Troubleshooting by Error Code
3.68 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
343
outdoor unit
SiUS341802EC
Part 6 Service Diagnosis