SiUS12-928_B Troubleshooting for Indoor Unit
Service Diagnosis 146
5. Troubleshooting for Indoor Unit
5.1 Indoor Unit PCB Abnormality
Remote
Controller
Display
A1
Method of
Malfunction
Detection
The system checks if the circuit works properly within the microcomputer of the indoor unit.
Malfunction
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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