Haier AU282AHBEA Service Manual page 299

8) Communication error between indoor and outdoor units
Confirm commumication failure
according to the fault code list
Confirm the fault indicator is
communication failure
Does indoor communication
indicator flash?
Is communication wire too
no
close to power cable, which
check the other
causes interference?
reasons
S should not share
a multicore cable
with L and N
yes
no
yes
yes
check if indoor/outdoor PCB fuse
and transformer are normal
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Are communication wire
S and supply wires L and
N properly connected?
Grounded well?
yes
if communication wire
is broken
no
yes
replace indoor PCB
no
if failure is eliminated
no
re-wiring
yes
re-wiring
change
no
defective parts
replace outdoor PCB