Service manual

SiE18-201 Troubleshooting - Split Type Indoor Unit
Service Diagnosis 193
1.5.10 Signal Transmission Error (Between Indoor Unit and Remote
Controller)
Remote
Controller
Display
U5
Indoor Unit LED
Display
A 5 B 3
Note: No LED Display on FTK(X)25/35 J Series.
Method of
Malfunction
Detection
The data received from the indoor unit in indoor unit-remote controller signal transmission is
checked whether it is normal.
Malfunction
Decision
Conditions
When the data sent from the outdoor unit cannot be received normally, or when the content of
the data is abnormal.
Supposed
Causes
 Faulty outdoor unit PCB.
 Faulty indoor unit PCB.
 Faulty remote controller cable.
 Faulty remote controller.