Midea M2OC-14HRDN1 Technical & Service Manual page 34

8.3.12 PFC module protection
Check the voltage of power supply, if the voltage
is about 220V, turn off the power supply and
turn it on again after 1 minute
Does the unit work
normally ?
Check whether the
power supply of bridge
rectifiers input port is
normal.
Check whether the power
supply of bridge rectifiers
output port is 325VDC
Check
voltage between P and
N port in IPM is 380V.
Check
wiring between
and PFC module is
normal.
Replace outdoor e-box.
No
Yes
Yes
whether the
Yes
whether the
PCB
Yes
No
Replace the
outdoor PCB
No
Replace bridge rectifiers
Check whether
the PFC
No
inductance is
normal.
Yes
Replace the PFC inductance
ODMI-1103-A
No
Replace PFC