LG AMNW07GDBL1 Service Manual page 82

Display
Title
code
DC Link High / Low Volt
23
WARNING
Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state
of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
■ Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal ?
Yes
Is Inverter PCB assembly
Power connection normal?
Yes
Is Inverter PCB Normal?
Yes
Recheck power and installation
condition
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Only for training and service purposes
Cause of error
• DC Link Voltage is
above 420Vdc
• DC Link Voltage is
below 140Vdc
No
Check L~N Voltage is 230V±15%
No
Check connection from terminal block to
Inverter PCB assembly CN(L), CN(N)
No
Replace inverter PCB assembly
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Part 5. Trouble Shooting
Check point & Normal condition
• Check CN_(L), CN_(N) Connection
• Check Input Voltage
• Check PCB DC Link voltage sensor parts
LGE Internal Use Only