Signal Transmission Error (Indoor Unit - Outdoor Unit) - Daikin CTXU25G2V1B Service Manual

Troubleshooting
2.12 Signal Transmission Error
U4
Remote
Controller Display
Outdoor Unit LED A 5 5 5
Display
Method of The data sent from the outdoor unit is checked for problem.
Malfunction
Detection
Malfunction When the data sent from the outdoor unit can not be received without error, or when the disable
status of signal transmission continues for 15 sec..
Decision
Conditions
Supposed
Causes
120
Defective outdoor unit PCB
Defective indoor unit PCB
Signal transmission error between indoor and outdoor unit due to improper wiring
Signal transmission error between indoor and outdoor unit due to breakage of relay wire
(transmission wire)
(Indoor Unit - Outdoor Unit)
SiBE12-908
Service Diagnosis