If you get a self test fail annunciation please have the following completed by an Avidyne dealer.
1. Verify Autopilot is properly seated in its tray.
2. Verify no Autopilot external devices has failed (i.e. trim/servo motors, turn coordinator, autopilot disconnect, trim/servo motor, etc.)
If the above reasons are determined not to be the cause, an Avidyne dealer will need to complete an RMA to have the DFC90 repaired or replaced.