6-time blink 2.5 seconds OFF — Serial communication failure

What does 6-time blink 2.5 seconds OFF mean?

The outdoor unit LED blinks 6 times with a 2.5-second pause. This indicates that communication has failed between the indoor and outdoor units for 3 minutes.

• Communication wiring issue between indoor and outdoor units
• Serial signal error
• Defective indoor or outdoor control board

Click steps to track your progress.

1. 1

   Turn off the power to the air conditioner at the circuit breaker.

2. 2

   Wait for at least 30 seconds, then restore power.

3. 3

   Check all wiring connections between the indoor and outdoor units for proper seating and damage.

4. 4

   If the error continues, a service technician should investigate potential miswiring or serial signal errors.