System Abnormality, Refrigerant System Address Undefined - Daikin RXYQ-TA Series Service Manual

Troubleshooting by Error Code
3.68 System Abnormality, Refrigerant System Address
Undefined
UH
Error Code
Applicable All indoor unit models
All outdoor unit models
Models
Method of Error Detect an indoor unit with no auto address setting.
Detection
Error Decision
The error decision is made as soon as the abnormality aforementioned is detected.
Conditions
Supposed
Causes
289
Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor
units
Defective indoor unit PCB
Defective outdoor unit PCB
SiUS341615E
Service Diagnosis