Intertherm heat coils won't stay off until...

Question

Hi, we have an Intertherm electric heat/ac unit E2EB-015HA in our 99 Fleetwood double-wide.We awoke to an electrical shortage smell,the coils were red hot and cycling on and off with the fan off and temp reached,still heating,only shut off seconds when thermocouple?( safety pops ),then comes back on heating every 20-30 seconds! Whats parts are stuck or burnt out! Help,disabled ,moms terminal and we must repair myself!