White Knight Condenser Dryer keeps tripping electricity?

My White Knight Condenser Dryer (model 767C) keeps tripping my electricity. It was doing this a while ago, and found that by taking it out of the space under my counter, and using it freestanding in my kitchen (at the connecting door to my hall), it seemed to work fine. I had to move it though, to sitting in front of my back door, and its been there abouts since Christmas Eve. It was working fine, until 2 days ago, when it tripped the electricity . I tried the reset button, cleaned the condenser, checked the water bottle, etc, as I had done before. But it still trips the electricity. I don't know what else to do...(I'd check the element/thermostat if I knew where they were and what they look like- Help Please).....Any suggestiions would be appreciated.