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  1. #1
    Own a 90% efficient Bryant model # 398AAZ060100 Series A furnace. The other day I noticed the furnace was off and not calling for heat but the draft inducer fan was running. The only way to turn the draft inducer fan off is by the local disconnect. I replaced the pilot light assembly a few weeks ago and the main circuit board and transformer a couple of years ago. What is causing the fan to run constantly. Appreciate someone advising what is wrong and what part and part number to replace.

    Thanks in advance for any assistance.


  2. #2
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
    Posts
    151

    Induction fan motor

    Just my opiion but you are playing with fire. The on board diagnostics should answer your question but you relly need to have a qualified tech check this out. That fan is a safety feature and is running for a reason. Don't play with fire..

  3. #3
    Join Date
    Dec 2000
    Location
    NW Ohio
    Posts
    516

    Re: Induction fan motor

    Originally posted by mrfixit-ms
    Just my opiion but you are playing with fire. The on board diagnostics should answer your question but you relly need to have a qualified tech check this out. That fan is a safety feature and is running for a reason. Don't play with fire..
    Good advice and by the way this furnace does no have diagnostics and the reason the fan is running has nothing to do with safety. An improper repair has everything to do with safety.

  4. #4
    Join Date
    Jan 2005
    Location
    35 miles from Tunica (casinos)
    Posts
    151
    my error on the safety aspect. I thought the purpose of the IDF was pre purge and post purge the combustion chamber and using pressure swithce or switches to verify if the gas valve can safely open and remove un-combusted fuel. I'm still learning..



  5. #5
    Appreciate the warnings and am well aware of the risk of working on a piece of equipment that involves gas. I am an intelligent person that knows when to call a technician. When a simple replacement of a part will fix the problem I can handle this. The inducer fan is running for a reason. Someone familiar with Bryant furnaces should be able to troubleshoot this issue. The fan is running because some piece of hardware has failed not as a safety mechanism. It has been running for two days there is nothing left to purge or induce. There is a inducer fan control board that controls this fan. As an individual with an engineering degree I would tend to believe that this board has relays and perhaps the furnace being 15 years old that maybe one of the relays has failed closed and the board needs to be replaced. This board is very easy to get to and if bad will be no problem to replace. Before I buy this board I would like a qualified technician to confirm my theory on what the problem is.
    Thanks to those who have posted up to now for the warnings which I am aware of. Would appreciate help on diagnostics.

    Thanks

  6. #6
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Originally posted by biglittledan
    Appreciate the warnings and am well aware of the risk of working on a piece of equipment that involves gas. I am an intelligent person that knows when to call a technician. When a simple replacement of a part will fix the problem I can handle this. The inducer fan is running for a reason. Someone familiar with Bryant furnaces should be able to troubleshoot this issue. The fan is running because some piece of hardware has failed not as a safety mechanism. It has been running for two days there is nothing left to purge or induce. There is a inducer fan control board that controls this fan. As an individual with an engineering degree I would tend to believe that this board has relays and perhaps the furnace being 15 years old that maybe one of the relays has failed closed and the board needs to be replaced. This board is very easy to get to and if bad will be no problem to replace. Before I buy this board I would like a qualified technician to confirm my theory on what the problem is.
    Thanks to those who have posted up to now for the warnings which I am aware of. Would appreciate help on diagnostics.

    Thanks
    Sorry, but I don't think you read forum rules.

    DIY questions are forbidden.

  7. #7
    Join Date
    May 2006
    Location
    Philadelphia, PA
    Posts
    1,374
    Read the site rules then call a tech that can troubleshoot and make the proper repairs to your furnace. Apparently you didn't take Furnace Diagnostics 101 when you were in engineering school.
    Climate Control Solutions for your Home or Office

    Serving Northeast Philadelphia and Surrounding Areas

  8. #8
    Join Date
    May 2006
    Location
    east central indiana
    Posts
    1,117
    Originally posted by biglittledan
    Appreciate the warnings and am well aware of the risk of working on a piece of equipment that involves gas. I am an intelligent person that knows when to call a technician.
    How did you get this same thread into the Tech forum?
    Or did it get moved away from here and you re-posted it?
    Either way no one's going to tell you which part is bad.

  9. #9
    Join Date
    Mar 2004
    Location
    SE Michigan
    Posts
    17,808
    You guys are awesome and make me proud.
    "Politicians are the lowest form of life on Earth. Liberal Democrats are the lowest form of politician"

    - General George S. Patton

  10. #10
    Join Date
    Oct 2002
    Location
    Yo.... Here!, I'm right here..
    Posts
    6,236
    heh
    CES board huh whats the heater serial # and what zip code are you in

  11. #11
    Join Date
    Jul 2006
    Location
    Lancaster,Ohio
    Posts
    464
    Originally posted by biglittledan

    ...The fan is running because some piece of hardware has failed not as a safety mechanism. It has been running for two days there is nothing left to purge or induce. There is a inducer fan control board that controls this fan. As an individual with an engineering degree I would tend to believe that this board has relays and perhaps the furnace being 15 years old that maybe one of the relays has failed closed and the board needs to be replaced. .

    Thanks
    the only proper action for you to take (considering you education and intelligence) is for you to do what you know needs to be done. Then you can come back and boast how you were able to solve the problem all by your self and how we service techs over value our skills and knowlege.
    IcyFlame

  12. #12
    Have never seen so many jerks on a website at one time!!!!!!!!!! You all complement each others arrogance very well. Asked a basic question and for some help and to date have gotten nothing but sarcasm. Not a single one of you rocket scientists has stepped up to the plate to help. Thanks for nothing!!!!!!!!! I hope the webmaster pulls this listing because I am embarassed for the whole bunch of you guys that claim to know what you are doing.

  13. #13
    Join Date
    Mar 2004
    Location
    SE Michigan
    Posts
    17,808
    Dan, we are following the rules. If you register as a professional and post in the Pro's forum, we shall certainly help you.

    Happy holidays!
    "Politicians are the lowest form of life on Earth. Liberal Democrats are the lowest form of politician"

    - General George S. Patton

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