Did a maintenance on a Lenox gas furnace. During the maintenance I clean the flame sensor. Also I cleaned out the burner box and the blower motor housing. Also shop vac the entire unit because it’s in the laundry room and had a lot of dryer lint on it. Also did an amp check on the inducer motor and the blower motor which both meet the furnace specs. Also did a combustion analyzer test the co level was seven and the O2 level was 17. Also changed out to 16 x 25 by one filter. System is running properly at this point. M#G60UH-36B-09010 s#5911A06065.