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138 PB
TROUBLESHOOTING
Communication malfunction: (following AP1 for outdoor unit control board)
Fault diagnosis process:
Y
N
Y
N
N
Y
N
(8) Communication malfunction: (following AP1 for outdoor unit control board)
Mainly detect:
Is there any damage for the indoor unit mainboard communication circuit? Is communication circuit damaged?
Detect the indoor and outdoor units connection wire and indoor and outdoor units inside wiring is connect well or not, if is
there any damage?
N
Y
N
Y
N
Y
Y
Start
The AP1 voltage
detection circuit
Did the equipment operate
normally before the failure
occurs?
is at fault
units
Are wires broken?
Check wiring inside of
the indoor and outdoor
If the fault is eliminated?
Check the communication
circuit of the outdoor unit
The communication
circuit is abnormal
End
If the fault is eliminated?
Replace the main board
of
the indoor unit
If the fault is eliminated?
Replace the main board
AP1 of the outdoor unit
Is the connection right?
wiring diagram
Check the wiring of the indoor and
outdoor units with reference to the
Correctly connect the
corresponding wires for
the indoor and outdoor
units with reference to
the wiring diagram
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