53
Troubleshooting
Diagnostic procedure for check code
Check code Status of air conditioner Operation cause
[99] Indoor unit stops 1. Remote controller circuit connection error.
Remote controller serial 2. Duplicated indoor No.1 units.
signal circuit alarm 3. Remote controller error.
4. Indoor PC board error.
Are A, B, C internal wires normal? Check connection of wiring.
j
h
No
Ye s
Is there a connection error?
Ye s
No
Set SW01 to 1.
Correct switch SW01.
h
h
Is SW01 set to No. 1 on
the master unit?
Is SW01 duplicated?
Check indoor PC board.
If defective, replace.
No
No
Ye s
Ye s
j
Does the indoor unit operate?
Is SW01 set to No. 1?
Make unit set-up No.1.
j
h
No
Ye s
j
j
Is group operation performed?
Ye s
No
h
j
Check indoor PC board.
If defective, replace.
Check remote controller.
If defective, replace.
h
h
Does serial LED (Green)
D15 on the indoor PC board
flash?
Does serial LED (Orange)
D14 on the indoor PC
board flash?
No
Ye s
No
Ye s
j
j
No
j
Ye s
g
i
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