[E11 error]
Yes
Fault with the internal
board (MCC-1643)
→
Replace
Yes
No
No
No
Is the
connection for the
UART communication
connector (Internal board
CN521 red/Optional
board CN1 red)
normal?
Is connector
lead wire for the UART
communication
cut?
Red LED (LD1)
of external output board
not illuminated.
Red LED (LD1)
light on the external input/
output board flashes
on and off.
Red LED (LD1)
of external input/output
board blinks.
No
Yes
Fault with the external
input/output board
→
Replace
No
Lead wire is cut or fault
of input/output board.
Yes
Check the operating status.
Repair of connector
connection.
Yes
Replacement of the
connector’s lead wire.
8-5 Diagnostic Procedure for Each Check Code (Indoor Unit)
*Please refer to the multi outdoor unit service manual excluding these.
Check code
SVM-13085.indb 85
SVM-13085.indb 85
12/24/13 10:56 AM
12/24/13 10:56 AM
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Summary of Contents for Carrier MMU-AP0074HPUL
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