Troubleshooting Guide
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Only for training and service purposes
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1. Wrong wiring between Converter PCB and
Fan PCB
2. Fan PCB assembly defect
3. Reactor terminal contact defect
4. DC link terminal wiring/contact defect
5. Bridge diode defect
Error No. Error Type Error Point Main Reasons
Fan PCB DC link voltage supplied
below 380V
Fan DC Link Low
Voltage Error
107＊
Master
1071
Slave2
1072
Slave3
1074
n Error Diagnosis and Countermeasure Flow Chart
1. Check DC_Link Wire connection
2. DC_Link
→ Replace wire if abnormality found
Measure DC_Link voltage
→ Check Converter PCB if voltage is below 380V
Yes
No
Yes
No
Is wiring between fan motor
and PCB normal?
Is DC_Link voltage normal?
Yes
Is Fan PCB assembly normal?
Recheck power and
installation condition
No
DC voltage connection
Replace fan PCB assembly
DC Volt connected
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