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.

• Outdoor unit is not transmitting communication signals to the indoor unit.
• Damaged or disconnected communication wiring.
• Faulty outdoor unit control board.
• Interference on the communication line.

Click steps to track your progress.

1. 1

   Check the wiring between the indoor and outdoor units for correct connections and continuity.

2. 2

   Inspect the outdoor controller circuit board for any visible defects or damage.

3. 3

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