Any furnace guys on here wanna make a quick buck? think my limit switch is hooped on my furnace fires up runs for 30 seconds shut down for 30 then starts back up for 30 until proper temp is met. I have changed out the probe style before but I think this one is the one where it has the dial and have to set the limits and I not comfortable changing it out. If anyone experienced and has a free evening get back to me.