Went out for no heat call and find roll out switch open for Lennox 90+ funace model# M/NG26Q3/4-100-5.Reset switch and look for anything what would cause this. Check out vent piping,gas pressure, induce motor,flame, filter everything ok .Get a callback it is out again .Only unusual thing observed was that right side of the burner box was much hotter then the left.First burner where is the igniter and roll out switch located is not alligned exactly with the flame chamber by manufacters.So I do not know if it is normal to get hotter on left side ori just the roll out switch is weak.Any reply is welome. thank you