Daikin VRV X RXQ6-48ANR Series, Service Manual

Page: 264 / 297

Troubleshooting by Error Code SiME341909EA
258 Part 6 Service Diagnosis
5.61 System Not Set Yet
Applicable
Models
All indoor unit models
All outdoor unit models
Error Code
UF
Method of Error
Detection
On check operation, the number 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 and
outdoor-outdoor units
 Failure to execute check operation
 Defective indoor unit PCB
 Stop valve is not opened
Troubleshooting
Is
indoor-outdoor
and outdoor-outdoor unit
transmission wiring
normal?
Is
indoor-outdoor
and outdoor-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
RETURN
(BS3) button on the outdoor
unit main 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?
Open the stop valve.
YES
NO
Are the stop
valves opened?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.