I was having trouble with my circuit board so I replaced it. Now my Combustion blower will not shut off. Even after I turn the unit off it continues to run even after the stove gets cold. I have to pull the plug to get it to stop. I called Harman and got the correct dipswitch settings prior to installing the new board. So I don't think that's the problem. Does anyone have any idea why this may be happening? Thanks for any help you can give me.