MXS Service Manual

Troubleshooting for RA Indoor Unit SiUS121736EA
151 Service Diagnosis
5. Troubleshooting for RA Indoor Unit
5.1 Indoor Unit PCB Abnormality
Error Code A1
Method of Error
Detection
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Error Decision
Conditions
The system cannot set the internal settings.
Supposed
Causes
 Wrong models interconnected
 Defective indoor unit PCB
 Disconnection of connector
 Reduction of power supply voltage