MrCool DIY-MULTI2-18HP230C, Service Manual

Page: 127 / 156

 Troubleshooting 41 
8.9 (ODU)PC 0F(PFC module protection diagnosis and solution)
Description : Outdoor PCB detects PFC signal is low voltage or DC voltage is lower than 340V for 6s when quick check.
Recommended parts to prepare:
• Connection wires
• Outdoor PCB
• Inductance
• PFC circuit or IPM module board
Troubleshooting and repair:
PFC module protection
PFC module protection
Check whether the
connecting line between
main board and the PFC
module is connected tightly
Check whether the
connecting line between
main board and the PFC
module is connected tightly
Yes
Measure whether the voltage
between P and N is normal
refer to the Appendix ？
Measure whether the voltage
between P and N is normal
refer to the Appendix ？
No
Check whether the
inductance of PFC module is
good? If the inductance is
good, the resistance of the
two ports is 0
Check whether the
inductance of PFC module is
good? If the inductance is
good, the resistance of the
two ports is 0
Yes
Replace the inductance
Replace the inductance No
Connect it tightly, check
normal or not
Connect it tightly, check
normal or not
Replace the outdoor main board
Replace the outdoor main board Yes
Yes
No
No
Replace the PFC module
Replace the PFC module
Trouble is solved
Trouble is solved