Started the stove this morning about 8 and it ran till approx. 2pm when it shut down for what seems to be no reason. There was no codes to be displayed, the burn pot was full of un burnt pellets, the hopper had enough pellets in it, the augers didn't jamb up and I had given it a good clean last night with the ash vac. It ran on #4 and #8 on heat and fan setting. Any ideas?