Furnace won't turn on

Thank you to everyone for your suggestions. The end result was a bad circuit board. The reason I could not find the board or rest switch is thanks to the wonderful job Keystone did installing our furnace(NOT!!). Our furnace is under the fridge which is not a terrible spot however, the only way you can actually work on the unit is by disconnecting everything! We do not have an outside access panel. All of the vents, wires and the propane line had to be removed in order to get to the front of the unit. At least now I know when buying my next unit I will be checking for an access panel to work on the furnace! The labor actually cost twice as much as the part.