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10.3.3.10 IPM module protection (ODU P6)
IPM module protection
Check whether the voltage range
of P-N on IPM module is normal?
DC277-356V for 18-28KBtu/h;
DC277-410V for 36-42KBtu/h
Yes
Check whether the connecting
line between main board and
the IPM module is connected
tightly
Yes
Check whether the connecting
line of the compressor is
connected correctly or tightly
Yes
Replace the IPM module,
check whether the system can
work normally?
No
Check if the outdoor fan
runs properly or the outdoor
unit ventilation is good.
No
Replace the main board; check
whether the system can work
normally?
No
Replace the compressor, check
Yes
whether the system can work
normally?
10.3.3.11 The cooling operation or heating operation does not operate.
No
Connect it tightly,
No
check ok or not?
No
Connect it well, check
No
ok or not?
No
Check whether the resistance of
the fan motor is normal. If not,
replace the fan motor.
For other
efer to the solution of
Yes
models, r
fan speed has been out of
control malfunction . F i n d o u t
the cause and have it solved.
Yes
Yes
49
Check whether the input
power supply is correct?
208-230V, 1N, 60Hz
Yes
Check whether the
power supply line is
connected correctly and
tightly
Yes
Check whether the lines
in E-part box are
connected tightly
Yes
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
Yes
Check whether the connecting line of
every reactor is normal? If the line is
broken, the resistance of the two ports is
∞（models except for M4OA-36HFN1-
Q,M4OD-28HFN1-Q,
Q）；Check whether the PFC module
broken
(for
M4OA-36HFN1-Q,M4OD-
28HFN1-Q,
M5OC-36HFN1-Q,M50D-
42HFN1-Q)
Trouble is solved
Regulate it to correct, then
No
check whether the system
can work normally?
No
Connect it correctly
No
and tightly, check ok
or not?
No
Connect it tightly,
No
check ok or not?
No
No
Yes
Replace the bridge rectifiers
M5OC-36HFN1-
No
Replace the connecting line or
reactor or replace the PFC
module(for M4OC-36HRFN1-
M,M50D-42HFN1-Q)
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