Stove start Sometimes

Hello All, I have searched everywhere and I still don't have a clue what could be wrong. I have a Danson Pellet stove with a Acutron 2 control board. My problem is the stove will be working fine and I will turn it off, then when I go to restart it sometimes it won't come on. The lights on the control board will flash when I press the start button, but it won't start. Then after a few times it starts. it has done this for different period of times, one time it wouldn't start for a whole day and other times it takes 5 mins to work. Thanks for any help. George