Had to replace the programmable thermostat. Instructions weren't clear to me as far as what jumper settings of on or off looked like.

• Does "on" indicate placing the plastic piece over the jumper posts?

I have 5 wires, White, Yellow, Red (which was connected to RH, then had a piece of wire connecting RC to RH), Green and Blue. The blue one wasn't connected to the old thermostat.
I have Gas forced Air with heat and a separate AC unit that runs through the same vent system.
Thanks for any help.

What thermostat?
You did not tell us anything about the thermostat. Model/Name brand or should I get out my crystal ball and look around? LOL

Generally speaking, white is used as a common wire, green for fan, red for hot wire (hence the jumper between heat Rh and cool Rc), yellow for the condenser. On a combination unit like yours, I spliced the R to the condenser, bypassing the heat control board. This is done at the heater and not the t-stat. You will probably need to trace all the wires to get it wired in correctly. Maybe the manufacturer has an on-line tech support

I did not use the blue wire.

Incorrect wiring can damage the components. If you aren't sure, a tech might be the best way to go, unless hvac can walk you through it.

Good luck

Sorry, new to the site. I went from an Indiglo 3599 to Ritetemp 6036.

Connect all wires exactly as before. You do not need to connect the blue.

Yep, that's what I did. Turns out there was a blown fuse on the furnace, coincidentally. Once that was replaced, all was well.
Thanks.

Probably blew the fuse when wiring the stat. Glad you got it working.