Upper OPERATION INDICATOR lamp blinks ON and OFF at 0.5-second intervals — Miswiring or serial signal trouble

What does Upper lamp Blink 0.5s mean?

The upper lamp on the indoor unit blinks on and off rapidly at 0.5-second intervals. This indicates a potential miswiring issue or trouble with the serial signal communication between the indoor and outdoor units.

• Miswiring of indoor/outdoor connecting wire
• Serial signal communication problem between units

Click steps to track your progress.

1. 1

   Check the indoor/outdoor connecting wire for secure connections and any visible damage.

2. 2

   Verify that main power is supplied correctly to the indoor unit.

3. 3

   If problems persist, contact a service technician to check for miswiring and serial signal errors.