Specifications

Si01-406 Troubleshooting
Service Diagnosis 87
4.2 Indoor Unit PCB Abnormality (A1)
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).
YES
Is it normal?
NO
Correct connections.
Replace PCBs.
(R1400)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Model Type Connector No.
All indoor units Terminal strip~Control PCB