Upon arrival inspected furnace and found unit operational. Found no errors currently system is operating. Filter was dirty. Replaced filter. Cleaned burners and flush drain trap. Gas heating preventative maintenance performed Check filter - 20x25x4 new today Clean flame sensor Ohm test igniter: 57.9 ohms Inspect wiring for loose connections and/or hot spots - none found Inspect exhaust flu - no concerns Set thermostat for heat Check amp draw on blower motor: 4.21 Check amp draw on inducer motor: 0.89 Check delta T - 56° Furnace is in optimal running conditions