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10.4.7
The communication fault between IPM and outdoor PCB
Outdoor display:
F3 LED1 flash 4 times
Method of
Malfunction
Communication is detected by checking the IPM module and the outdoor PCB
Detection
Malfunction
■ The outdoor PCB broken leads to communication fault
Decision
■ The IPM module broken leads to communication fault
Conditions
■ The outdoor PCB is broken
Supposed
■ The IPM module is broken
Causes
■
Communication wiring disconnected
Trouble
* Caution:
shooting
or else parts damage may be occurred.
Check whether the CN23 and CN24
terminals of the outdoor PCB and the
CN10 and CN11 terminals of the IPM
module are tightly connected.
Check whether the connection between
the power module and the outdoor P&N
line is tight
Are they good?
Electrify the machine again and turn it on.
Check whether the voltage between 1 and 2
of Terminal CN23 is about DC5V.
Check whether the voltage between2 and 3
of terminal CN23 is about DC15V.
Replace the outdoor PCB with a new
one
Be sure to turn off power switch before connect or disconnect connector,
NO
NO
40
Pull out and reinsert the terminals.
Replace connected wire
Malfunction unsolved
Replace the outdoor IPM
YES
module with a new one.
Service Diagnosis
1 2 3
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