Indoor unit displays CH41 and may not operate correctly.

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Corrupted indoor PCB EEPROM, Incorrect indoor PCB installed, Wrong dip switch or configuration settings

How to Fix / Troubleshooting

Safety: Turn off power before accessing the indoor PCB.

Steps:

Check PCB part number: Confirm that the installed indoor PCB matches the exact LG model of the indoor unit.
Verify configuration: Compare dip switch or jumper settings to the service manual and correct any discrepancies.
Power reset: After adjustments, power off for 5–10 minutes, then on, and test.

Technician recommended: If CH41 persists, the indoor PCB EEPROM may be corrupted and the board should be replaced or reprogrammed by an LG-authorized technician.

Repair Difficulty

Hard 4/5

Required Part

Indoor Control PCB

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