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Troubleshooting for RA Indoor Unit SiUS121827E
164 Part 6 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
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