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Error code reference
LG Air Conditioner Error Code CH93
Communication error between indoor and outdoor units (alternate code).
SourceLG Wall Mounted Air Conditioner - Service Manual: General Inverter Typep. 51
Diagnostic procedure
The full CH93 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
Check connection status of ground wire; check power wire and communication wire (L & N) connections; measure resistance of communication line.
SourceLG Wall Mounted Air Conditioner - Service Manual: General Inverter Typep. 51
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
1 manual in the MyPros+ library documents this code for LG air conditioner.
Models covered by the manuals that document this code
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