Sorry, I didn't have any time to write today until I just finished work--I had cases all day long...we were busier than a one-armed paper hanger!!! You probably thought I'd blown up the block when you didn't hear from me!
So I went home last noc and futzed with the furnace until well after 2AM but didn't accomplish anything. I found the high limit control switch (you were right, it was very obvious)! Now, the left wire had a rubber cover over the end and it came off very easily. However, the right side had no rubber cover on it and I met a great deal of resistance when I tried to pull it off so I was reluctant to try and force it. I even tried some gentle, steady pressure with some pliers and also tried rocking it back and forth just a little but it didn't want to give at all and in fact, it was pulling on the insulator board. I don't think that connection will come off unless you bend the crimps out a little and I didn't want to do that. I figured if it was that hard to remove, it wasn't supposed to come off (at least not for some hack like me)! So I decided to just leave that alone.
I did find the owner's manual (it was in the pocket behind the service/maintenance sheet--I thought it would be thicker so didn't even think about looking for it there). One thing I didn't try was starting the furnace up "from scratch" by turning off the gas valve on the smart valve and clearing the line and then firing it up. Chances are that wouldn't help anyway, would it?
Also, I noticed that the "peep hole" has a thick, rusty-brown covering on the inside--I'm not sure you'd even be able to see if the pilot light did come on! Is that normal?
The other thing I noted is that I don't have a "condensate trap" on my unit like it shows on the schematic in the manual. I know that I have a humidifier on my unit, however. It's an ancient "Chippewa 224". I do have three drain hoses that come from the furnace and converge together at the drain in the floor, though. I'm assuming that's what these are for? I did read one thread where a guy talked about first and foremost, making sure that nothing is clogging the system and went on to talk about taking one drain hose off and realizing that sludge had caused a buildup and once he cleared that out (by blowing on it!) he immediately had heat again! I'm guessing my problem isn't that simple.
So I'm beginning to think that I just may have to bite the bullet and call the repair guy. Would that be your take on the situation as well? I really don't want to mess around and make things any worse; I just thought that maybe there was some simple solution that I could try before calling in the "big guns"!
I'll wait for your suggestions. Thanks so much!