59
Installation and Maintenance
Service Manual
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Malfunction indicator of outdoor unit
If the fault is eliminated?
If the fault is
eliminated?
If the fault is eliminated?
End
7
check points
of indoor mainboard
of outdoor mainboard(AP1)
ed
is
damage?
Start
Did the equipment operate
normally before the failure
occurs?
Check the wiring of the indoor
and outdoor units according to
the wiring diagram
Is the connection right?
Correctly connect the
corresponding wires for
the indoor and outdoor
units according to
the wiring diagram
Correctly connect the
wires for the indoor and
outdoor units according
to the wiring diagram
The communication
circuit is abnormal
Replace the mainboard
of indoor unit
Replace the mainboard
(AP1) of outdoor unit
Check if the controller connection wire
inside the electric box of indoor and
outdoor unit is loose
If the connection
wire inside electric box
is normal?
Check the communication
circuit of the outdoor unit
