PFC module protection
Check whether the
connecting line between
main board and the PFC
module(IPM module) is
connected tightly
Yes
Check whether the voltage
range of P-N on IPM module
is normal? DC277-356V for
18-27KBtu/h; DC277-410V
for 36-42KBtu/h
No
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
No
Connect it tightly, check
normal or not
Replace the outdoor main board
Yes
Yes
No
No
Replace the PFC module(IPM
module)
Trouble is solved
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