Specifications

SiBE341027 Troubleshooting by Remote Controller
Service Diagnosis 167
2.37 Transmission Error (between Indoor and Outdoor Units
in the Same System)
Remote
Controller
Display
U9
Applicable
Models
All models of indoor unit
RQYQ-PY1B
Method of Error
Detection
Detect error signal for the other indoor units within the circuit by outside unit PCB.
Error Decision
Conditions
When the error decision is made on any other indoor unit within the system concerned.
Supposed
Causes

Transmission error within or outside of other system

Defective electronic expansion valve in indoor unit of other system

Defective PCB of indoor unit in other system

Improper connection of transmission wiring between indoor and outdoor unit
Troubleshooting
Continue the operation.
All the units are
indicating “
U9”.
Turn on all indoor units.
NO
Re-diagnose by display after passage
of 2 minutes or more.
“
U9” has been
displayed for 2
minutes or more.
NO
The outdoor unit PCB indicated by the
error code
U9 is normal.
Check for the indoor unit of other
system, and then conduct
troubleshooting by diagnosis
according to the Error Code
Flowchart.
YES
YES
Caution
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.