Code: CH67🔧 LG Mini Split

LG Mini Split CH67 Error Code: Outdoor Fan Lock (Meaning, Causes, Fixes)

Reviewed 2026-10-24 · Based on 3 manufacturer & service sources

What the code means

LG's R410A air conditioner service manual lists error 67 as "Fan Lock Error" ("Outdoor Unit Fan Lock" in its outdoor unit error table). The detection point is the outdoor fan speed: CH67 sets when the fan turns at 10 RPM or less for 5 seconds as the outdoor fan starts, or drops to 40 RPM or less after it has started. LG's support pages group CH67 with EF as outdoor unit fan errors, and CH10 with E6 as indoor unit fan errors, so a CH10 points you at the indoor head instead. When these fan components don't work properly, LG notes the air conditioner may stop operating.

Likely causes

Safe DIY checks

⚠ Before you start

Always kill power at the breaker or outdoor disconnect before touching the outdoor fan; it can start without warning when the unit is energized. LG warns not to disassemble the air conditioner or replace internal parts yourself, since doing so may cause fire, electric shock, serious injury or death. Inverter boards hold a high-voltage charge after power is removed, so board and motor testing is a job for a trained technician.

  1. Turn the unit off at the remote, then switch off the breaker or outdoor disconnect before you go near the fan.
  2. Look through the outdoor unit's fan grille. With gloves on, remove leaves, debris, snow or ice you can reach without opening the cabinet, and clear snow drifts around the unit.
  3. With power still off, check whether the fan blade turns freely by gently pushing it through the grille with a stick. LG's own check is that the fan turns by hand; if it is stiff, grinding or won't move, the motor needs service.
  4. Wait about five minutes, then restore power and run the unit again, as LG's reset steps say.
  5. If CH67 comes back, stop using the air conditioner and contact a licensed HVAC technician or LG Support.

🛠 When to call a pro

  • Checking the fan motor's mounting and fan locking first. LG's flowchart says to reassemble or replace parts if the motor assembly is abnormal.
  • Measuring the motor. LG's flowchart checks the resistance between each phase (U, V, W) of the outdoor fan motor terminals and the insulation resistance of those terminals, and replaces the fan motor if either is abnormal. The correct values are model-specific, so use the service manual for your unit.
  • Checking the wiring between the outdoor fan motor and the inverter board, including that the motor output terminal colors are matched, and reassembling the connection if it's wrong.
  • Replacing the inverter PCB assembly if the motor and wiring test good. LG's manual also gives a fan IPM diode-mode check for the board.
  • If everything tests normal, LG says to recheck the power supply and the installation conditions.

Parts that commonly fix it

Always match the part number to your exact model.

⚙

Outdoor fan motor

Only after a technician confirms the motor has failed its winding or insulation test; match the exact LG outdoor unit model number.

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Outdoor unit inverter board

Only if the motor and wiring test good; match the exact LG model and part number.

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Digital multimeter

Used by a technician to check fan motor phase resistance and wiring with the power off.

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Sources

  1. LG Air Conditioner Service Manual (R410A), error 67 Fan Lock Error, main reasons and flowchart (p. 135-136), outdoor fan lock check (p. 98)
  2. LG USA Support: How to Troubleshoot Error Codes CH10, CH67, E6, and EF on Your LG Air Conditioner
  3. LG USA Support: [LG Air Conditioner] Guide to Error Codes (CH67/EF outdoor fan)

Last reviewed 2026-10-24. Always confirm against the manual for your exact model number.