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Service Diagnosis
49
L5
Description
IPM ABNORMALITY
Supposed Cause
1. Over current due to defective power transistor.
2. Over current due to wrong internal wiring.
3. Over current due to abnormal supply voltage.
4. Over current due to defective PCB.
5. Error detection due to defective PCB.
6. Over- current due to closed stop valve.
7. Over current due to compressor failure.
8. Over current due to poor installation condition.
9. Connection between main board and IPM board is not properly connect.
Troubleshooting
Stop valve
fully open?
No
Yes
Check the installation condition.
Check with the inverter analyzer.
Check the power supply voltage.
Turn off the power and turn it on
again to start the system. See if
the same error occurs.
No
Turn off the power and
reconnect the harnesses. Turn
on the power again and start
operation.
Turn off power and disconnect
the harnesses U, V and W.
Error again?
No
Yes
Yes
Any LED off?
Voltage as rated?
Yes
Correct the power supply or
replace the outdoor unit PCB.
Monitor the power supply
voltage and suction
pressures, and other factors
for a long term.
Fully open the stop valve.
No
Correct the power supply.
Replace the compressor.
*Remark:
Refer to Appendix A for inverter analyzer check procedures.(Page 63, item 6.5)
Refer to Appendix A for installation condition check. (Page 65, item 6.7)
Содержание ARXN25MV1B
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