Uh System Abnormality, Refrigerant System Address Undefined - Daikin VRVII Manual

Troubleshooting by Indication on the Remote Controller
UH
3.71
Refrigerant System Address
Undefined
Remote Controller Display
UH
Applicable Models
All indoor models
All outdoor unit series
Method of Error Detection
Detect an indoor unit with no address setting.
Error Decision Conditions
The error decision is made as soon as the abnormality
aforementioned is detected.
Supposed Causes
Improper connection of transmission wiring between
indoor-outdoor units and outdoor-outdoor units
Defective indoor unit PCB
Defective outdoor unit main PCB
System Abnormality,
343