norcold fridge question...im new

[Big J]

Any help or input would be appreciated. Took my new camper to my lot yesterday and this is where it will stay. No power yet so i used the propane for the fridge and the 12 volt for the lights and slide. All was good until this morning. Battery dead and fridge was blinking a amber light as it was solid yesterday and last night. Borrowed some 30 amp power this morning and fridge went to ac power. Question is what is the blinking amber light on fridge? it was still doing fine with a dead battery just the light was blinking. Thanks