Error code reference

LG Air Conditioner Error Code 09

Indoor unit EEPROM error: error in transmission between microprocessor and EEPROM on the indoor unit PCB, or EEPROM damage.

SourceLG Air Conditioner - Service Manual: Outdoor Unit R410A (ARUN/ARUV)p. 89

LG codes LG air conditioner codes

Diagnostic procedure

The full 09 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

First diagnostic step

Replace the indoor unit PCB, then perform auto addressing and input central control address.

SourceLG Air Conditioner - Service Manual: Outdoor Unit R410A (ARUN/ARUV)p. 89

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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

42 manuals in the MyPros+ library document this code for LG air conditioner.

Models covered by the manuals that document this code

More models are covered than are listed here.

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The full 09 procedure

Where this code is documented

Models covered by the manuals that document this code

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