When the blower runs, it does a great job of moving warm air but it seems to just turn on whenever it feels like. Unfortunately there is no on off and it is controlled only by the snap switch in the back. Based on what ive read, it needs to hit 120 degrees to turn on, but my stovetop has been 450-500 for 2.5 hours now. The cast iron on the sides of the stove are about 350 and I cant get a good reading on the back because of the plate. I just cant imagine the switch hasnt hit 120. Some days it will turn on after 30 minutes and some days are like today. How do I access this switch and is it something that commonly goes bad? I dont think it ever worked great.....