40
TROUBLESHOOTING CONTINUED
(7) Communication malfunction
Main checking points:
Is the indoor mainboard or outdoor main board broken
Is the connection wire between the indoor unit and outdoor unit connected correctly at both ends
Flow chart:
Eliminate the malfunction
End
Communication malfunction of some
indoor units
De-energize and make sure all
connections at both ends are
correct and tight
no
no
no
Connected correctly
Reconnect according to
the wiring diagram
yes
yes
yes
De-energize, exchange the signal wire of a bad unit with
one from a good unit. Wait 3 minutes for restart.
The bad indoor unit resumes
normal function
Replace outdoor
mainboard
Replace the mainboard of the
bad indoor unit
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