Furnace will only run one cycle then stops

Hi All,
Our furnace is a Bryant 90 High Efficiency (power vent) and it is about 18 years old. When the furnace is switched off then on (from either the power switch or thermastat) it will run one complete cycle without any problems (the burn piece of the cycle is about 5 minutes) then everything shuts off and doesn't re-start. If I run a self test on the furnace, it cycles through each of the components successfully. The problem is that it simply will not re-start on its own (even though the temparature is 20+ degrees below the temparature on the thermastat).
I had the furnace specialist out (and paid the $145 for 45 minutes of looking) and was told we need a new furnace. I'm not ready to give up yet. All of the pieces cycle correctly, but only once. Unfortunately, only my wife was home when the furnace person was there. According to the bill he cleaned some leaves from the intake and made some adjustments. The carbon monoxide reading he took was 20 ppm and he said it went down to 16 ppm by the time he left.
Due to the elevated carbon monoxide reading, I assumed that clogging of the intake pipe may have really been an issue, but even after whatever the HVAC guy did, the furnace behaves exactly the same.
I know my furnace is on the old end, but I would like to squeeze another winter or two out of it if I can.
Any Ideas?
Thanks, --Greg
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At 18 years, it really is time to consider replacing the furnace.
BTW, 20ppm CO air free is a very minimal reading. Maximum allowable is 400ppm air free. We like to see any new equipment at a max of about 50ppm air free.
On 21 Feb 2007 11:35:28 -0800, snipped-for-privacy@gmail.com wrote:

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Ummm where I live furnace replacement usually occurs around the 25-30 yr mark. AC's wear out faster than furnaces.....
you do know why he was recommended a new furnace......the sales technician makes a comfy commission on a sale of new equipment and not so rosy of a commission on fixing something. so hell yeah sell them a new furnace!

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In upstate NY an 18 year old 90+ unit is an old timer. Most don't make that long. Off course, your idea of a cold day is what, 45F? :)
On Thu, 22 Feb 2007 01:32:46 GMT, snipped-for-privacy@gonefishin.net wrote:

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wrote:

Hell we have furnaces that only last 8-12 years here... lol (installed by any "joe-blow")
But seriously, they should be lasting at least 18-20
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I've seen units here fail in as little as 3 years. Not enough return and no filter. Bottom side of the secondary Hx looks like a blanket.
Had another unit that only had 4 of the 5 orifices (orifici?) converted to LP. Secondary Hx was plugged in under a year.
Tempstar, Heil, etc. 10 years seems to be about the limit. And that's on units that aren't bumping high limit.
A properly installed unit might go 20 years. At 18 or even 12-15 years, it's hard for me to recommend making a significant investment in repairs. And the closer to 20 years the unit is the more I would recommend replacing rather than repairing unless the repair is minor.

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wrote:

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On 21 Feb 2007 11:35:28 -0800, snipped-for-privacy@gmail.com wrote:

I cant see it from here so take this for what its worth. What exactly did you pay for?? He cleaned leaves out and made adjustments but it still does the exact same thing??? You may owe him a service/diagnostic charge but thats it unless his service fee is $145? You may just need a competent tech although 18 yrs is old for that unit. Too many things for it to be to just guess.

20 ppm at the FLUE is perfectly fine. 20 ppm in your airstream into the home is unacceptable. Ive seen new water heaters that put out 40 ppm. Bubba

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You need a new furnace, you stubborn cheapskate bastard!
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5 min of running isin't a cycle, the furnace is locking out before one cycle can even be completed. Could be something simple, or something serious. Call someone else to diagnose/service the furnace.
-Canadian Heat
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DANgER (danger< snipped-for-privacy@heat.com) wrote

Wow! Do you offer courses for your diagnostic skills?? Maybe we should be writing this stuff down,,,,, ROTFLMAO!!!! Maybe he should jumper R and G..ya, that'll fix it! Why not jumper the door safety while he's at it, eh Danger?? There's a reason you were given that nickname!
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Respectfully, Bob

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WOW I really got bobby rattled! HAHA Sorry you didn't like my diagnosis. Given his description of symptoms, and detailed readings, I'm sure you could enlighten us with the solution. Wonder bobby!
Maybe he can check the tension on that fan belt... :P Explain to everyone how a fan works bobby. HAHAHAHA
-Canadian Heat
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DANgER (danger< snipped-for-privacy@heat.com) wrote

Oh ya, big time... last night when I went to bed, I tossed and turned for nearly 2 minutes....
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AHAHAHA bobby!
It's fun fucking your mouth :)
-Canadian Heat
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On 22 Feb 2007 04:41:07 GMT, DANgER (danger< snipped-for-privacy@heat.com) wrote:

"something simple, or something serious." Damn DANgER. You are a real whiz bang on this furnace stuff arent you? How did you ever think of that one? You are a genius. Bubba
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wrote:

What happens if it's "simply serious"? lol
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Sorry bubbs, was there a suggestion in there? Or is this just your typical, "I'm obssessed with DANgER post"
HAHAHAHA
-Canadian Heat
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On 22 Feb 2007 17:09:14 GMT, DANgER (danger< snipped-for-privacy@heat.com) wrote:

Seems you're being beaten down like the dog you are. You running out of material, or what? Bubba
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