i have an englander 25 pdv . in the past couple days the top auger has been acting up.thought it might be jammed up so i cleaned uout the hopper and around the auger.i started up the unit and it ran just fine.next day the same thing happened so i did everything again.this time no luck.removed the back of the unit while it was still running and could see that motor was tring to move auger .has anyone encountered this and can you set me in the right direction