No heat sugar hill. Completed diagnostic on 7 year old furnace. Ignitor and flame sensor are bad and need to be replaced. Replaced both. Stair pressure is hard to read because of return air. There is no return box and one filter not sealed inside furnace with two return ducts going into furnace. Return box needs to be installed with sealed filter rack to be able to read static pressure properly. Gas line is not ran to utilize sediment trap. System has no water safety installed.