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replace outdoor PCB
check if indoor/outdoor PCB fuse
and transformer are normal
if failure is eliminated
replace indoor PCB
if communication wire
is broken
Are communication wire
P, Q connected contrarily
and supply wires L and N
properly connected?
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
4) Communication error between indoor and outdoor units
yes
yes
S should not share
a multicore cable
with L and N
no
no
no
no
no
yes
yes
yes
re-wiring
Confirm the failure according to
the fault code list
yes
no
yes
There is short-time fault readout. It's
normal. Fault readout disappears
after a while
Is indoor unit changing from heating
cycle to cooling cycle or from cooling
cycle to heating cycle?
Are indoor units in same
operation mode?
5) Fault in operation mode (heating cycle, cooling cycle and ventilating)
Adjust indoor units to
operate in same mode
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