LG Multi-Inverter Service Manual page 113

4. Trouble Shooting
Display
Title
code
Input voltage
25
I Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
Yes
Is Inverter PCB Normal?
Yes
Recheck power and installation condition
Tester
< CH25 Check Point >
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Only for training and service purposes
Cause of error
Abnomal Input Voltage
(R,S,T -N /140Vac¡é ,
300Vac ¡è )
R~S/S~T/T~R phase voltage is 400V ±10%
R~N/S~N/T~N phase voltage is 220V ±10%
No
¡ Check connection condition and wiring if power is
abnormal.
No
Replace inverter PCB assembly
- 112 -
Check point & Normal condition
Check the power source.
• Check the components.
<INVERTER PCB>
GND GND GND
INPUT VOLTAGE INV INPUT VOLTAGE INV INPUT VOL
<INPUT VOLTAGE Check Point>
AGE INV
LGE Internal Use Only