Error E3 / Indoor Red LED Flashes Twice — Incorrect outdoor unit address setting

What does E3 / Indoor Red LED 2 flashes mean?

Error E3, indicated by the indoor unit's red LED flashing twice, means the outdoor unit's address setting is incorrect. Proper addressing is essential for system communication.

• Incorrect address setting of the outdoor unit

Click steps to track your progress.

1. 1

   Refer to the installation manual to correctly set the outdoor unit's address.

2. 2

   Ensure the outdoor unit address is unique and matches the system configuration.

3. 3

   Power cycle the air conditioner system after adjusting the address settings.

4. 4

   If you are unsure how to adjust the address, contact a professional installer.