In checking the unit over very closely I found I had replaced the device I thought was a thermal limit t-stat when in fact it was a thermister. I found another one in my spare parts box and installed. The unit ran but produced no heat. After cycling the unit quite a few times it stopped working-that is it would not turn on the drum rotation except for an instant. I had checked the heating element an did not find a problem with it. I could not find a limiting t-stat. Any suggestions ?