RV refrigerator only works on LP gas, not electric?

The refrigerator in my pop up camper is designed to work on 110, propane and 12v. The last time I tried to plug it in and turn it on, it didn't work. I tried using propane (I'd never run it this way before) and it was fine, but it still doesn't work on 110. I've also tried to plug it in in different outlets, so that's not the problem. Any ideas?