Hello, I have an older Whitfield Pellet Stove. The problem I'm having with it is it will not generate maximum heat on the high setting. It is only warm not hot. The flame does burn and it is Somewhat lazy but not real lazy. The auger does feed the pellets at a good rate ,about 3 second cycle and the Stove will put out heat if I manually feed allot of pellets into the pot. The window in the front of the stove turns VERY BLACK. I hope that one of you can help me out. Thank-you Lance