LG Mini Split Error Codes
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Featured codes
- H30 — CH 30 (displayed H 30) is an uncommon LG display code. LG's official outdoor inverter
- F4 — F4 is listed by LG with low-refrigerant protection on models where it matches the CH3
- H05 — H05/CH05 means the indoor and outdoor units are not exchanging signals normally. LG's
- H53 — CH53 is listed by LG together with CH05 and E0 as an indoor-outdoor communication err
- H61 — CH61 is displayed to protect the unit from overheating. In cooling, the outdoor unit'
- H66 — CH66 is a function on LG inverter models that detects abnormal communication or bad p
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Safe checks with an external tool or supply
These pages list the check you can do from outside the unit, with an optional external tool or maintenance supply. None of them repair an internal fault.
- H30 — CH 30 on an LG mini split is a power/supply-side fault display that is only sparsely documented by LG: it appe…
- P4 — P4 means an over-temperature protection event on LG models that display P-codes instead of CH codes: the unit …
- H237 — CH237 points to an indoor/outdoor connection problem and can also occur when the outdoor unit has no power. Po…
Related troubleshooting guides
Manufacturer manuals
- LG CH 22 error code - SplitAtlas
- LG General Wall Mounted-Inverter Type service manual - CH23/CH28 troubleshooting (DC link volt. / power source checks)
- LG CH 237 - SplitAtlas (anchored to LG official support pages: indoor/outdoor connection problem)
- LG CH 238 - SplitAtlas (anchored to LG official support pages: indoor/outdoor connection problem)
- LG US official help library - CH01/CH02/CH06/CH12/CH21/CH23/CH26/CH29/E9 outdoor compressor or circuit board
- LG official Guide to Error Codes help library (official LG.com troubleshooting selector - CH 30 offered as a selectable code with generic reset guidance)
- LG US official help library - CH32/33/36/38/F4 refrigerant or compressor-related
- LG official help library (Kenya mirror of guide to error codes) - P7/P8/CH61/CH34 overheating checks
E codes
- LG E0 error code
LG E0 means an indoor/outdoor communication error (same fault group as CH05/CH53): the indoor and outdoor boards are not exchanging data. LG's own gui… - LG E6 error code
On LG units, E6 is grouped with CH10 as an indoor-unit fan fault - the indoor fan is restrained, locked, or its motor is not being driven correctly. P…
F codes
- LG F4 error code
On LG units, F4 points to low refrigerant levels (grouped by LG with CH32/33/36/38 on some models) or, on others, the CH90/91 test-run protection grou…
H codes
- LG H04 error code
LG H04/CH04 means a drainage problem: the drain pump is not operating, the float switch is open, or the unit detects water overflow in the drain pan. … - LG H05 error code
H05 on LG units (displayed as CH05) is a communication error between the indoor and outdoor units. Check the outdoor breaker and power both breakers o… - LG H07 error code
On LG multi-split / 2-in-1 systems, CH07 means connected indoor units are set to conflicting operating modes (for example one cooling while another he… - LG H10 error code
LG H10/CH10 means an indoor fan motor fault - the BLDC blower is locked, stalled, or not reporting rotation, so the unit shuts down. The fan usually t… - LG H21 error code
LG H21/CH21 means an outdoor inverter power-module (IPM) or compressor-drive overcurrent fault - the inverter detected excessive DC-peak or IPM curren… - LG H22 error code
CH22 on an LG mini split means compressor overcurrent. One breaker reset is safe; if CH22 returns or the breaker trips, leave the system off - compres… - LG H23 error code
LG H23/CH23 means an outdoor inverter DC-link voltage fault - the DC bus voltage between the rectifier and compressor inverter drifted out of the safe… - LG H237 error code
CH237 points to an indoor/outdoor connection problem and can also occur when the outdoor unit has no power. Post-2021 LG models display three-digit CH… - LG H238 error code
CH238 points to an indoor/outdoor connection problem and can also occur when the outdoor unit has no power. Post-2021 LG models display three-digit CH… - LG H24 error code
CH24 on an LG mini split is a pressure-switch trip (high- or low-pressure depending on generation). Clear the outdoor unit and reset once; pressure an… - LG H25 error code
LG H25 (CH25) means the outdoor unit supply voltage is outside the rated range (too high or too low). Reset once at the breaker; if H25 returns, stop … - LG H26 error code
LG H26/CH26 means the outdoor inverter compressor failed to start or is not providing rotation feedback - a compressor position/start fault. Power-cyc… - LG H27 error code
LG H27/CH27 means an inverter PSC/PFC overcurrent fault - the outdoor power-factor-correction or power-stage circuit detected excessive current and sh… - LG H29 error code
LG H29 (CH29) means abnormally high inverter compressor current, often from refrigerant overcharge, blocked refrigerant flow, or poor outdoor ventilat… - LG H30 error code
CH 30 on an LG mini split is a power/supply-side fault display that is only sparsely documented by LG: it appears in LG's official error-code selector… - LG H32 error code
LG H32/CH32 is a refrigerant-side protection code: LG's official guide groups CH32 with low-refrigerant codes (CH32/33/36/38/F4), and one LG support-t… - LG H33 error code
LG H33 (CH33) means excessive compressor discharge-temperature rise - a high discharge temperature protection fault, typically low refrigerant, blocke… - LG H34 error code
CH34 on an LG mini split means the system is overheating (high-pressure rise). Clean filters, open ventilation, reset once; a returning CH34 needs a t… - LG H35 error code
LG H35 (CH35) means excessive low-pressure drop - the low side fell too far, typically from refrigerant shortage, blocked flow, or a flow-control valv… - LG H38 error code
LG H38/CH38 means LG detected low refrigerant (often a leak) or, per LG's official pages, unstable power - a protection code to prevent damage. Turn t… - LG H53 error code
CH53 is LG's alternate communication-error display in the CH05/E0/CH53 group - the indoor and outdoor units are not exchanging signals normally. Power… - LG H54 error code
CH54 is LG's reverse-phase / power-supply detection error - typically after a power outage or electrical work, when one supply line is dead or phases … - LG H61 error code
CH61 is LG's overheat protection: the outdoor heat exchanger overheats in cooling or the indoor unit overheats in heating (often a clogged filter or b… - LG H66 error code
CH66 is LG's inverter-model protection for communication or piping-connection problems between indoor and outdoor units. If it appeared right after in… - LG H67 error code
CH67 (alternate display EF) means the outdoor-unit fan is restrained, blocked, or its motor is failing, so the outdoor coil cannot reject/absorb heat.… - LG H90 error code
CH90 is shown during LG's test-run/commissioning phase to protect the appliance (on some models displayed as F4). If it appears after installation or … - LG H91 error code
CH91 belongs to LG's CH90/CH91 test-run protection group (displayed as F4 on some models) - commissioning detected a condition that could damage the a… - LG H93 error code
CH93 means a communication problem between the LG indoor and outdoor units - often during the test run, and on post-2021 models also when the outdoor …
P codes
- LG P4 error code
P4 means an over-temperature protection event on LG models that display P-codes instead of CH codes: the unit is protecting itself from high outdoor t… - LG P6 error code
P6 means an over-temperature protection event on LG models that display P-codes instead of CH codes: the unit is protecting itself from high outdoor t… - LG P7 error code
LG P7 means overheating protection (shown instead of CH61 on some models): high outdoor temperature in cooling or high indoor temperature in heating. … - LG P8 error code
LG P8 means overheating protection (shown instead of CH61 on some models): high outdoor temperature in cooling or high indoor temperature in heating. …