LG Mini Split Error Codes: What CH05, CH38 and CH67 Mean

By Ray Bennett · Updated 2 October 2026 · 7 min read · Checked against the maker’s manual

LG Mini Split Error Codes: What CH05, CH38 and CH67 Mean

Short answer

LG shows a fault as CH and a number, and its own first step for nearly every code is to switch the power off for five minutes. CH05 and CH53 mean the indoor and outdoor units are not talking, CH07 two rooms in different modes, CH10 and CH67 a fan that cannot turn, CH61 running too hot, and CH38 low refrigerant, which no reset will fix.

LG mini splits report a fault as CH followed by a number, on the unit’s display, on a wired wall controller, or as a blinking light. LG’s own first step for nearly every code is the same five minute reset, and it tells you which codes belong to the installer instead.

Everything on this page comes from LG’s own material: the LG USA help library guide to air conditioner error codes, updated in February 2026, and the troubleshooting tables in LG’s Single Zone Art Cool Premier wall mounted installation manual. LG says its help guide covers all its air conditioners, so parts of it describe window and portable units rather than mini splits.

Before you start

What to carry: the remote, a torch and a pen. Five minutes, plus a five minute wait with the power off.

Gas or electric? A mini split is all electric, a heat pump that heats and cools.

Write the code down first. LG’s manual says the code stops showing once the fault clears, and if two faults happen at once, the lower number shows first.

Think about when it started. LG splits several codes by timing. Right after installing or moving the unit points at the installation, and during normal use it is often a power blip.

Two things LG says before any reset. A breaker that will not stay on is a stop. LG says that if the air conditioner’s breaker will not turn on, do not keep trying to reset it, and request service.

A refrigerant leak on a newer system. LG’s R32 units use a refrigerant LG describes as slightly flammable. If you suspect a leak, LG says to turn off anything with a flame, ventilate the area, contact the installer and not run the unit until the leak is repaired: signs the refrigerant is leaking.

The reset LG starts with

LG's first step for most codes: write it down, power off for five minutes, and see whether it comes back.

Check 1Free, ten minutes

Do the five minute power cycle

Power off. Turn off the breaker for the air conditioner, or unplug it if it has a plug. LG says the fault may be a temporary one caused by unstable power.

Wait five minutes. LG’s instruction for nearly every code is five minutes, not a quick flick of the switch.

Power on and start it with the remote. If the same code or symptom returns, LG says the unit needs a technician.

CH61 needs this reset. LG says the overheating code does not clear by itself, so the power cycle is how you clear it once the cause is fixed.

What each code means, from LG

LG’s help guide lists these codes, with the other names some models show them under.

Code	Also shown as	What LG says it means	Check first
CH04	FL	Condensate not draining from the indoor unit	Reset, then service
CH05	E0, CH53	Indoor and outdoor units not communicating	Reset
CH07	None	Units set to heating and cooling at the same time	Set every unit alike
CH10	E6	Indoor unit fan	Debris at the fan
CH32, CH33, CH36	None	Refrigerant or compressor problem: a power blip, or the outdoor unit’s compressor, drive or electronics	Reset; new install, installer
CH38	F4	Low on refrigerant	Installer or technician
CH54	None	Reverse phase, after a power cut or electrical work	Reset the breaker
CH61	P4, P6, P7, P8, CH34	Overheating: the outdoor unit in cooling, the indoor unit in heating	Clear the outdoor unit, clean the filter
CH66	None	Communication line or piping connection between the units	Reset; new install, installer
CH67	EF	Outdoor unit fan	Debris or snow at the fan
CH90, CH91	F4	Protection during the test run	Installer
CH93	None	Communication problem, often at the test run	The outdoor unit’s power
CH237, CH238	None	Outdoor unit has no power, on newer models with a power cord for each unit	The outdoor unit’s plug and breaker

The codes you can often clear yourself

Three families have a free check. CH38 is the one a reset or a clean will not fix.

Check 2Free, twenty minutes

Work the free check for your code

CH07: rooms in different modes. On a multi zone system, one outdoor unit cannot heat one room and cool another. LG says to set every unit to heating, or every unit to cooling or dehumidifying. Fan and air purifying modes can run alongside anything: why one head will not start on a multi zone system.

CH61 in cooling: the outdoor unit is too hot. LG says this often happens when hot air cannot get away from the outdoor unit. Clear anything piled up near it so the hot air can escape.

CH61 in heating: the indoor unit is too hot. LG names poor air intake, often a clogged or dirty filter. Clean the indoor unit’s filters: how to wash mini split filters.

CH10 and CH67: a fan. LG says to check for debris or snow around the indoor and outdoor fans and remove it. Switch off at the breaker before reaching near either fan.

CH93, CH237 and CH238: the outdoor unit’s power. Check the breaker for the outdoor unit and the disconnect switch beside it. LG adds that a plug-in unit belongs in a wall outlet, never a power strip.

CH05, CH53 and CH66 during normal use. LG treats these as a likely power blip first. Do the five minute reset.

The numbers on the board and the wired controller

LG’s installation manual lists the numbers behind the CH codes for its single zone wall units. They show on the indoor and outdoor control boards, on a wired wall controller if one is fitted, and in LG’s service software. LG’s example for reading the board lights is code 21: the green light blinks twice and the red light once.

Code	What LG’s manual says
1	Indoor room temperature sensor
2	Indoor coil inlet pipe sensor
4	Float switch, on units fitted with one
5	Indoor unit cannot talk to the outdoor unit
6	Indoor coil outlet pipe sensor
9	Indoor unit memory (EEPROM)
10	Indoor fan motor locked
12	Indoor coil middle pipe sensor
21	DC peak, a fault in the compressor’s power module
22	AC input current too high
23	DC link voltage too low
25	Supply voltage too low or too high
26	Compressor not turning, or locked
27	Current too high between the AC and DC stages
28	Compressor DC voltage too high
29	Compressor current too high
31	Current sensor reading too low
32	Compressor discharge pipe too hot
40	Current sensor disconnected or shorted
41	Discharge pipe sensor
44	Outdoor air sensor
45	Outdoor coil middle sensor
46	Suction line sensor
48	Outdoor coil outlet sensor, on the liquid line
53	Outdoor unit cannot talk to the indoor unit
60	Outdoor board memory (EEPROM)
61	Outdoor coil too hot
62	Outdoor board heat sink too hot
63	Outdoor coil pipe temperature too low
65	Heat sink sensor
67	Outdoor fan motor locked

LG notes that the outdoor unit’s codes show at both units, but the indoor unit’s own codes only show indoors.

When it needs a technician

Check 3

Know when to stop

CH38 and F4. Low refrigerant. After installing or moving the unit, LG sends you to the installer to check the charge and the pipe connections. During normal use, LG’s step is one power cycle, then LG support if it returns.

CH32, CH33 and CH36. LG’s help library groups them with CH38 and F4 as refrigerant or compressor problems, from a temporary power issue to a fault in the outdoor unit’s compressor, drive, protection circuit or electronics. The same steps apply: the installer if it is new, one five minute reset in normal use, then LG support.

CH05, CH53, CH66 or CH93 that come back. LG’s own step after the reset is service. Right after an installation, these point at the wiring or piping, and the installer should come back.

CH90 and CH91. LG says these appear during the test run to protect the unit. After installing or moving it, the pipe connections need checking by the installer.

21 to 32, 60 and 62. The compressor, its power electronics and the outdoor board. That is sealed system and high voltage work.

The sensor codes. 1, 2, 6, 12, 40, 41, 44 to 48 and 65 are sensors read as disconnected or shorted. Usually the sensor, sometimes the board.

Questions people ask

What does CH38 mean on an LG mini split?

Low refrigerant. If it appeared after installing or moving the unit, LG says to call the installer. If it appeared during normal use, switch off for five minutes, and contact LG support if it returns. A reset cannot put refrigerant back.

What does CH32 mean on an LG?

LG groups CH32 with CH33, CH36, CH38 and F4 as refrigerant or compressor problems. Right after installation, call the installer. In normal use, switch off for five minutes, and contact LG support if it returns.

What does CH05 mean?

The indoor and outdoor units are not communicating. Some models show it as E0 or CH53. LG’s step is the five minute power cycle, then service if it persists.

My LG shows CH34 or CH35.

LG’s guide groups CH34 with CH61, the overheating code, so clear the outdoor unit and clean the filters. LG’s guide does not list CH35, and for any code it does not list, LG recommends a technician’s inspection.

Why is the light on my LG mini split blinking?

LG says the indoor unit’s indicator light blinks at two second intervals when an error occurs. Look for the code on the display or the wired controller, then do the five minute reset.

My display says EO. Is that the E0 fault?

Not always. LG notes that on some models the indoor display shows EO while the kW Manager feature is running, which is not a fault.

Will the code clear by itself?

LG says a code stops showing once its fault is resolved. CH61 is the exception LG names: it needs a power cycle to clear.

Sources: LG USA help library "Guide to Error Codes" (updated 23 February 2026), LG's help library article on codes CH05, CH32 to CH38, F4 and CH66 to CH93 (August 2026), and LG's Single Zone Art Cool Premier Wall Mounted Installation Manual