System Abnormality, Refrigerant System Address Undefined - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Troubleshooting by Error Code
4.49 System Abnormality, Refrigerant System Address
Undefined
UH
Error Code
Applicable All indoor units
Models
Method of Error An indoor unit without automatically set address is detected.
Detection
Error Decision
The error decision is made as soon as the abnormality aforementioned is detected.
Conditions
Supposed
Causes
207
Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor
units
Defective indoor unit PCB
Defective outdoor main PCB (A1P)
SiUS331604E
Service Diagnosis