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I found the fuse, and it is indeed burned out (I think--the two wires in encased in plastic aren't joined and there appears to be a "burn" mark on the inside of the plastic). The outside of the fuse is labeled with the number 5. Does that mean it is a 5 amp fuse? And, are those fuses available at a home supply store (like Lowe's/Home Depot), or only through a specialty store?
Thanks for the help!
Unfortunately, replacing that fuse didn't fix the problem. When I first switched the unit from Off to Heat the other day, I heard a "click" sound that came up through the air return duct near the thermostat. I only heard it once, and it doesn't do it now when I switch the thermostat to the Heat or Cool position. And, when I switch the fan lever from Auto to On, nothing happens.
Is there another fuse somewhere I'm missing, or is there something else I can try before calling in a local HVAC guy?