Daikin Aurora Series Service Manual page 274

Troubleshooting by Error Code
261
U4-03
Indication after
launch test
operation?
NO
Operate all indoor units.
Do all units display U9?
YES
Did 2 minutes or more
elapse after U9 is
displayed?
YES
YES
NO
NO
SiUS341802E
Check controller indoor units :
(1) Some error about
thermistor, or fan motor,
electronic expansion
valve, or defective PCB.
(2) Test operation was
interrupted by button BS1
"Mode".
Check all indoor error
indication.
Carry out the diagnosis again
after a lapse of 2 minutes or
more.
The PCB of indoor units
displaying U9 are normal.
Check for indoor units of
other systems to troubleshoot
them according to relevant
error codes.
Service Diagnosis