Indoor/Outdoor Unit Communication Error (Outdoor Transmitting)

What does E9 (6811) mean?

The outdoor controller circuit board detects '0' receiving 10 times continuously despite transmitting '1', or it fails to find a blank transmission path for 10 minutes. This indicates potential contact failure or looseness in the indoor/outdoor unit connecting wire, a defective communication circuit on the outdoor controller circuit board, or noise interference in the power supply or connecting wire.

• Outdoor unit fails to transmit communication signals to indoor unit.
• Damaged or disconnected communication wiring between units.
• Faulty outdoor unit control board.
• Interference on the communication line.

Click steps to track your progress.

1. 1

   Check for disconnection or looseness of the indoor/outdoor unit connecting wire.

2. 2

   Turn the power off, then on again. If the abnormality reappears, replace the outdoor controller circuit board.