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Self-diagnosis function
Error
Error Type
No.
25*
Master
251
Input Voltage high/low
Slave1
252
Slave2
253
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire
connections normal?
Yes
Is input voltage normal?
Yes
Is Inverter PCB assembly
bridge diode joining condition normal?
Yes
Inverter PCB LED display error
Yes
Recheck power and installation condition
Error Point
Input voltage is over limited
value of the product
No
1. Check R(L1)/(L2)/T(L3) wiring conditions
→ Rewire them if abnormality found.
Check
No
R~S/S~T/T~R phase voltage is 575 V±10%
→ Check connection condition and wiring if power is abnormal
No
Check bridge diode in IGBTM of Inverter PCB
No
Replace Inverter PCB assembly.
- 118 -
Main Reasons
1. Input voltage abnormal
2. Outdoor unit Inverter PCB assembly
damage (input voltage sensing part)
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