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Error code reference
LG Air Conditioner Error Code CH09
Indoor unit EEPROM error (EEPROM checksum discordance or EEPROM data read error).
SourceLG Ceiling Duct Air Conditioner - Service Manual (LBUH602RSA2)p. 61
Diagnostic procedure
The full CH09 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Error developed in transmission between microprocessor and EEPROM on PCB surface, or EEPROM damage; replace PCB.
SourceLG Ceiling Duct Air Conditioner - Service Manual (LBUH602RSA2)p. 61
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
4 manuals in the MyPros+ library document this code for LG air conditioner.
Models covered by the manuals that document this code
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