Bryant 90 Model 398A - http://www.hvacmechanic.com/ Forums
Original message
| Lodestone1968
 |  "Bryant 90 Model 398A"
, posted Sat 25 Oct 15:44  
I have seen several similar posts, so please forgive me duplicating.
I have a Bryant 90 Model 398A that I can get to start. The inducer motor will start and the pilot light and furnace will come on. The ventilation motor will come on after about 3 minutes. The furnace will run for 30-60 minutes and then will shut off. I have to turn off the power and gas for about 10 minutes and then I can restart the furnace.
I suspect a limit switch or max temp is being met:
Perhaps the inducer motor overload? Motor is very hot.
As I was writing this I turned the thermostat down below the current ambient temperature and the furnace did not shut off. So I am guessing if the furnace never shuts off the thermostat is faulty or wired incorrectly (A new board was put in last year) this would cause the inducer motor to overheat.
I also found some condensate in the enclosure, a small amount. If the condensate drain is clogged, I assume the furnace would eventually shutdown due to pressure or water sensor.
Anyways, I will post more as I know it.
US Navy- Submarine Service- 1987-2007
Please help a chilly veteran thanks!
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Replies:
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| yuri
| "Re(1):Bryant 90 Model 398A" , posted Sat 25 Oct 16:31:
Post the complete model and serial # so we know how old it is etc. It needs to drain properly. Try remove the condensate trap and flush it with hot water and Javex. Flush the drain line also. Slime can build up in them. Check the intake pipe outside the houose for blockage with leaves, spider webs etc. Post a digital pic of it and the burner area on photobucket or imageshack.us so we can see which unit it is. There are several versions of that furnace. Paste the IMG code or pic link here. You will get better answers/help with the pics.
Yuri
[this message was edited by yuri on Sat 25 Oct 16:34] |
| | wondering
| "Re(2):Bryant 90 Model 398A" , posted Sat 25 Oct 18:54
You are early '91 or earlier. Pull the control panel and trap, undo the blower assembly and remove it. With a bright light crawl in and see if you can find your leak in the secondary, or big piles of rust, or the stainless plate on the front of the secondary leaking water or goo. If so time for a new furnace.
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