5 flashes, 3 beeps - Communication Error (Indoor ↔ Outdoor)

What does 53 mean?

This fault indicates a loss of communication between the indoor unit and the outdoor unit. This prevents the system from operating correctly.

• Poor/Loss of Communication between Indoor and Outdoor units

Click steps to track your progress.

1. 1

   Turn off the power to both indoor and outdoor units.

2. 2

   Inspect the communication wiring between the indoor and outdoor units for any damage or loose connections.

3. 3

   Reset both units by turning off their power for 1 minute.

4. 4

   If communication is not restored, a technician should check the wiring and control boards.