I have a Whitefield Advantage II pellet stove insert for about 11 years and had no problems until yesterday. Went to start the unit and both blowers start and stop a short time later. I have cleaned the stove completely and still the blowers will start and then slowly stop. The auger works and a fire will start but i have to unplug because of both blowers will not stay on. I know it's old but both blowers fail at the same time?? Any suggestions?