I found unit stuck in defrost, which was causing the heat strip to come on in air conditioning mode. I checked sensors and could not get the unit to duplicate the problem. It is working now, if it fails again I would advise using a local trane company. This way they could arrive very quickly and would have trane parts. I also tried trane tech support and could not get through.
Found low voltage wiring to be not right. Tested all wires for continuity, all were good. Checked pressures on ac/heat pump, charges were proper. Also programmed newly installed thermostat and tested operation. All is working properly.
