Remote Controller Transmit Error (Indoor Unit Side)

What does EF mean?

The indoor unit has detected an error in transmitting signals to the remote controller. This suggests a problem with the indoor unit's communication circuit or the wiring between the indoor unit and the remote controller, preventing it from sending status updates or acknowledgments.

1. 1

   Verify the connecting wire between the indoor unit and remote controller is connected correctly at both ends.

2. 2

   Inspect the transmission wire of the remote controller for signs of electrical noise interference.

3. 3

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