![background image](http://html1.mh-extra.com/html/daikin/ftxn25l/ftxn25l_service-manual_4200014067.webp)
Service Diagnosis
59
L5
Description
IPM ABNORMALITY
Possible Root
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
*Remark:
Refer to Appendix A for installation condition check. (Page 77, item 6.6)
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.
Summary of Contents for FTXN25L
Page 2: ......
Page 4: ...Table of Contents ii 4 0 Wiring Connection 64 5 0 Refrigerant Diagram 70 6 0 Appendix A 72...
Page 88: ......