Transmission Error Between Outdoor Units - Daikin VRV EMERION REYQ-AATJA Service Manual

Troubleshooting by Error Code

3.70 Transmission Error between Outdoor Units

Applicable
All outdoor unit models
Models
U7
Error Code
Method of Error
Microcomputer checks if transmission between outdoor units is normal.
Detection
Error Decision
When transmission is not carried out normally for a certain amount of time
Conditions
Supposed
 Connection error of transmission wirings between outdoor unit and external control adaptor for
Causes
 Connection error of transmission wirings between outdoor units
 Cool/Heat selection setting error
 Cool/Heat unified address setting error (functional unit, external control adaptor for outdoor unit)
 Defective outdoor unit main PCB
 Defective external control adaptor for outdoor unit
423
outdoor unit
SiUS372201EB
Part 6 Service Diagnosis