Arrived on 14 September for a furnace tuneup change filters checked all limits in furnace pressure switch ohmed the hsi it read 48.7. Removed and cleaned flame sensor checked blower and capacitor checked heat exchange measured flame sensor find sensor read 2dc checked gas pressure 3.5 inches of water column took temperature rise reads 41 with range of 25-55 induce Motor amps were .3 Rla from that motor is .9 inspected flu. Tested for carbon monoxide no parts per million were found.