U7 Transmission Error (Across Outdoor Units) - Daikin VRVII Manual

U7
3.64
(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
300
Troubleshooting by Indication on the Remote Controller
Transmission Error