Diagnostic Procedure For Each Check Code (Indoor Unit) - Toshiba MMF-AP0156H-E (TR) Service Manual

8-5. Diagnostic Procedure for Each Check Code (Indoor Unit)

* Please refer to the multi outdoor unit service manual excluding these.
Check code
[E11 error]
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.
Check the operating status.
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
– 78 –
Repair of connector
connection.
Replacement of the
connector fs lead wire.
Lead wire is cut or fault
of input/output board.
Fault with the external
input/output board
→ Replace
Fault with the external
input/output board
→ Replace