Indoor Unit Communication Receive Error

What does E7 mean?

The indoor unit has detected an error in receiving communication signals from the outdoor unit. This indicates a problem with the data transmission path from the outdoor unit or the indoor unit's receiving circuit, leading to a loss of control and coordination.

• Indoor unit fails to receive valid data packets from the outdoor unit.
• Communication cable issue (open, short, noise) between indoor and outdoor units.
• Faulty communication receiver chip on the indoor unit PCB.
• Outdoor unit not transmitting data correctly or at all.

Click steps to track your progress.

1. 1

   Verify the indoor/outdoor connecting wire terminations match the wiring diagram for correct connection.

2. 2

   Inspect the indoor/outdoor connecting wire and power supply for signs of electrical noise interference that could disrupt signal reception.

3. 3

   Cycle power to the unit (turn off, then on again) to re-check for the error.