Fan, no heat

We have a 15 year old propane Carrier Weathermaster 9200. The furnace fan is running but the burner does not come on. Since I can’t get talk to the service people until Monday I have the weekend to fix it myself. Is there anything easy for me to do or check? What is the most likely cause of this problem? We have propane, so that is not the issue.

Is the pilot light lit?

ETA: never mind, doesn’t have one.

This troubleshooting guide seems to be pretty straightforward: