Furnace Blower Randomly Turns on and Will Not Go Off

brandman

Member
I have owned a 2012 Bighorn 3070RL for about a year. About six months ago I came home from an evening out to find the furnace blower running (just the blower, no heat). Neither the furnace nor the AC had been on and up to that time I had not used the furnace (bought unit used). The only way to get to turn off was to pull the 12 volt fuse. The next day I was going to check things out further. I put the fuse back in, expecting the blower to start, but it didn't. Everything seemed fine. I have used the furnace during the winter and everything seemed to be working fine. Then, today, out of the blue, the blower came on again. I again pulled the fuse. Any ideas what is going on?
 

danemayer

Well-known member
Hi Brandman,

If your thermostat is OFF, meaning it's not in HEAT, COOL, or FAN mode, and the furnace blower runs and won't shut off until you pull the fuse, my guess is the control board on the furnace has failed.
 
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