Troubleshooting SiUS04-904
Service Diagnosis 99
4.2 Indoor Unit PCB Abnormality
Remote
Controller
Display
A1
Method of
Malfunction
Detection
Evaluation of zero-cross detection of power supply by indoor unit.
Malfunction
Decision
Conditions
When there is no zero-cross detection in approximately 10 continuous seconds.
Supposed
Causes
Faulty indoor unit PCB
Faulty connector connection
Troubleshooting
Note: Connector Nos. vary depending on models.
Connector connection check
(note).
Is it normal?
YES
NO
(R7130)
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
Model Type Connector No.
Wall Mounted Type Terminal strip~Control PCB
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