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N
r o
m
l a
e r
s
s i
a t
n
c
Unacceptable resistance
7.3.4 The IPM and outdoor PCB don't communicate or Related Abnormality
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
Troubleshooting
* Caution Be sure to turn off power switch before connect or disconnect connector,
1) Check whether Terminal CN23 and CN22 on the outdoor
mainboard CN10 and CN11 on IPM module
2) Check whether the connected wire between IPM and outdoor
Are they good?
Electrify the machine again and
turn it on, Check whether the
voltage between 1 and 2 of
Terminal CN22is about DC5V,
Check
whether
between2 and 3 of Terminal CN22
is about DC15V,
HSU24VHJ DB
e
Communication wiring disconnected
else parts damage may be occurred.
NO
YES
the
voltage
NO
NO
S
e
v
e
a r
k l
Ω to several MΩ ( )
Short (0 Ω) or open
Indoor Display
F3
1) Pull out and reinsert the terminals.
2) Replace connected wire
YES
Replace the outdoor mainboard with a new one
Service Diagnosis
Replace the outdoor IPM
module with a new one.
Domestic Air Conditioner
or
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