Daikin VRVII - U7 Transmission Error (Across Outdoor Units)

Troubleshooting by Indication on the Remote Controller
300
3.64
U7
Transmission Error
(Across Outdoor Units)
Remote Controller Display
U7
Applicable Models
VRVIII and III-Q Series
Method of Error Detection
Micro-computer checks if transmission between outdoor
units is normal.
Error Decision Conditions
When transmission is not carried out normally for a
certain amount of time
Supposed Causes
 Improper connection of transmission wiring between
outdoor unit and external control adaptor for outdoor
unit
 Improper connection of transmission wiring between
outdoor units of multi outdoor unit connection
 Improper cool/heat selection
 Improper cool/heat unified address
(outdoor unit, external control adaptor for outdoor unit)
 Defective outdoor unit PCB
 Defective external control adaptor for outdoor unit