Hi I am sorry to hear that. Can you hear the compressor run when the unit is switched on? Also have you ever hooked it up and had it run normally? It is normal for the back to get hot.
here is a site for you to check your wiring as well:http://www2.dometic.com/1c67c7b3-533b-468d-b1fa-8f7ae3b2de3b.fodoc
Thank you Tech Michael