Technician Ricardo returned to an after hours call back to find the low voltage fuse had blown out yet again went ahead and tightened up all the wiring for the low voltage from the air handler to the thermostat to the outside equipment made sure nothing was to come loose and electrical taped all ends to be much safer from shorting out amongst any of the metal cabinet of the equipment tested both the heating and cooling operation added a 5 amp resetable fuse. system operating normal now