Troubleshooting for Outdoor Unit SiUS181305E
213 Troubleshooting
7.27 Signal transmission Error between Indoor Unit and
Outdoor Unit in the Same System
Error Code U9
Method of Error
Detection
Error Decision
Conditions
Supposed
Causes
Signal transmission error within system
Defective electronic expansion valve in indoor unit of other system
Defective indoor unit PCB in other system
Improper connection of transmission wiring between indoor and outdoor unit
Troubleshooting
Turn on all indoor units.
U9 has
been displayed for 2
minutes or more?
UA
blinks on the
other remote controllers
within the same
system?
A1
blinks on the
other remote controllers
within the same
system?
A9
blinks on the
other remote controllers
within the same
system?
U4
blinks on the
other remote controllers
within the same
system?
Re-diagnose by display after
passage of 2 minutes or
more.
Refer to troubleshooting for
UA error code.
Refer to troubleshooting for
U5 error code.
(R19192)
YES
NO
NO
YES
Refer to troubleshooting for
A1 error code.
NO
YES
Refer to troubleshooting for
A9 error code.
NO
YES
Refer to troubleshooting for
U4 error code.
YES
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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