LG AMNW07GDBL1 Service Manual page 61

Part 5. Trouble Shooting
Display
Title
code
25 Input Voltage high/low
■ Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is main PCB assembly power
connection normal?
Yes
Monitoring PCB LED display error
Yes
Recheck power and installation condition
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Only for training and service purposes
Cause of error
Input voltage is over limited
value of the product (140V
or less, 300V or more)
No 1. Check L/N/G wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T/T~R phase voltage is 220V 10%
No
→ Check connection condition and wiring if power is
abnormal
Check connection between main PCB assembly and bridge
No
diode(misconnection, disconnection)
→ wiring again if abnormality found
No
Replace main PCB assembly.
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Check point & Normal condition
1. Input voltage abnormal (R-S-T)
2. Outdoor unit main PCB assembly damage
(input voltage sensing part)
LGE Internal Use Only