Toshiba MM-A0280HT Service Manual page 73

Indoor remote controller
communication alarm
Are A, B, C internal
wires normal?
connection error?
Is group operation performed?
Is the unit setup No.1?
Does the indoor unit operate?
14
Troubleshooting
Diagnostic Procedure for Check Code
Check code
[99]
No
Yes
Yes
Is there a
No
Yes
No
No
Yes
No
Yes
Operation cause
1. Remote controller circuit connection error
2. Duplicated indoor No.1 units
3. Remote controller error
4. Indoor P .C. board error
Is SW01 set to No. 1 on
the master unit?
Yes
Is SW01 duplicated?
No
Does serial LED
(Green) D11 on the indoor
P .C. board flash?
No
Does serial LED
(Orange) D13 on the indoor
P .C. board flash?
No
74
Check connection of wiring.
Check indoor P .C. board.
If defective, replace.
No
Set SW01 to 1.
Yes
Avoid duplication of unit
setup to No.1.
Make unit setup No.1.
Yes
Check indoor P .C. board.
If defective, replace.
Yes
Check remote controller P .C. board.
If defective, replace.