Indoor/Outdoor Wiring Polarity Error (S1, S2, S3)

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The wiring between the indoor and outdoor unit, specifically for the communication lines S1, S2, S3, has incorrect polarity. This prevents the remote controller from operating and causes 'PLEASE WAIT' to be displayed. The outdoor board LED will blink green twice and red once alternately after system startup.

• Incorrect polarity wiring between indoor and outdoor units on S1, S2, S3 lines.
• Reversed connections for communication or power lines.
• Wiring error during installation.
• Loose terminal connections leading to intermittent polarity detection.

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1. 1

   Verify the polarity of the S1, S2, S3 communication wiring between the indoor and outdoor units according to the system wiring diagram.

2. 2

   Correct any reversed polarity connections at the indoor and outdoor unit terminal blocks for S1, S2, S3.