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MAXA BDS28A Spezifikationen Seite 31

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31
8.4.2.9 Communication malfunction (following AP1 for outdoor unit control board)
Main detection point:
● 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?
● Is there any damage for the indoor unit mainboard communication circuit? Is communication circuit damaged?
The flow chart for the malfunction detect:
Start
Did the unit operate normally
before the failure occurs.
Check the wiring of the
indoor and outdoor
units with reference to
the wiring diagrams
Are wires broken?
Check the communication
circuit of the outdoor unit
The communication circuit
is abnormal.
Replace the main board of
the indoor unit.
Replace the main board
(AP1) of the outdoor unit
If the fault is eliminated?
Is the connection right?
Correctly connect the
corresponding wires for
the indoor and outdoor
units with reference to
the wiring diagram.
If the fault is eliminated?
The AP1 voltage
detection circuit is
at fault
If the fault is
eliminated?
End
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
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