Troubleshooting by Error Code
5.53 Transmission Error between Indoor Units and Outdoor
Units
Applicable
All indoor unit models
All outdoor unit models
Models
U4
Error Code
Method of Error
Microcomputer checks if transmission between indoor and outdoor units is normal.
Detection
Error Decision
Transmission is not carried out normally for a certain amount of time.
Conditions
Supposed
Short circuit in indoor-outdoor or outdoor-outdoor transmission wiring (F1/F2), or wrong
Causes
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
240
wiring
SiME341909EA
Part 6 Service Diagnosis