I have a 25PDVC -SPH10 Manufactured 10/2000. went to start it like always while it it was warming up a couple of minutes heat and blower lights went out as normal and about 30 seconds later came back on and heat went up to 9 by itself, turned it off to reset the board let it cool down for 3 hours went to reset the board somehow was on B had a hard time getting it to D. Lit the stove did the same thing had a hard time getting it down kept going to other heat settings on it's own. Anybody know if the board is shot or is it a motor problem auger or combustion shorted somewhere.