7URXEOHVKRRWLQJ
2
6
Eliminate the malfunction
Eliminate the malfunction
Eliminate the malfunction
Eliminate the malfunction
End
no
no
no
no
no
no
no
no
yes
yes
yes
yes
yes
yes
yes
yes
yes
All the indoor units appear
communication malfunction
De-energize, check the connection
wire of indoor and outdoor unit and
the wire of the eletric box is
connected correctly
Connected correctly?
Reconnect according to
the wiring diagram
Connected correctly?
Reconnect according to
the wiring diagram
De-energize, check if the connection wire between
the outdoor mainboard and the filter board
according to the wiring diagram
The connection wire is broken?
Replace the
connection wire
Check if there is power input
bewtween the netrual wire and live
wire of the outdoor mainboard
There is power input?
Replace the filter board of
the outdoor unit
Resume communication?
Replace the outdoor
mainboard
Replace indoor
mainboard
Summary of Contents for DHM18CMB21S
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