Error E31 / Outdoor Red LED Flashes Once — Indoor or outdoor unit addressing error

What does E31 / Outdoor Red LED 1 flash mean?

Error E31, indicated by one flash of the outdoor unit's red LED, points to an addressing problem. This can be a duplicated indoor unit address (U00-U47) or an incorrect setting for the outdoor unit's address.

• Duplication of an indoor unit address number (U00 – U47)
• Outdoor unit address setting error

Click steps to track your progress.

1. 1

   Turn off the air conditioner's main power.

2. 2

   Review and verify the address settings for all indoor units, ensuring each has a unique address within the U00-U47 range.

3. 3

   Check the outdoor unit's address setting to confirm it is correct according to the system's design.

4. 4

   Refer to the installation manual for proper addressing procedures.

5. 5

   Restart the system after adjusting any address settings.