Matt that is not normal. I have seen some condensation with extreme temperature changes or if the vent is blocked. It can also occur if you do not let it cool before putting the cover on or from an external source like a bad storm.I would take the back plate off and make sure the insulation is dried out before running it so you don't short the controller out.If you give us a call at Cookshack we can look at the possible cause.(800)423-0698 ask for Bill or Tony.