I have a Luxaire furnace model PCLU-LD14N100A, the furnace comes on and runs for 10 minutes or so but when the heat shuts off the blower keeps running, the only way to shut it off is to turn off the power switch on the side of the furnace, it doesn't do it every time, only about 25 percent of the time. Thanks for any help Jerry

Sounds like you have a fan control problem. Sometimes they will stick and cause a problem. The best thing you can do is replace it but some of them are adjustable. Look at the sticky notes at the beginning of this board for info on that control.