Performed heat pump diagnostic new castle. Found Trane heat pump air handler with bad disconnect, melted aluminum wires at connection points inside disconnect. Replaced disconnect and cut out bad sections of burnt wires. Tested unit. It cycled on, tested in multiple modes emergency heat, and regular. System running at this time. Checked inside temps on breaker... 63 degrees seems to be doing ok at this time. If problem consists, the new disconnect is covered under a 1 yr warranty.