U7" Malfunction Of Transmission Between Outside Units - Daikin VRV - WII Service Manual

Troubleshooting by Indication on the Remote Controller
2.43 "U7"
Malfunction of Transmission between Outside Units
U7
Remote
Controller
Display
Applicable RWEYQ60, 72, 84MTJU
Models
Method of Microcomputer checks if transmission between indoor unit and remote controller is normal.
Malfunction
Detection
Malfunction When transmission is not carried out normally for a certain amount of time
Decision
Conditions
Supposed
Causes
216
Improper connection of transmission wiring between outside unit and external control adaptor
for outdoor unit.
Improper cool/heat selection
Improper cool/heat unified address (outside unit, external control adaptor for outdoor unit)
Defect of outside unit PC board (A1P)
Defect of external control adaptor for outdoor unit
Improper connection of transmission wiring between outside units of multi outside unit
connection.
SiUS30-604
Troubleshooting