SiUS28-902_B
Troubleshooting by Indication on the Remote Controller
Service Diagnosis
139
3.40 Transmission Error (between Indoor Units and Outdoor
Units)
Remote
Controller
Display
U4
Applicable
Models
FCQ, FHQ, FAQ, FTQ
RZR, RZQ
Method of Error
Detection
Micro-computer checks if transmission between indoor and outdoor units is normal.
Error Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
Wiring indoor-outdoor transmission wire is incorrect.
Defective power supply
Burning out fuse
Defective outdoor unit PCB
Defective indoor unit PCB
Defective outdoor unit fan motor
External factor (Noise, etc.)