3-20
SM-16005-rev.2
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.
*1) Except for some models.
H
When fuses are blown, or the circuit breakers are activated, check the cause of overcurrent and take
necessary action.
H
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.
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 blown?
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 loose?
Connect them correctly.
Yes
No
Power Supply
Faston Terminal
Voltage
208-230V/60Hz
208-230V
460V/60Hz
220V
*2): Correct Voltage
Alarm
Code
Abnormal Communication between Indoor Units and Outdoor Units
Summary of Contents for IDM030B21E Series
Page 2: ......
Page 10: ...viii SM 16005 rev 2...
Page 14: ......
Page 15: ...SM 16005 rev 2 1 1 INSTALLATION 1 Installation...
Page 19: ...SM 16005 rev 2 2 1 OPERATION 2 Operation...
Page 22: ......
Page 23: ...SM 16005 rev 2 3 1 TROUBLESHOOTING 3 Troubleshooting...
Page 70: ......
Page 71: ...SM 16005 rev 2 4 1 MAINTENANCE 4 Maintenance...
Page 130: ......
Page 131: ...SM 16005 rev 2 6 1 FIELD WORK INSTRUCTIONS 6 Field Work Instructions...
Page 140: ...6 10 SM 16005 rev 2 FIELD WORK INSTRUCTIONS 6 8 Mollier Chart for R410A f t 3 l b...
Page 141: ...SERVICE PARTS LIST SM 16005 rev 2 7 1 7 Service Parts List...
Page 143: ......
Page 144: ...2016 Johnson Controls Inc SM 16005 rev 2 Code No LIT 12012293 Revised February 2019...