Troubleshooting for Outdoor Unit SiEN18-622
392 Troubleshooting
7.29 Malfunction of Transmission between Indoor Units and
Outdoor Units
Remote Control
Display
U4
Applicable
Models
AII indoor unit models
AII outdoor unit models
Method of
Malfunction
Detection
Microcomputer checks if transmission between indoor and outdoor units is normal.
Malfunction
Decision
Conditions
When transmission is not carried out normally for a certain amount of time
Supposed
Causes
Indoor to outdoor, outdoor to outdoor transmission wiring F1, F2 disconnection, short circuit
or wrong wiring
Outdoor unit power supply is OFF
System address doesn’t match
Defect of outdoor unit PCB
Defect of indoor unit PCB
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