There must be something unusual that is causing these failures. I just performed a secondary heat exchanger replacement on a 398 last week, and it still had the vintage-1989 inducer wheel intact. The customer is the original purchaser of the unit, and my company installed it, so there are no mysteries or questions regarding the age of the parts. Do you, by chance, live in a coastal area? I'm not sure what impact salt air might have on the unit, but I would expect the effects would be more evident toward the metallic parts.

I live in the Chicago area. I had the house custom built and specified Bryant because of previous experience with them and my father-in-law was in heating and plumbing and considered them a good product. Unfortunately, I have had several problems with this unit and writing the factory appears to have no effect. Could just be a lemon.

Not much explanation from here. Except to say you have just had a run of bad luck. Can't really get to the source of the problem from here. You do have the furnace going again don't you?? If so, just hope it works for some time. And maybe think about getting into a newer model, with a long standing warranty.

Just a note to thank everyone that responded to my question/problem. As expected, I never did get a response from Bryant. As a bit of information, I was able to find a source for the blower only through the internet. I found it at Shortys HVAC for $37 including shipping which I think is a deal and they were really fast in shipping it.

That is a deal indeed! Still... something unusual. I did another 398 secondary h/x replacement today, this one from 1986! Still the original inducer wheel... have you ever had the gas input checked?

Next time I have the furnace serviced, I will have the pressure checked.

My bryant furnace comes on,and blow cold air for a very long time with out the main burner coming on.I would turn the thermostat to off,and return a hour later to turn it on.The furnace would come on and work fine,this problem have been going on for about a year and getting progressively worst.What could be the problem?

My bryant furnace comes on and blows cold air for a very long time with out the main burner coming on.I would turn the thermostat to off,and return a hour later to turn it on.The furnace would comeonand work fine,this problemhave been going on for about a year and getting progressively worst.What could be the problem?

Try cleaning the flame sensor.

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Originally Posted by hvac1000

Try cleaning the flame sensor.

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That was done.Thanks.

Exact model number?

My furnce is making a high pitch sound when blower comes on and then once in a while a grounding noise, sometimes the noise will be often. I have turned it down and it doesn't do it as much, could it be the blower or squirrel cage?

My furnace is making a high pitch noise and sometimes a grinding noise. Could it be the squirrel cage or blower itself?

kenchadak, please start your own post, you will get more responses this way.

I have a Carrier 58sta/stx and funny enough the nolise that came from my furnace sounds like... when we were kids and we used to put baseball playing cards in our spokes.. I discovered that fan wheel was imbalanced... I centered it... a few days later... I heard the noise again... then it went silent... the furnace itself is running correctly albeit the inducer motor is quite warm to touch... I also disccovered that part of the plastic wheel... the inner part that grips the shaft was broken... luckily enough I found a place that sells them for $18.00... and it is an easy fix... mind you... when I called the HVAC guys they said they would replaced the motor for a mere $800.00... I was glad to find forumns such as this or I could have been out some bigger bucks :)