Normal Operation Coleman 4225A Under Counter Furnace

[Possum]

I am having issues with my furnace. The fan never turns off (no matter what position the thermostat is in) unless I turn the thermostat to the "OFF" position. When the furnace decides to ignite it throws pleanty of heat but when the heat call is over the pilot light will most likely be out and the fan then blows cold air all night or until I turn the unit off.

Are these units not supposed to operate the same as a propane furnace in one's house?

[bdpreece]

Sounds like a fan/limit control problem. For a good explanation of this see here. http://toad.net/~jsmeenen/blower.html

[Possum]

Brian,

Thanks for the information. Looks like this weekend will be a thinking in "Tinker's" furnace. I do appreciate the assistance one gets here.

Dennis

[Possum]

Brian, I read that site (thanks again) and decided if the furnace was broke I'd replace it. While taking it out I discovered that the coil for the electric igniter for the pilot was severed so I bypassed`it, after vacuuming out years of dust and whatever from the burners and tubes. The only change from when new is I have to manually light the pilot when we set up. Already used to doing that from the TT we had.

When it was all back together I also figured out (from the wiring diagram on the plenum) that someone had screwed the wiring up big time so that was what was causing the fan to come on right off the bat.

Nice thing about tinkering with old stuff that's broke; you can't make it any more broke. So after a few cold weekends in "Tinker" when we first started using her the now working furnace supplies way more than enough heat when we camp up above where we live, up close to the snow line and the fan goes on andd off with the heat calls just like the furnace in a home, which is what Tinker is more and more.