Troubleshooting Guide
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1. Power cable or communication cable is not
connected
2. Defect of outdoor Main PCB or
Comp1/Comp2 PCB
Error
No.
Error Type Error Point Main Reasons
Main PCB of Master unit
of Master unit canʼt
receive signal from
Comp1/Comp2 controller
Communication error
between
(Comp1/Comp2 PCB
‘ Main PCB)
52*
Master 521
Slave1 522
Slave2 523
Slave3 524
n Error diagnosis and countermeasure flow chart
Is communication
LED (Yellow) of
Comp1/Comp2 PCB
PCB on?
No
Re-connect communication cable
Is communication cable
connected correctly?
Yes
No
Re-connect communication cable
Is Main PCB normal?
Yes
No
Replace Main PCB
Replace Comp1/Comp2 PCB
* The method of checking Main PCB and Comp1/Comp2 PCB (If normal, communication LED blinks)
Yes
Communication Connector &
LED in Comp1 PCB
Communication Connector &
LED in Comp2 PCB
Comp1 Communication
Connector
Comp1 Communication
LED
Com2 Communication
LED
Comp2 Communication
Connector
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