off.
P6
Check whether the voltage range
of P-N on IPM module is normal?
277-356VDC for 18-30KBtu/h; 277-
410VDC for 36KBtu/h
Check whether the connecting
wiring between main board and the
IPM module is connected tightly.
Yes
Yes
No
Check whether the
input power supply is
correct? 208-230V,
1PH, 60Hz
No
No
Correct the incoming
power problem, then
check whether the sys-
tem operates normally
Check whether the
power supply line is
connected correctly
and tightly.
No
Connect it cor-
rectly and tightly,
check ok or not?
Yes
No
Check whether
the lines in E-part
box are connected
tightly.
No
Connect it tightly,
check ok or not?
NoYes
Check whether the bridge recti-
ers are normal? Use the multi-
meter to measure the resistance
between each two terminals,
check whether there is the condi-
tion that value of resistance is 0.
Replace the
bridge rectiers.
No
Yes
Check whether the wir-
ing of each reactor is
correct? Check whether
the PFC module broken.
Replace the
wiring or reactor
or replace the
PFC module(for
M4OC-
36HRFN1-M)
No
No
Connect it
tightly, unit oper-
ates correctly?
No
Yes
Replace the IPM
module, check
whether the system
works normally.
No
Check if the outdoor
fan runs properly
or the outdoor unit
ventilation is good.
For AC fan models,
check whether the
resistance of the fan
motor is normal. If not,
replace the fan motor.
For DC fan models, re-
fer to the solution of fan
speed malfunction (E8)
. Find out the cause
and repair it.
Yes
No
Replace the main board;
check whether the sys-
tem operates normally?
No
Yes
Replace the compressor,
check whether the sys-
tem operates normally?
Problem Solved
Yes
Yes
Yes
Check whether the connecting wiring
to the compressor is connected cor-
rectly and tightly
Connect it
tightly, check ok
or not?
No
Yes
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