[99] Remote Controller Serial Signal Circuit Alarm - Toshiba HFCR407C Service Manual

Diagnostic procedure for check code
Check code
[99]
Remote controller serial signal circuit alarm
Are A, B, C internal wires normal?
Yes
Is there a connection error?
No
Is group operation performed?
No
Is the unit set-up No.1?
Yes
Does the indoor unit operate?
Yes
Troubleshooting
Operation cause
1. Remote controller circuit connection error
2. Duplicated indoor No.1 units
3. Remote controller error
4. Indoor PC board error
No
Yes
Yes
Is SW01 set to No. 1
on the master unit?
Yes
Is SW01 duplicated?
No
No
No
Does serial LED (Green)
D11 on the indoor PC board
flash?
No
Does serial LED (Orange)
D13 on the indoor PC
board flash?
No
95
Check connection of wiring.
Check indoor PC board.
If defective, replace.
No
Set SW01 to 1.
Yes
Avoid duplication of unit set-up to No.1.
Make unit set-up No.1.
Yes
Check indoor PC board.
If defective, replace.
Yes
Check remote controller PC board.
If defective, replace.
14