Johnson Controls CICM008B21S, Service Manual

Page: 42 / 152

3-20
SM-18003
TROUBLESHOOTING
l
The RUN indicator (red) flashes.
l
The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code
1
,
the model name
1
and the number of connected indoor units are displayed on the LCD, and the indoor
unit number and the alarm code are displayed on the 7-segment display of the outdoor unit PCB.
Note 1: Except for some models.
This alarm code is displayed when an abnormal condition continues for three minutes after normal
communication between indoor units and outdoor units. The abnormal condition continues for 30 seconds
even after the micro-computer is automatically reset. If communication failure occurs from the beginning,
the alarm code is displayed after 30 seconds from start up.
When fuses are blown, or the circuit breakers are activated, check the cause of overcurrent and take
necessary action.
Is LED3 (yellow)
on O.U. PCB ON?
No
No
Yes
Yes Yes
Is DSW10-1P
(Terminating Resistance)
on O.U. PCB ON?
Is LED1 (red)
on O.U. PCB ON?
Set it correctly.
No
Disconnect connector
CN2 on O.U. PCB.
1
Yes
Reconnect connector
CN2 on O.U. PCB.
Replace fuse.
No
Check the fuses of
outdoor unit power
supply.
Faulty O.U. PCB
Outdoor
Unit
To Next Page
No
No
Is the fuse for
O.U. PCB melted?
Yes
Yes
Is the voltage between
faston terminal "R1"
and “S1”of O.U. PCB
correct
2
?
Is DSW10-1P
(Terminating Resistance)
on O.U. PCB ON?
Is PCN and CN1 on
O.U. PCB loosened?
Connect them correctly.
Yes
No
Power Supply
for Outdoor Unit
Faston Terminal
Voltage
208-230V/60Hz 208-230V
460V/60Hz 220-230V
Note 2: Correct Voltage
Alarm
Code
Abnormal Communication between Indoor Units and Outdoor Units
O.U.PCB: Outdoor Unit PCB