LG MULTI V Service Manual page 114

Self-diagnosis function
Error
Error Type
No.
Inverter Compressor DC
23
Link Low Voltage
n Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
Yes
Is inverter PCB assembly
power connection normal?
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
Error Point
DC Voltage isn't charged
after starting relay on
Check
L1(L)-L2(N) phase are 220 V(±10 %) or 240 V(±10 %)
No
(for 1 phase model)
→ Check connection condition and wiring if power is
abnormal
Check connection from terminal block to inverter PCB
No
assembly
→ wiring again if abnormality found
Check inverter PCB assembly IPM normality
No
→ Replace inverter PCB assembly
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Main Reasons
1. DC Link terminal misconnection/terminal
contact fault
2. Starting relay damage
3. Condenser damage
4. Inverter PCB assembly damage
(DC Link voltage sensing part)
5. Input voltage low
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