[justlkn]

According to Lipperts manual it says when you receive that error to:

“FEATURE DISABLE” > Cycle Main Power or system not Zero Calibrated.

To Zero Calibrate follow the sequence below:
ZERO SETTING THE CONTROL
1. Turn “ON/OFF” button “OFF”
2. Push “FRONT” button 10 times,
3. Push “REAR” button 10 times
4. Control will flash and beep, LCD says “ZERO POINT CALIBRATE”
5. To memorize this level condition , press “ENTER”
6. LCD says “ZERO POINT STABILITY SUCCESSFULLY SET”
7. The control will then turn off.
8. Turn “ON/OFF” on to commence operation.

What's odd though is in another Lippert manual it states this is the reason for the error...
“Feature disabled” - This will happen only during Hitch Recognition. This indicates that the landing gears were not fully retracted prior to starting the unhitch process.

I guess you will have to try both to see which one fixes your issue. Hope this helps.

Glenn