Error code reference

LG Air Conditioner Error Code CH05

Communication error between indoor and outdoor units: operation indicator of indoor unit blinks 5 times and red indicator of outdoor unit blinks 5 times.

SourceLG Room Air Conditioner - Service Manual: LSN/LSU Seriesp. 59

LG codes LG air conditioner codes

Diagnostic procedure

The full CH05 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

Check connecting wires between indoor and outdoor units for connecting error and contact condition; ensure power is applied after connecting wires within 2 minutes.

SourceLG Room Air Conditioner - Service Manual: LSN/LSU Seriesp. 59

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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

27 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 CH05 procedure

Where this code is documented

Models covered by the manuals that document this code

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