LG – InverterAC PCB

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InverterACPCB

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Error Code	Fault Meaning & Symptoms	Suspected PCB Component	Diagnostic Action	Lab Repair
CH05	LG Dual Inverter AC CH05 Error Code PCB Repair Indoor unit beeps and displays CH 05. Outdoor compressor remains completely silent.	Dual Inverter Control PCB & Optocoupler Line	Oscilloscope check on communication pin 3. Replace optocoupler ICs, check 300V PFC circuit, and inspect communication diode D01 & D02.	WhatsApp Repair Board
CH05	LG Dual Inverter AC CH05 Error Code PCB Repair Indoor unit beeps and displays CH 05. Outdoor compressor remains completely silent.	Dual Inverter Control PCB & Optocoupler Line	Oscilloscope check on communication pin 3. Replace optocoupler ICs, check 300V PFC circuit, and inspect communication diode D01 & D02.	WhatsApp Repair Board

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LG Inverter AC PCB Error Codes & Diagnostic Guide

Have a Dead or Error-Blinking Inverter AC PCB?

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