York IDM030B21E Series Service Manual page 42

TROUBLESHOOTING
Alarm
Code
l The RUN indicator (red) flashes.
l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code*
the model name*
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 DSW10-1P
(Terminating Resistance)
on O.U. PCB ON?
Yes
Is LED1 (red)
on O.U. PCB ON?
Yes
Disconnect connector
CN2 on O.U. PCB. *1)
Is LED3 (yellow)
on O.U. PCB ON?
No
Is DSW10-1P
(Terminating Resistance)
on O.U. PCB ON?
Yes
Reconnect connector
CN2 on O.U. PCB.
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3-20
Abnormal Communication between Indoor Units and Outdoor Units
1)
and the number of connected indoor units are displayed on the LCD, and the indoor
No
No Is the voltage between
faston terminal "R1"
and "S1"of O.U. PCB
correct*
Is PCN and CN1 on
O.U. PCB loose?
Is the fuse for
Yes
O.U. PCB blown?
No
*2): Correct Voltage
Power Supply
208-230V/60Hz
460V/60Hz
No
?
2
Yes
Yes
No
Yes
No
Faston Terminal
Voltage
208-230V
220V
Set it correctly.
Check the fuses of
outdoor unit power
supply.
Connect them correctly.
Replace fuse.
Faulty O.U. PCB
SM-16005-rev.2
1)
,
Outdoor
Unit