Bryant · Air Conditioning
The Evolution Control cannot detect the indoor unit. This communication error prevents the system from operating.
Click steps to track your progress.
Recheck all ABCD wiring connections on the indoor unit and other system devices.
Ensure wire colors are consistently matched at all terminals.
Try pressing the left-side button to re-initiate detection.
Disconnect all accessories and devices from the ABCD bus, then connect the User Interface directly to the indoor unit with a short wire to isolate the issue.
Reconnect other devices one at a time to pinpoint the faulty component.
Contact an HVAC technician if the problem persists.