Amana Furnace Blower problem

Discussion in 'HVAC' started by MILL123, Nov 13, 2008.

  1. Nov 13, 2008 #1

    MILL123

    MILL123

    MILL123

    New Member

    Joined:
    Nov 13, 2008
    Messages:
    1
    Likes Received:
    0
    I have a pair of Amana 90% efficient gas furnaces model #'s GUC045B30B which were installed in 1990. On one of the furnaces, the blower does not go on half of the time. The electric ignitor ignites, gas is released & the furnace heats up. It then attempts to start the blower but half the time the blower never starts up. It sometimes makes (3) attempts or so & then shuts down. The wheel inside the blower moves easily & is not stuck. Could this problem be caused by a faulty switch or relay? Any help is appreciated.

    Thank you.
     
  2. Nov 13, 2008 #2

    kok328

    kok328

    kok328

    Well-Known Member

    Joined:
    Nov 20, 2007
    Messages:
    2,755
    Likes Received:
    249
    It could be a faulty switch or relay. It could be a bad contactor, it could be a bad fan motor capacitor, it could be a bad limit switch or it could be a bad fan motor.
    Only handson troubleshooting will yield the correct answer.
     
  3. Sep 26, 2012 #3

    bwood316

    bwood316

    bwood316

    New Member

    Joined:
    Sep 26, 2012
    Messages:
    1
    Likes Received:
    0
    furnace ignitor not coming on and blower not coming on as well
     
  4. Sep 26, 2012 #4

    Wuzzat?

    Wuzzat?

    Wuzzat?

    Well-Known Member Sponsor

    Joined:
    Jan 20, 2010
    Messages:
    2,471
    Likes Received:
    175
    The voltage across the closed blower motor relay contacts should be less than 0.1V.

    Post a schematic and we can step you through it.

    Do not replace parts by trial and error; sometimes it's just a corroded connection that you can fix with fine sandpaper and sometimes the new parts will immediately burn out because you haven't found the root cause.

    BTW, one forum survey had the avg. residential HVAC lifetime to be 23 yrs, with a max of 80.
     
    Last edited: Sep 26, 2012

Share This Page