Upper OPERATION INDICATOR lamp blinks 3 times (in recall mode) — Serial signal communication error

What does Upper lamp 3-time blink (recall) mean?

In failure mode recall function, if the upper OPERATION INDICATOR lamp blinks three times with a 2.5-second OFF interval, it indicates that the serial signal from the outdoor unit has not been received for a maximum of 6 minutes.

• Loss of serial communication signal from the outdoor unit
• Miswiring of indoor/outdoor connecting wire

Click steps to track your progress.

1. 1

   Release the failure mode recall function by cycling power to the unit or pressing the remote controller's RESET button.

2. 2

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

3. 3

   If the issue persists, contact a service technician to check for miswiring and serial signal errors.