Weather King 8PJ10NDR01 When I

Question

Weather King 8PJ10NDR01 When I turn the heater switch to ON position the furnace runs what sounds like an internal fan. Second, the igniter glows and when it reaches it's hottest stage the fan thrusts air through the air ducts / vents and the burners light for about 30 seconds to a minute blowing cool air. After a period of about 30 seconds to a minute the burner turns off. After the igniter and burners repeat this about 2 times the heater shuts down by it's self, even when the temp gauge has not reached the temperature setting.