Troubleshooting SiENBE04-507A
112 Service Diagnosis
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.
(R1400)
Connector connection check
(note).
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Is it normal?
Correct connections.
Replace PCBs.
YES
NO
Caution
Model Type Connector No.
Wall Mounted Type 20 / 25 / 35 class Terminal strip~Control PCB
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