LG Multi V Water IV ARNU07GTU 2 Series Service Manual page 79

Error
Error Type
No.
25*
Master
251
Slave1
252
Input Voltage high/low
Slave2
253
Slave3
254
■ Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is converter PCB assembly
bridge diode joining condition normal?
Yes
Is DC_Link Wire connection
condition normal?
Yes
Comp PCB LED display error
Yes
Recheck power and installation condition
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Error Point
Input voltage is over limited
value of the product (173V
or less, 289V or more)
No
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T/T~R phase voltage is 380V 10%
No
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
Check joining condition of converter PCB assembly and
No
bridge diode
→ joining again if abnormality found
1.Check Comp PCB assembly P,N connector
No
connection condition
2.Check Converter PCB assembly P,N connector
connection condition
3. Check wire disconnection and wiring
→ Reassemble if abnormality found
No
Replace Comp PCB assembly.
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Troubleshooting Guide
Main Reasons
1. Input voltage abnormal (R-N)
2. Outdoor unit Converter PCB assembly
damage (input voltage sensing part)
3. N phase line disconnection
LGE Internal Use Only