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I can help you with this problem. If the door gasket is very loose then yes it can prevent the stove from creating enough vacuum to pull in the vacuum switch, however usually the problem is due to a dirty stove or stove pipe. The auger motor, and snap switches have nothing to do with the problem. Have you had the stove and pipe cleaned professionally (removing baffles, disconnecting exhaust blower and cleaning pellet vent pipe? This should be done first.