Norcold 9162 Not Working on AC

First -- the refrigerator is working perfectly on LP and is as cold as you would want it.

When first turned on, it goes to auto mode then immediately to LP. If I press and hold the mode button, the AC light will come on for 2-3 seconds and then continually flash.

The receptacle where the fridge plugs in has juice which means the breakers and fuses are ok.

Is there another fuse on the back of the unit or does this sound like a control board malfunction?

Thanks