Indoor/Outdoor Communication Error (Transmitting)

What does E9 mean?

The outdoor unit is experiencing an error in transmitting communication signals to the indoor unit. This indicates a breakdown in the communication link, preventing the indoor unit from receiving necessary status or data from the outdoor unit, which can lead to improper operation or system shutdown.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect the indoor controller board for any visible defects or damage.