Troubleshooting Guide
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Only for training and service purposes
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25*
Master
251
Slave1
252
Slave2
253
Slave3
254
Input Voltage high/low
Error
No.
Error Type Error Point Main Reasons
Input voltage is over limited
value of the product (173V
or less, 289V or more)
1. Input voltage abnormal (R-N)
2. Outdoor unit Converter PCB assembly
damage (input voltage sensing part)
3. N phase line disconnection
n Error Diagnosis and Countermeasure Flow Chart
Yes
Yes
Recheck power and installation condition
Yes
Are there any power wire
connections normal?
No
Yes
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Is input voltage normal?
No
Check
R~S/S~T/T~R phase voltage is 380V 10%
R~N/S~N/T~N phase voltage is 220V 10%
→ Check connection condition and wiring if power is
abnormal
Is converter PCB assembly
bridge diode joining condition normal?
No
Check joining condition of converter PCB assembly and
bridge diode
→ joining again if abnormality found
Yes
Is DC_Link Wire connection
condition normal?
No
1.Check Comp PCB assembly P,N connector
connection condition
2.Check Converter PCB assembly P,N connector
connection condition
3. Check wire disconnection and wiring
→ Reassemble if abnormality found
Comp PCB LED display error
No
Replace Comp PCB assembly.
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