I have an older P38 with 2 knob control style board. The stove runs perfectly well other than the stove not turning off (combustion fan). If I unplug the stove, and plug it back in when ready to light it again, the stove is problem free as far as operating it. The controls will increase and decrease the feed rate, and it responds to input as it should. The ESP probe is not the problem, as I bought and installed a new one, and it changed nothing. So I put the old one back in and repackaged the new one for now. My initial thought was the board was taking false readings from the ESP, say 150 degrees, so that is why the stove was coming on when plugged in, and not shutting off. But the new ESP has disqualified that possibility. Any ideas? Bad control board? Bob