Midea MOU-12HDN1, Service Manual

Page: 115 / 138

MLCAC-UTSM-2010-10 Troubleshooting
Outdoor Units 111
10.3.2.17. P6 malfunction (For three phases units)
P6 display
IPM module protection
Check whether the voltage
range of P-N on IPM module is
normal? DC 350-650V
Yes
Yes
No
Yes
Check whether the
input power supply is
correct? 380-415V, 3N,
50Hz
No No
Regulate it to correct,
then check whether the
system can work
normally?
Check whether the
power supply line is
connected correctly
and tightly
Yes
Connect it correctly
and tightly, check ok
or not?
No
Check whether the
connecting line between main
board and the IPM module is
connected tightly
Yes
Connect it tightly,
check ok or not?
No
No
No
Connect it well,
check ok or not?
Check whether the
connecting line of the
compressor is connected
correctly or tightly
Replace the IPM module,
check whether the system
can work normally?
No
No
Replace the main board;
check whether the system
can work normally?
No
Replace the compressor,
check whether the system
can work normally?
Yes
Yes
Check whether the
lines in E-part box are
connected tightly
Yes
Connect it tightly,
check ok or not?
No
No
Yes
No
Replace the bridge rectifiers
Check whether the bridge rectifiers
are normal? Use the multimeter to
measure the resistance between
each two terminals, check whether
there is the condition that value of
resistance is 0
Check whether the 3300µF/400V
electrolytic capacitor is normal?
Replace this electrolytic
capacitor
Yes
No
No
Yes
Trouble is solved