System Abnormality, Refrigerant System Address Undefined - Daikin VRV EMERION RXYQ-AATJA Service Manual

Troubleshooting by Error Code
3.73 System Abnormality, Refrigerant System Address
Undefined
Applicable
All indoor unit models
Models All outdoor unit models
UH
Error Code
Method of Error
System detects an indoor unit whose address is not defined by automatic address function.
Detection *Automatic address refers to the automatic designated address of indoor unit and outdoor unit
when connected to the power after installation or wiring replacement (with the RETURN (BS3)
button pressed for more than 5 seconds).
Error Decision
The error decision is made as soon as the abnormality aforementioned is detected.
Conditions
Supposed
 Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor
Causes
 Defective indoor unit PCB
 Defective outdoor unit main PCB (A1P)
367
units
SiUS342303E
Part 6 Service Diagnosis