E7 - Indoor and Outdoor Communication Fault (Split Board)

What does E7 / LED1 flash 15 times mean?

The indoor unit displays 'E7' and the outdoor unit's LED1 flashes 15 times, indicating a communication fault between the indoor and outdoor PCBs on a split board system. This can be due to wiring issues or component failures.

• Communication wiring disconnected
• The indoor PCB is broken
• The outdoor PCB is broken
• The Power Module is broken

Click steps to track your progress.

1. 1

   Turn off the main power switch to the air conditioner.

2. 2

   Check that the linking cable between the indoor and outdoor units is securely connected.

3. 3

   Verify that the core wires of the linking cable are properly insulated and that the Live (L) and Neutral (N) connections are not reversed.

4. 4

   Reconnect the linking cable, or replace it if it appears damaged.

5. 5

   Turn the power back on and restart the AC unit. If the fault reappears, contact a qualified technician.