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Many contractors use a filter in a grille so you do not have to open unit.Let me grab a manual and see where you will put them if they are in unit.
Thanks for your patience. Had to find manual and make you a drawing. Filters will be in panel as shown below
There should be 4 screws that hold the panel on.Remove the screws and filters will be inside if there are any.That is why most contractors put them in a grille inside the house so you do not have to open the unit
Do you have a filter inside house?
OK if you have no filter in that panel or in house you most likely have a dirty coil which is causing high limit to shut furnace off
No return grille with a filter in house?
OK that is not a problem .If you have filters in house you do not need in unit.
Was the filter dirty?
OK below is a troubleshooting chart.Follow these steps and let me know where
Let me see if I can upload you a manual,this came from a protected site
See if you can open this
If so scroll to page 27.
I enlarged and am attaching in two pages.
Here is a diagram.Also note the error code legend that should assist in troubleshooting
Gas cock on line should be inline with pipe and switch on gas valve in ON position