I complete heating pm check. The blower motor assembly is very dirty due to poor filter system. The control board is sending non-optimal signals and the blower motor is operating with high amps. The Evaporator coil is rusted and the supply plenum is made of fiberglass. The flame sensor is worn and showing non-optimal readings. The gas valve operational, but showing irregularities during operation. I recommend a UV light to improve indoor air quality for 550$. The system is need of a CO calibration. The system is operational at this time.