Bryant Induced Draft Motor sporadic starting


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Old 12-27-09, 09:23 PM
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Bryant Induced Draft Motor sporadic starting

Hello.
I have a Bryant 330AAV 80+ Two Stage gas furnace. noticed the Induced Draft Motor not wanting to start and/or stay running and Code 32 flashing. I have noticed that the low pressure switch is faulty, but I believe a problem exists with the IDM as well. When I reset the breaker for the furnace, the blower motor runs for 90 seconds and then the IDM is supposed to kick on. Occasionally it will start and stay running at which time I have to manually open the low pressure switch to get the burner/flame stage to progress. During the few times that this will work, the furnace seems to run okay for a while. The problem is that alot of the time the IDM will start and die-out a half-dozen times or so and eventually stop trying to run altogether. I can only alleviate this by resetting the breaker and hoping that this time the IDM will stay running. When the IDM wants to start, there is an odd buzz/squeal from the Control Board. I assume the relay for the IDM is located therein. I have the sneaking suspiscion that the board is bad along with the pressure switch. Any tips?
 
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Old 12-28-09, 08:18 AM
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I would say your board diagnosis is correct. You need to correct the inducer problem before you condemn the pressure switch.
 
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Old 12-28-09, 06:03 PM
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Just so you know: Generically speaking - if you have a 3-wire pressure switch and condensate water is not draining as it should - this can hold "open"(when it should be "closed", called "normally closed" or NC for short, as labeled on the PS) the PS from allowing the IDM to start. Then, because water is trapped down by the secondary exchange or in the IDM, then the PS can cut out on the high end due to insufficient vacuum draw.
 
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Old 01-29-10, 03:19 PM
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Originally Posted by Beeve
I have a Bryant 330AAV 80+ Two Stage gas furnace..... When the IDM wants to start, there is an odd buzz/squeal from the Control Board. I assume the relay for the IDM is located therein. I have the sneaking suspiscion that the board is bad along with the pressure switch. Any tips?
Hi-
I have a Carrier 90+. Your IDM issues sound familiar. My furnace failed with IDM symptoms similar to yours. The tech swapped out the control board, and things worked again.

It's probably the ID Relay. The one on my board was rated for 100k actuations, a figure reachable in a few years if the furnace cycles enough.

I bought a new control board on ebay, just in case.

Hope this helps.
 
 

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