Indoor Unit: Malfunction Of Transmission Between Outdoor Units; U7" Indoor Unit: Malfunction Of Transmission Between; Outdoor Units - Daikin VRV III RXYQ5-54PY1 Service Manual

Troubleshooting by Indication on the Remote Controller
3.46 "U7"
Indoor Unit: Malfunction of Transmission Between

Outdoor Units

U7
Remote
Controller
Display
Applicable All models of indoor units
Models
Method of Microcomputer checks if transmission between outdoor units.
Malfunction
Detection
Malfunction When transmission is not carried out normally for a certain amount of time
Decision
Conditions
Supposed
Causes
284
Improper connection of transmission wiring between outdoor unit and external control
adaptor for outdoor unit
Improper connection of transmission wiring between outdoor units.
Improper cool/heat selection
Improper cool/heat unified address (outdoor unit, external control adaptor for outdoor unit)
Defect of outdoor unit PC board (A1P)
Defect of external control adaptor for outdoor unit
Si34-601A
Troubleshooting