Upper lamp blinks 0.5-second ON/OFF - Miswiring or serial signal error

What does 0.5-second ON / 0.5-second OFF blink mean?

The upper operation indicator lamp blinks rapidly with 0.5-second intervals of ON and OFF. This signifies a problem with the serial signal communication between the indoor and outdoor units, or potential miswiring.

• Incorrect wiring between indoor and outdoor units
• Faulty serial signal communication
• Outdoor unit not communicating properly

Click steps to track your progress.

1. 1

   Refer to the section 'How to check miswiring and serial signal error'.

2. 2

   Verify all wiring connections between the indoor and outdoor units.

3. 3

   Ensure the outdoor unit is functioning and able to send signals.