LG MULTI V Service Manual page 116

Self-diagnosis function
Error
Error Type
No.
25
Input Voltage high/low
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is Inv. PCB
bridge diode joining condition normal?
Yes
Is DC_Link Wire connection
condition normal?
Yes
Inv. PCB LED display error
Yes
Recheck power and installation condition
Error Point
Input voltage is over limited
value of the product (142 V
or less, 310 V or more)
No
1. Check L1(L)-L2(N) wiring conditions
→ Rewire them if abnormality found.
Check
L1(L) – L2(N) phase voltage is 220 V(±10 %) or 240 V(±10 %)
No
→ Check connection condition and wiring if power is
abnormal
Check joining condition of Inv. PCB and bridge diode
No
→ joining again if abnormality found
1.Check Inv. PCB P,N connector
No
connection condition
2.Check Inv. PCB P,N connector
connection condition
3. Check wire disconnection and wiring
→ Reassemble if abnormality found
No
Replace Inv. PCB
- 116 -
Main Reasons
1. Input voltage abnormal L1(L)-L2(N)
2. Outdoor unit Inv. PCB damage (input volt-
age sensing part)
3. L2(N) phase line disconnection
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