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check if indoor/outdoor PCB fuse
and transformer are normal
if
failure is eliminated replace outdoor PCB
replace indoor PCB
if communication wire
is broken
Are communication wire
S and supply wires L and
N properly connected?
Grounded well?
Is communication wire too
close to power cable, which
causes interference?
Confirm the fault indicator is
communication failure
Does indoor communication
indicator flash?
check the other
reasons
no
yes
change
defective parts
re-wiring
Confirm commumication failure
according to the fault code list
5) Communication error between indoor and outdoor units - Wired controller shows
06
yes
yes
S should not share
a multicore cable
with L and N
no
no
no
no
no
yes
yes
yes
re-wiring
Is supply transformer or 7812
component in good condition?
yes
check if wiring
is correct
check if failure disappears after
changing transformer or PCB
no
no
check if failure disappears after
changing wired controller
yes
wired controller is
broken
6) Communication failure between wired controller and indoor PCB - Wired controller shows 07
or no display on wired controller
Confirm commumication failure
according to the fault code list
or no display
yes
yes
for some models, when powered on,
initialization will display 88, if initrialization
cannot finish, check indoor dip switch position
no
Is voltage between A and
B of wired controller 12V?
yes yes
yes
Is voltage between B
and C fluctuating?
replace PCB
no
no
no
check if the wired controller
can match with indoor PCB
replace wired controller
no
Is power just turned on?
check if the dip
switch position on
PCB is right
correct the position
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