Transmission Error Between Outdoor Units - Daikin REYQ-TA Series Service Manual

SiUS371614E

3.58 Transmission Error between Outdoor Units

U7
Error Code
Applicable
All outdoor unit models
Models
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
Causes
Service Diagnosis
Connection error of transmission wirings between outdoor unit and external control adaptor for
outdoor unit
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 PCB
Defective external control adaptor for outdoor unit
Troubleshooting by Error Code
256