Transmission Error Between Indoor Units And Outdoor Units - Daikin Aurora Series Service Manual

Troubleshooting by Error Code
2.60 Transmission Error between Indoor Units and Outdoor
Units
U4
Error Code
Applicable All indoor unit models
All outdoor unit models
Models
Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal.
Detection
Error Decision
When transmission is not carried out normally for a certain amount of time
Conditions
Supposed
Causes
259
Short circuit in indoor-outdoor or outdoor-outdoor transmission wiring (F1/F2), or wrong wiring
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
SiUS341802E
Service Diagnosis