[hankpage]

The top of the fridge is the warmest area. (heat rises) The sensor should be as high as you can get it keeping it inside the plastic sleeve so it senses the warmth from the fin and calls for more cool. (at least this is what I have found in my last four RVs.) It operates more efficiently on gas. (so I always precool on gas) Load it with cold items so they help to cool it.
You may be surprised at the cost of replacing that fridge... since it is under warranty, give it a chance and if it is a bad unit let Dometic replace it .... You already paid big bucks for the one you have. JM2¢, Hank