ->

CH 238

LG explains that post-2021 models can display three-digit CH codes in sequence, such as CH 238. CH 238 points to an indoor/outdoor connection problem and can also occur when the outdoor unit has no power.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
If your model has an outdoor-unit power plug, make sure it is connected directly to a wall outlet. Check that the air-conditioner breaker is on. If the breaker will not stay on, do not keep trying.
When to call a pro
Call a licensed HVAC technician if CH 238 remains after power checks or appeared after installation. Tell them LG links CH 238 to indoor/outdoor connection and outdoor power supply.
View the fix ->

CH 24

CH 24 means the outdoor unit is reporting a high-pressure-switch issue. LG's support table lists either an outdoor pressure-switch fault or switch operation from overload.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and make sure the outdoor unit is not blocked by loose debris, snow, or stored items. Power cycle once if safe. If CH 24 returns, leave it off.
When to call a pro
Call a licensed HVAC technician if CH 24 returns. Tell them LG identifies CH 24 as outdoor high-pressure switch operation or pressure-switch failure.
View the fix ->

CH 25

CH 25 means the outdoor unit supply voltage is outside the rated range. The system may stop to protect the inverter and compressor electronics.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Power cycle once at the breaker if you can do that safely. If CH 25 returns, the breaker trips, or other home electrical symptoms are present, stop and call for service.
When to call a pro
Call a licensed HVAC technician or electrician if CH 25 returns. Tell them LG identifies CH 25 as outdoor input voltage high/low.
View the fix ->

CH 26

CH 26 means the outdoor inverter compressor did not start as expected. LG's support table lists outdoor compressor failure as the stated cause, with temporary operation error also possible.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and power cycle once at the breaker if you can do that safely. If CH 26 returns or the outdoor unit will not start, stop using it.
When to call a pro
Call a licensed HVAC technician if CH 26 returns. Tell them LG identifies CH 26 as outdoor inverter compressor start failure.
View the fix ->

CH 27

CH 27 means the outdoor power-factor or power-stage circuit detected overcurrent. LG's support table points to overload operation or damaged internal PCB components.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and power cycle once at the breaker if you can do that safely. If CH 27 returns or the breaker trips, stop using the system.
When to call a pro
Call a licensed HVAC technician if CH 27 returns. Tell them LG identifies CH 27 as PSC/PFC overcurrent.
View the fix ->

CH 29

CH 29 means compressor current is abnormally high. LG lists causes involving refrigerant amount or flow and outdoor ventilation, so homeowners should only correct safe airflow issues and then stop if the code returns.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off, then clear leaves, snow, or stored items around the outdoor unit without opening panels. Power cycle once if safe. If CH 29 returns, stop using the system.
When to call a pro
Call a licensed HVAC technician if CH 29 returns. Tell them LG identifies CH 29 as outdoor inverter compressor overcurrent with refrigerant-flow or outdoor-ventilation causes.
View the fix ->

CH 30

CH 30 is a high discharge-temperature protection code. LG's support table lists refrigerant shortage, blocked refrigerant flow, or a refrigerant-flow control valve fault as causes.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and do not keep resetting it if CH 30 returns. Do not add refrigerant, open panels, or try to service valves.
When to call a pro
Call a licensed HVAC technician if CH 30 appears. Tell them LG identifies CH 30 as compressor discharge-temperature excessive rise with refrigerant-flow causes.
View the fix ->

CH 32

CH 32 is a high inverter discharge-temperature protection code. LG's support table lists refrigerant shortage, blocked refrigerant flow, or a refrigerant-flow control valve fault as causes.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and do not keep resetting it if CH 32 returns. Do not add refrigerant, open panels, or try to service valves.
When to call a pro
Call a licensed HVAC technician if CH 32 appears. Tell them LG identifies CH 32 as inverter discharge-temperature high with refrigerant-flow causes.
View the fix ->

CH 33

CH 33 is a high discharge-temperature protection code. LG's support table lists refrigerant shortage, blocked refrigerant flow, or a refrigerant-flow control valve fault as causes.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and do not keep resetting it if CH 33 returns. Do not add refrigerant, open panels, or try to service valves.
When to call a pro
Call a licensed HVAC technician if CH 33 appears. Tell them LG identifies CH 33 as compressor discharge-temperature excessive rise with refrigerant-flow causes.
View the fix ->

CH 34

LG groups CH 34 with the CH 61 overheating-protection family on some models, and the Korean support label describes CH 34 as high-pressure rise. The unit is protecting itself from an operating condition that can damage the system.

AdvisoryDIY part
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once. If CH 34 returns, stop using the system normally.
When to call a pro
Call a licensed HVAC technician if CH 34 returns after airflow and filter checks. Tell them LG groups it with overheating/high-pressure protection.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
View the fix ->

CH 35

CH 35 means the system detected excessive low-pressure drop. LG's support table lists refrigerant shortage, blocked refrigerant flow, or a refrigerant-flow control valve fault as causes.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and do not keep resetting it if CH 35 returns. Do not add refrigerant, open panels, or try to service valves.
When to call a pro
Call a licensed HVAC technician if CH 35 appears. Tell them LG identifies CH 35 as excessive low-pressure drop with refrigerant-flow causes.
View the fix ->

CH 38

CH 38 means LG's controls detected that refrigerant may be low and displayed a protection code to prevent appliance damage. On an R32 system, treat this as a sealed-system problem for a licensed technician, not a homeowner repair.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off and write down CH 38. If it appeared after installation or relocation, contact the installer. Do not add refrigerant, open panels, or keep forcing operation.
When to call a pro
Call a licensed HVAC technician before using the system normally again if CH 38 remains or returns. Tell them LG identifies CH 38 as low refrigerant protection.
View the fix ->

CH 53

CH 53 is an alternate LG communication error display. It means the indoor and outdoor units are not communicating normally, so the system may stop heating or cooling even if the remote still responds.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off, then power cycle once at the breaker or disconnect if you can do that safely. Do not open wiring covers or touch the communication cable.
When to call a pro
Call a licensed HVAC technician if CH 53 returns after one reset or appeared right after installation. Tell them LG groups CH 53 with CH 05 and E0 communication faults.
View the fix ->

CH 54

CH 54 can appear after a power outage or electrical work. LG's support text points to reverse-phase detection, so this is electrical service territory if a breaker reset does not clear it.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Reset the air-conditioner breaker once if you can do that safely. If CH 54 appeared after electrical work, contact the electrical contractor or HVAC technician.
When to call a pro
Call a licensed HVAC technician or electrician if CH 54 repeats. Tell them LG identifies it as reverse-phase detection.
View the fix ->

CH 61

CH 61 is a protection code for overheating conditions. In cooling, LG points to high outdoor-unit temperature and poor ventilation; in heating, LG points to high indoor-unit temperature often caused by poor intake airflow or a dirty filter.

AdvisoryDIY part
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once because LG notes CH 61 does not automatically clear.
When to call a pro
Call a licensed HVAC technician if CH 61 returns after airflow and filter checks, if the outdoor unit is in an enclosed location that cannot be ventilated, or if heating/cooling remains weak.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
View the fix ->

CH 66

CH 66 is an inverter-model protection that LG says can detect communication trouble and piping-connection abnormalities between the indoor and outdoor units. It is especially important after new installation or relocation.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
If CH 66 appeared right after installation or relocation, do not keep trying to run the system; call the installer. During normal use, power cycle once at the breaker if you can do that safely.
When to call a pro
Call a licensed HVAC technician if CH 66 returns or appears after installation. Tell them LG identifies CH 66 as communication-line or piping-connection abnormality.
View the fix ->

CH 67

CH 67 means the outdoor fan is being restrained or its fan motor is not operating properly. The outdoor coil cannot reject or absorb heat normally without that fan.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off. Remove only leaves, loose debris, or snow outside the outdoor grille, then reset once. If CH 67 returns or the fan is damaged, stop using the unit.
When to call a pro
Call a licensed HVAC technician if CH 67 returns, the outdoor fan does not spin normally, or there is no obvious external blockage. Tell them LG identifies CH 67 as outdoor fan lock or outdoor fan motor fault.
View the fix ->

CH 90

CH 90 is typically shown during the test-run phase to protect the appliance. LG says installation or relocation cases need piping-connection inspection; during normal use, the same display may be temporary but should not be ignored if it returns.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
If CH 90 appears on a new or relocated system, contact the installer. During normal use, power cycle once if safe; if it returns, leave the system off.
When to call a pro
Call a licensed HVAC technician if CH 90 returns or appeared during commissioning. Tell them LG identifies CH 90 as test-run protection with piping/refrigerant-flow checks.
View the fix ->

CH 91

CH 91 is typically shown during the test-run phase to protect the appliance. LG says installation or relocation cases need piping-connection inspection; during normal use, the same display may be temporary but should not be ignored if it returns.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
If CH 91 appears on a new or relocated system, contact the installer. During normal use, power cycle once if safe; if it returns, leave the system off.
When to call a pro
Call a licensed HVAC technician if CH 91 returns or appeared during commissioning. Tell them LG identifies CH 91 as test-run protection with piping/refrigerant-flow checks.
View the fix ->

CH 93

CH 93 indicates communication trouble between the indoor and outdoor units. LG also notes that on models released after 2021, this can appear when the outdoor unit is not receiving power.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Make sure the outdoor unit power plug, if present, is fully plugged into a dedicated wall outlet and that the air-conditioner breaker is on. Power cycle once. If the breaker will not stay on, stop.
When to call a pro
Call a licensed HVAC technician if CH 93 returns, appears after installation, or the outdoor unit has no power. Tell them LG identifies CH 93 as indoor/outdoor communication, with outdoor-power checks on post-2021 models.
View the fix ->

E0

E0 is an alternate display LG groups with CH 05 and CH 53 for indoor/outdoor communication trouble. The system may stop because the indoor and outdoor units cannot coordinate operation reliably.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off, then power cycle once at the breaker or disconnect if you can do that safely. Do not open wiring covers or touch the communication cable.
When to call a pro
Call a licensed HVAC technician if E0 returns after one reset or appeared right after installation. Tell them LG groups E0 with CH 05 and CH 53 communication faults.
View the fix ->

E6

E6 is an alternate display for the indoor fan restraint or indoor fan motor fault group. The system may stop because it cannot confirm safe indoor airflow.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off. Look only for obvious external obstruction at the indoor outlet and remove nothing that requires opening the cabinet. If E6 returns, leave the system off.
When to call a pro
Call a licensed HVAC technician if E6 returns, the indoor fan is noisy, or airflow is weak. Tell them LG groups E6 with indoor fan lock.
View the fix ->

EF

EF is an alternate display for the outdoor fan restraint or outdoor fan motor fault group. The outdoor unit may stop because it cannot move air through the outdoor coil safely.

AdvisoryTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Turn the system off. Remove only leaves, loose debris, or snow outside the outdoor grille, then reset once. If EF returns or the fan is damaged, stop using the unit.
When to call a pro
Call a licensed HVAC technician if EF returns, the outdoor fan does not spin normally, or there is no obvious external blockage. Tell them LG groups EF with outdoor fan lock.
View the fix ->

F4

LG groups F4 with low-refrigerant protection on some models and also notes that some models display F4 for the CH 90/CH 91 test-run protection group. In either case, the official guidance points to installer or technician inspection if it persists.

Stop useTechnician
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
If F4 appears after installation or relocation, contact the installer. During normal use, turn the system off and do not keep resetting it if F4 reappears after one safe power cycle.
When to call a pro
Call a licensed HVAC technician if F4 returns or comfort is poor. Tell them LG lists F4 with low-refrigerant protection on some models and with CH 90/CH 91 test-run protection on others.
View the fix ->

P4

LG says some models may show P4 instead of CH 61. The unit is protecting itself from high outdoor temperature in cooling or high indoor temperature in heating.

AdvisoryDIY part
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once.
When to call a pro
Call a licensed HVAC technician if P4 returns after airflow and filter checks. Tell them LG groups P4 with CH 61 overheating protection on some models.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
View the fix ->

P6

LG says some models may show P6 instead of CH 61. The unit is protecting itself from high outdoor temperature in cooling or high indoor temperature in heating.

AdvisoryDIY part
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once.
When to call a pro
Call a licensed HVAC technician if P6 returns after airflow and filter checks. Tell them LG groups P6 with CH 61 overheating protection on some models.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
View the fix ->

P7

LG says some models may show P7 instead of CH 61. The unit is protecting itself from high outdoor temperature in cooling or high indoor temperature in heating.

AdvisoryDIY part
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once.
When to call a pro
Call a licensed HVAC technician if P7 returns after airflow and filter checks. Tell them LG groups P7 with CH 61 overheating protection on some models.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
View the fix ->

P8

LG says some models may show P8 instead of CH 61. The unit is protecting itself from high outdoor temperature in cooling or high indoor temperature in heating.

AdvisoryDIY part
Sourced Jul 2026
Applies to
Mega R-32
Homeowner fix
Open any outdoor-unit ventilation window or screen, clear objects around the outdoor unit, and clean the indoor filter. Then power cycle once.
When to call a pro
Call a licensed HVAC technician if P8 returns after airflow and filter checks. Tell them LG groups P8 with CH 61 overheating protection on some models.

Part route noted

No exact LG Mega R-32 parts page in the current catalog has a manufacturer-sourced OEM air filter number yet.

View sourced part route
View the fix ->