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10
3 .
7 .
T
h
e
o c
m
m
Outdoor display: LED1 flash 4 times
Method of
Communication is detected by checking the IPM module and the outdoor PCB
Malfunction
Detection
Malfunction
The outdoor PCB broken leads to communication fault
Decision
The IPM module broken leads to communication fault
Conditions
Supposed
The outdoor PCB is broken
Causes
The IPM module is broken
Communication wiring disconnected
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector,
else parts damage may be occurred.
1) Check whether plug of MODULE COM and MODULE POWER on the outdoor
PCB and IPM module is tight connected
2) Check whether the connection of P & N wire between IPM and outdoor is tight
Is the connection OK?
1.Check whether the voltage between 1
and 2 of Module Power
is about DC5V,
2.Check whether the voltage between2
and 3 of Module Power is about DC15V,
Replace outdoor PCB
u
i n
a c
o i t
n
a f
t l u
b
e
YES
NO
40
w t
e
e
n
P I
M
a
n
d
o
NO
1) Pull out and reinsert the terminals.
2) Replace connected wire
Malfunction unsolved
YES
Seivice diagnosis
u
d t
o
r o
P
C
B
Replace power module
Domestic air conditioner
or
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