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Well, I may be in the same boat - it turned out that my replacement 215 degree fahrenheit aux limit switch needed a manual reset after the initial euphoria. I'd done a thorough cleanout of the...

4 windows and one half glass door facing mostly E, with some SE exposure. Zip 94556.
Other walls surrounded by interior space. Interior space tends to be some 20 degrees F cooler than outside...

So, my wife wants to add a/c to a 400 s.f. room in our home, so I'm thinking something I can do with a split - condenser hung under rafters of our one story ranch home, and the fan/thermostat unit in...

I have two controls on my forced air unit, one of which is a programmable multifunction model. On that controller, there is a 'fan' switch which I use for circulating the living room air heated by...

Jim?
Jim Barnhart - Heating, Air Conditioning, Fridge, HVAC - Home Appliances - Home/Garden - AllExperts.com

So, I replaced my 215degree F limit switch and things seem fine.

Learned a lot, and...

OK, I'll go with that.

I'm still not sure what to do about the auxuiliary limit switches in my unit. One is self resetting (the one that is somewhere behind the blower), and the other I've been...

I've heard of the dragon program. Does it work in reverse, too?

I see that it does not do grammatical testing (I think ms word does this annoyingly at times) - in distinguishing between there and...

So, the limit switch is for gas? There must be more than one type of limit switch, then.

On my furnace, it says that if the limit switch pops a lot, to call in a repair person.
Sounds like you...

Hey, labman. That was a good link - I checked it last night and it helped me a lot, especially the photos. I did see the limit switch right above the burners, took it out, looked at it and put it...

OK, so yesterday, not finding a manual (wife's new filing system), I looked up day and night and came up with:
http://www.furnaceclaims.com/detailed_notice.pdf
Class action lawsuit (time to secure...

OK, I mucked with things and found a temp switch that was not closed - it measured 25VAC on it when it was not closed. I took it off, measured it and saw that it had a center reset switch which I...

OK, so I measured some 50 ohms on the igniter - seems high, but then, that's 2+ amps and I did see it glow orange during the test operation.

I'm confused on what happens when. I looked at various...

OK, so I took mine apart. The igniter is a two terminal device with a short cable and connector. Turn off power to system, disconnect igniter. Measure its resistance. If it's open, it's bad.
...

Yeah, but how does he troubleshoot it?
Ferenc

So this morning I cleaned the filters and turned power off to the furnace. Now power is back on, self test passes (inducer, igniter, humidifier relay (no humidifier hooked up), blower high, blower...