Outdoor Board LED green (twice) and red (once) blink alternately after startup - Incorrect wiring between indoor and outdoor unit (Polarity is wrong for S1, S2, S3)

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After the initial 'startup' sequence, if the outdoor unit's LED1 (green) blinks twice and LED2 (red) blinks once alternately, it indicates incorrect wiring between the indoor and outdoor units, specifically wrong polarity for S1, S2, S3.

• Incorrect wiring between the indoor and outdoor unit (Polarity is wrong for S1, S2, S3).

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1. 1

   Turn off the main power supply to the unit.

2. 2

   Verify the wiring between the indoor and outdoor units, paying close attention to the polarity of S1, S2, and S3.

3. 3

   Correct any miswiring and then restore power.