If your Trane furnace is not kicking on, there are a few possible explanations. First, check to make sure that the power is turned on at the breaker box. If it is, then check to see if the furnace switch is in the on position. If both of these things are true and your furnace still isn't kicking on, it's possible that the pilot light has gone out. In this case, you'll need to relight it following the instructions in your owner's manual. Finally, if none of these things seem to be the problem, it's possible that there is an issue with the furnace itself and you'll need to call a heating technician for assistance.