LG ARUN Series Service Manual page 92

Troubleshooting Guide
Error
Error Type
No.
25*
Master
Input Voltage high/low
251
Slave
252
I Error Diagnosis and Countermeasure Flow Chart
Is input voltage normal?
Yes
Is inverter PCB assembly normal?
Yes
Recheck power and installation condition
* Measuring input voltage
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Only for training and service purposes
Error Point
Input voltage is over limited
value of the product (173V
or less, 289V or more)
Check
R~S/S~T/T~R Phase voltage :460V±10% (3Ø 460V)
No
¡ Check connection condition and wiring if power is
abnormal
No
Replace inverter PCB assembly
* Inverter PCB assembly power wiring
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Main Reasons
1. Input voltage abnormal (R~S/S~T/T~R)
2. Outdoor unit inverter PCB assembly dam-
age (input voltage sensing part)
208/230V±10% (3Ø 208/230V)
LGE Internal Use Only