Fred, If I read this correctly this failure happened right after you were in the electrical panel. Could a wire be pulled ? Is there a problem with the SMX Controler ? Does this type compressor use a start capacitor that could have had the wire pulled and it is trying to start without the help of a capacitor for a boost ? Seems strange that the only thing you did was tilt down the breaker panel, clean the filter and install the kick heater to loose the AC Compressor.