Operation Indicator Lamp Blinking (0.5s intervals) - Miswiring or Serial Signal Trouble

What does Upper lamp Blink 0.5s mean?

The upper lamp of the indoor unit's Operation Indicator blinks on and off every 0.5 seconds. This signifies a problem with the wiring between the indoor and outdoor units or an issue with the serial communication signal.

• Miswiring between the indoor and outdoor units.
• Trouble with the serial communication signal between units.

Click steps to track your progress.

1. 1

   Turn OFF the main power supply to the air conditioner.

2. 2

   Carefully check the indoor/outdoor connecting wires for any miswiring or loose connections. Ensure all wire connections are secure at both the indoor and outdoor terminal blocks.

3. 3

   Turn the main power supply back ON and observe if the blinking stops.

4. 4

   If the issue persists, contact a qualified technician for further diagnosis of the serial signal and wiring.