Performed heating maintenance on a 2001 Trane 78% efficient single stage natural gas furnace 16x25x1 filter is OK, **will need changed in another month or so** Pulled and clesned flame sensor Blower wheel is not the cleanest, but considering age, do not feel it is worth pursuing cleaning it Cleared pressure switch port Run tested furnace Gas pressure is 3.5"wc Combustion test numbers are in a healthy range 0ppm carbon monoxide in the ductwork Temperature rise 56⁰ Despite age, furnace is running OK and safe at this time.
