OK, I'll explain as best I can.

I replaced my tstat w a digital one about 6 months ago. It has worked fine.

Recently, it has been very cold, and the heat has been running a lot. Then we got warmer weather, so I turned the heat down and it seemed like sometimes it would blow hot, heated air out of registers and other times it would blow room temp air out. Then the house kept getting warmer and warmer, so I turned the heat off all together, but the fan seemed to still be running and room temp air kept blowing out. I couldn't get it to stop. I flipped the switch down in the basement and turned it off in middle of the night thinking I would address the prob in the morning. Now I can't get anything to turn on, and the tstat displays AUX HEAT, but nothing is coming out of registers. I don't get it.

Oh yeah, tstat fan is set to AUTO, not ON.

Coleman Evcon AH12X10BA

Is this in a mobile home?

No. Why?

I cannot locate the model number on my list for residential use so I thought it might be for a MH.

Hmmm. I got the model number from the part that is in the basement, I can't read the one on the outside.

The home is modular. But not mobile home.

Modular/mobile all about the same when it comes to the HVAC.

Here is a site that does Coleman mobile home units. There are good people and post your question under Coleman after you register.

Index page (http://www.mobilehomerepair.com/phpbb/index.php)

Thanks.