Daikin SkyAir FHQ24PVJU - System Not Set

Troubleshooting by Error Codes SiUS281811EA
290 Part 6 Service Diagnosis
4.58 System Not Set
Error Code UF
Applicable
Models
All indoor units
All outdoor units
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
 Failure to execute check operation
 Defective indoor unit PCB
 Stop valve is not opened
Troubleshooting
Caution
Is
indoor-outdoor unit
transmission wiring
normal?
Is
indoor-outdoor unit
transmission wiring
normal?
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Press RETURN (BS3) button
on outdoor unit PCB for 5
seconds or longer.
∗ No operation for max. 12
minutes.
After fixing incorrect wiring,
press and hold the RETURN
(BS3) button on the master
outdoor unit PCB for 5
seconds.
∗ The unit will not run for up to
12 minutes.
YES
YES
NO
YES
NO
NO
NO
YES
Is the check
operation carried
out?
Open stop valve.
Replace the indoor unit PCB.
Normal
YES
NO
Are the stop valves
opened?
Are there any other
errors?
Perform test operation again and
press RETURN (BS3) button.