Daikin RXYQ-TA Series Service Manual page 292

Troubleshooting by Error Code
Troubleshooting
279
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Ensure the sub code or
the lamp display of
monitor mode, and then
go to the following:
UA-17
Error code Sub code
UA-18
Error code Sub code
UA-20
Error code Sub code
UA-21
Error code Sub code
UA-31
Error code Sub code
SiUS341615E
Go to Diagnosis Flow-1.
(Connection of excess indoor
units)
Go to Diagnosis Flow-2.
(Connection of incorrect models
of indoor units)
Go to Diagnosis Flow-3.
(Improper combination of outdoor
units)
Go to Diagnosis Flow-4.
(Wrong connection)
Go to Diagnosis Flow-5.
(Multi system combination error)
Service Diagnosis