LG AC Error Codes & Troubleshooting Guide [Error Finder]

Look up your LG AC error code instantly. Find what it means, DIY fixes, and when to call a technician. Complete CH/C-code and number code list.

LG air conditioners display LG AC error codes whenever the system detects a problem with a sensor, PCB, compressor, fan, or the communication link between the indoor and outdoor units. Depending on your model, this shows up as a number (like 21 or 61), a CH/C-code (like CH01 or C5), or a blink pattern on the LED lights for units without a display screen.

Not every code means your AC is broken. Some, like P0 and LO, are normal operating states that need no action, while others call for an immediate power-off. This guide gives you an instant code lookup table, plain-English meanings for each fault, safe DIY checks you can try, and clear signals for when it’s time to call a professional.

LG AC Error Code Chart: Find Your Code Fast

Use Ctrl+F (or Cmd+F on Mac) to search this page for your exact error code.

Error Code	What It Means	DIY or Call Technician?
21	Compressor over current, IPM fault	Call Technician
22	Current over 14A (CT circuit)	Call Technician
23	DC link voltage low	Call Technician
24	Low/high pressure switch open	Call Technician
25	Abnormal AC voltage input	Call Technician
26	DC compressor position fault	Call Technician
27	PSC fault (reactor)	Call Technician
28	DC link voltage high	Call Technician
29	Compressor over current (30A+)	Call Technician
32	Discharge pipe temperature high (inverter)	Call Technician
33	Discharge pipe temperature high (compressor)	Call Technician
39	Communication error, PFC to inverter PCB	Call Technician
40	CT circuit malfunction	DIY Check
41	Discharge pipe sensor open/short (inverter)	DIY Check
44	Air sensor open/short	DIY Check
45	Condenser pipe sensor open/short	DIY Check
46	Suction pipe sensor open/short	DIY Check
47	Discharge pipe sensor open/short (compressor)	DIY Check
48	Discharge pipe and air sensor unplugged	DIY Check
51	Overload combination	Call Technician
52	Communication error, main to sub board	DIY Check
53	Communication error, indoor to outdoor	DIY Check
54	Reverse or missing phase, 3-phase supply	Call Technician
60	EEPROM checksum mismatch	Call Technician
61	Condenser pipe temperature too high	DIY Check
62	Heat sink temperature too high	Call Technician
63	Condenser pipe temperature too low	DIY Check
65	Heat sink sensor open/short	DIY Check
67	Outdoor BLDC fan lock	DIY Check
73	Inverter PFC input current over 48A	Call Technician
105	Communication error, main to fan board	DIY Check
CH01 / C1	Indoor room temperature sensor fault	DIY Check
CH02 / C2	Indoor coil (pipe) temperature sensor fault	DIY Check
CH03	Indoor fan motor error	DIY Check
CH04	Drain pump or water level error	DIY Check
CH05 / C5 / E53 / CH53 / CH93	Indoor to outdoor communication error	DIY Check
CH06	Indoor outlet pipe sensor fault	DIY Check
CH07	Compressor over current	Call Technician
CH08	Indoor fan connector error	DIY Check
CH09 / C9	Outdoor fan motor error	DIY Check
CH21	IPM or compressor over current	Call Technician
CH23	Low or high DC link voltage	Call Technician
C6 / CH6	Excessive current in DC power circuit	Call Technician
CH32	High compressor discharge temperature	Call Technician
CH34	High pressure protection	Call Technician
CH38 / P38 / 36	Low refrigerant or gas leak	Call Technician
CH39	Communication or PFC PCB error	Call Technician
CH40	Current transformer (CT) circuit error	DIY Check
CH44	Outdoor ambient temperature sensor fault	DIY Check
CH45	Condenser pipe sensor fault	DIY Check
CH46	Suction pipe sensor fault	DIY Check
CH47	Discharge pipe sensor fault	DIY Check
CH51	Discharge thermistor error	DIY Check
CH61	Condenser temperature too high	DIY Check
CH62	Heat sink temperature too high	Call Technician
CH63	Condenser temperature too low	DIY Check
CH65	Heat sink sensor open/short	DIY Check
CH67	Outdoor fan lock	DIY Check
CC	EEPROM error	Call Technician
CD	Inverter module error	Call Technician
P0	Power mode, not a fault	DIY Check
LO	Test mode, not a fault	DIY Check
P22	Excessive compressor current	Call Technician
P26	Inverter compressor speed error	Call Technician

How LG ACs Show Error Codes?

LG air conditioners communicate faults in two ways, depending on the model.

Units with a digital display show the error directly as a number or CH/C-code on the indoor unit screen or wall controller. You simply read it and match it to the chart above.

Older or basic models without a display, common on outdoor units, use LED blink patterns instead. Two LEDs on the outdoor PCB, LED1 (red) and LED2 (green), blink in a sequence.

How to count blinks:

Always power-cycle the unit once, off for a few minutes then restart, to confirm the code is genuine and not a one-off glitch before starting repairs.

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Common LG AC Error Codes Explained: Causes & Fixes

Indoor Sensor Errors (CH01/C1, CH02/C2, CH06)

Possible Causes:

• The room temperature, coil, or outlet pipe sensor has an open or short circuit.
• The sensor has come disconnected from the pipe or its mounting point.
• The connector is loose, or the wiring is broken.

What to Do:

• Check the sensor connector for a snug fit.
• Measure the sensor’s resistance against the expected value.
• Repair any damaged wiring, and replace the sensor if it tests faulty.

Indoor-Outdoor Communication Errors (CH05/C5/E53/CH53/CH93, Code 39, Code 52, Code 53)

Possible Causes:

• The communication cable is disconnected, damaged, or wired incorrectly.
• Wire terminals are burnt, corroded, or loose.
• The indoor or outdoor PCB has a communication failure, or earthing is poor.

What to Do:

• Check the communication wire for continuity end to end.
• Tighten or clean all terminal connections.
• Verify the indoor PCB’s output voltage and confirm proper earthing.

Fan Motor Errors (CH03, CH08, CH09/C9, Code 67)

Possible Causes:

• The indoor or outdoor fan motor is defective, or its connector is loose.
• Wiring is damaged, or the motor winding has gone open.
• The fan blade is jammed by dirt, debris, or a foreign object like a bird’s nest.

What to Do:

• Check that the fan rotates freely by hand.
• Inspect the wiring and test the motor winding.
• Clear any obstruction, and replace the motor if it stays faulty.

Compressor & IPM Errors (Code 21, Code 29, CH07, CH21, P22, P26)

Possible Causes:

• The compressor is overloaded, locked, or drawing high operating current.
• The IPM (inverter power module) has failed.
• Supply voltage is too low or too high.

What to Do:

• Check the power supply is within 220 to 240V.
• Measure compressor winding resistance for a short or open circuit.
• Inspect the IPM module and outdoor PCB. This is technician-level work due to the risk of compressor and inverter damage.

Voltage & Power Errors (Code 23, Code 25, Code 28, CH23, C6/CH6)

Possible Causes:

• Mains voltage is too low or too high.
• DC link voltage is abnormal.
• The outdoor PCB has a fault.

What to Do:

• Measure the input voltage at the wall.
• Install a voltage stabilizer if supply fluctuates often.
• Inspect the outdoor PCB for damage if voltage checks out normal.

Refrigerant & High-Temperature Protection Errors (CH38/P38/36, Code 32, Code 33, CH32, CH34, CH61, CH62, CH63)

Possible Causes:

• Refrigerant is leaking or low, or the system is overcharged.
• The condenser is dirty, or airflow is poor.
• Ambient temperature outside is unusually high.

What to Do:

• Leak test the entire refrigeration system.
• Clean the condenser coil and verify the refrigerant charge.
• Improve airflow around the outdoor unit. Refrigerant handling requires a licensed technician, so do not attempt this yourself.

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Sensor (Pipe, Suction, Discharge, Heat Sink) Errors (Code 41, Code 44, Code 45, Code 46, Code 47, CH44, CH45, CH46, CH47, CH51, CH65)

Possible Causes:

• The pipe, suction, discharge, or heat sink sensor has an open or short circuit.
• The connector is loose.
• Wiring is damaged.

What to Do:

• Inspect the sensor and its wiring closely.
• Measure resistance to confirm the sensor is faulty.
• Replace the sensor if it fails the resistance test.

PCB, EEPROM & Electronic Errors (Code 60, CH39, CH40, CC, CD)

Possible Causes:

• EEPROM checksum data is mismatched.
• The PCB has a communication failure or CT circuit malfunction.
• The IPM or inverter module has failed.

What to Do:

• Restart the unit to reset the checksum.
• Reseat all PCB connectors and check for damage.
• Reprogram or replace the PCB if the error persists. This is technician-level work.
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Drain System Error (CH04)

Possible Causes:

• The drain pump has failed.
• The float switch has activated due to water accumulation.
• The drain line is blocked.

What to Do:

• Check that the drain pump is running.
• Clear any blockage in the drain hose.
• Inspect the float sensor for proper operation.

Codes That Are Not Faults (P0, LO)

Possible Causes:

• P0 means the system is in power mode, a normal operating state.
• LO means the system is in test mode, also normal.

What to Do:

• No action is needed for either code.
• These clear on their own once the mode ends.

When an LG AC Error Code Means You Need a Technician?

Sensor and connector issues are often safe to check yourself. However, several fault categories involve high voltage, refrigerant, or specialised components, and should always be left to a licensed technician.

Call a professional if you see:

If your LG AC is out of warranty or its AMC has expired, Urban Service Plaza’s certified technicians in Kolkata can diagnose and repair these faults safely at your doorstep.

Key Takeaways

LG AC error codes fall into clear categories: sensor, communication, fan, compressor, voltage, refrigerant, and PCB faults. Most display as numeric or CH/C-codes, and the table above helps you identify any code in seconds.

Basic checks like a power cycle, filter clean, wiring inspection, or voltage check resolve many issues. But compressor, refrigerant, and PCB faults need a professional. If your code persists after basic troubleshooting, contact Urban Service Plaza for a proper diagnosis.