What would make a furnace blower stay on continuously?

broken vaginalsitila Usually a stuck switch in the motor itself. I would take the motor out (usually really easy job- Make sure that power to motor is off!!) Take it to your local motor shop and usually it will cost anywhere from 25 to 75 bucks to repair, as opposed to the 150 to 300 bucks for a repairman to do it. I used to own a laundromat and did this on a weekly basis. If the weather is to cold to have it out of service for long ask the motor shop if they could possibly fix it at once. For a few bucks more they'll probably do it.