3-83
Check code
Operation cause
[b5]
Indoor outside input alarm
[b6]
Indoor outside interlock
1. External device error
2. Indoor main P.C. board (MCC-1361) error
Check code
Operation cause
[b7]
Secondly unit alarm in group
operating
Secondly unit error at group operating of the indoor unit
When a trouble occurred on any one of the secondly units operating in a group, an alarm is output to the
central control remote controller.
Using the remote controller of indoor unit, check a trouble on each secondly unit and take measures against
the error code.
Check code
Operation cause
[b9]
Indoor pressure sensor alarm
Output voltage error of indoor pressure sensor
There is an abnormal output voltage of indoor pressure sensor. Check disconnection of connector (CN23) of
indoor main P.C. board (MCC-1361) and output voltage of the sensor.
If the sensor is normal, replace the indoor main P.C. board. (MCC-1361)
YES
YES
NO
NO
Is outside device connected
to connector CN21 of indoor main
P.C. board (MCC-1361)?
Is outside device connected
Check cause of the operation.
Check outside device.
Defective Replacement
Check indoor main
P.C. board. (MCC-1361)
Defective Replacement
