LG ACHH Series Manual page 67

Error
Error Type
No.
25
Input Voltage high/low
(251)
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is inverter PCB assembly power
connection normal?
Yes
INV. PCB LED display error
Yes
Recheck power and installation condition
Error Point
Input voltage is over limited
value of the product (304 V
or less, 536 V or more)
No
1. Check R/S/T wiring conditions
→ Rewire them if abnormality found.
Check R~S/S~T/T~R phase voltage 380-415 V ± 10 %,
No R~N/S~N/T~N phase voltage 220 ± 10%
→ Check connection condition and wiring if power is
abnormal
Check connection between inverter PCB assembly and
No
bridge diode(misconnection, disconnection)
→ wiring again if abnormality found
No
Replace inverter PCB assembly.
- 67 -
Main Reasons
1. Input voltage abnormal (R-S-T)
2. Outdoor unit inverter PCB assembly dam-
age (input voltage sensing part)
Error code check