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I found one dime sized thing with two wires and a button, but when I pushed it the LED still flashed 4 times and I still had no heat. Are there more than one around the burner? I can only find one.

I am a new home owner and have never dealt with a newer furnace. I woke up and the furnace was blowing out cold air. The LED inside of the furnace flashes four times which says 'Limit or Rollout...