Upon arrival unit was on but not running. Checked the thermostat and it was turned up and calling for heat. Went downstairs and saw the furnace was not running and the furnace doors were ajar. Removed the top and bottom panels and put the bottom panel on again. Once we adjusted the door the furnace turned on with no issues. The furnace blower door was not fully pressing in on the door switch and was not letting the furnace turn on. Watched the system cycle on and off 5 times. Unit is working properly. Took pictures and measurements for a media filter box. Current filter is 16x25x1