SiUS281117
Troubleshooting by Remote Controller
172
Service Diagnosis
2.49 System is not Set yet
Remote
Controller
Display
UF
Applicable
Models
All indoor models
RZR, RZQ
Method of Error
Detection
On check operation, the capacity of indoor units in terms of transmission is not corresponding to
that of indoor units that have made changes in temperature.
Error Decision
Conditions
The error is determined as soon as the abnormality aforementioned is detected through
checking the system for any erroneous connection of units on the check operation.
Supposed
Causes
Improper connection of transmission wiring between indoor-outdoor units
Failure to execute check operation
Defective indoor unit PCB
Stop valve is not opened.
Troubleshooting
Note:
Wiring check operation may not be successful if carried out after the outdoor unit has been OFF
for more than 12 hours, or if it is not carried out after running all connected indoor units in the
fan mode for at least an hour.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Is indoor - outdoor
unit transmission
wiring normal?
Replace the indoor unit PCB.
Wiring check operation may
not have been carried out
successfully.
After fixing incorrect wiring,
press and hold the RESET
button on the master outdoor
unit PCB for 5 seconds.
∗
The unit will not run for up to
12 minutes.
YES
NO
YES
NO
NO
YES
Is the check operation
carried out?
Is indoor-outdoor unit
transmission wiring
normal?
Open the stop valve.
YES
NO
Are the stop valves
opened?
