I have a Honeywell T8001C thermostat. I programmed all the times and tried to use the HOLD function on this thermostat and it continues to blow cold air. Can anyone help me figure out what to do?

Manual

http://customer.honeywell.com/techli...0s/69-1431.pdf

Product data

http://customer.honeywell.com/techli...0s/68-0195.pdf

Besides looking over the instructions for your thermostat you might consider your furnace has a problem. Does the furnace work on (burner on) with any setting?

I have a Goodman gas furnace that was used for the 1st year and a half, since then I have not used it for 4 years. I recently had it turned on, it was working just fine for about 1 week then, it would shut off and on but, it would blow out cold air. Everything is checking out OK, the furnace is working, gas line is open, but it is not igniting.
HELP!

The new thermostat may have a electric gas switch on it that decides how to operate the fan.