I would remove all the pellets from fire pot and vacuum out the dust and remaining pellets. Do not put anything back in the grill set your grill to smoke and watch to see how your pellets are feeding and make sure that your igniter is working if keep watching and wait till the pellets start to catch fire. It will eventually heat up and kick the fan on. Two things that might have happened your fan went out or your controller has failed due to the internal probe failed or the controller has failed. Now if it starts ok and the fan works it seems like it is running fine you may had a glitch.