Operation indicator blinks 3 times — Serial signal error

What does 3-time blink mean?

The operation indicator blinks three times, signaling that the indoor unit is not receiving the serial signal from the outdoor unit. This can occur if the signal is lost for an extended period.

• No serial signal received from the outdoor unit for up to 6 minutes
• Potential miswiring between indoor and outdoor units

Click steps to track your progress.

1. 1

   Check for miswiring between the indoor and outdoor units.

2. 2

   Refer to the outdoor unit's service manual for compressor protector checks.

3. 3

   Ensure all signal connections are secure.