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  1. #1
    Join Date
    Mar 2007
    Posts
    23

    Hmm Amana roll out switch

    Hi All,
    I replaced a blower motor and a WR control board on a Amana GUCA 13 year old furnace worked 1 day then no heat fan run all the time. Tripped out on roll out reset and furnace runs great for 5 starts and no sign of any rollout. Next day no heat same thing no signs of roll out with and without cover on. kind of weired worked ok until I had to replace fan and board. Any thoughts

  2. #2
    Join Date
    Feb 2008
    Location
    Altmar, New York, United States
    Posts
    4,521
    are you sure it's a roll out and not a limit? if so, check the hx. i find it odd you changed the board and blower motor at the same time. was it flooded or something?

  3. #3
    Join Date
    Feb 2009
    Location
    Winnipeg MB
    Posts
    13
    could it be a crack in the heat exchanger that's only opening up after the furnace runs for awhile?

  4. #4
    Join Date
    Mar 2007
    Posts
    23
    Replaced the blower motor on start up the board died.

  5. #5
    Join Date
    Mar 2007
    Posts
    23
    good point maybe when the HX gets hot it open up.

  6. #6
    Join Date
    Feb 2012
    Location
    Durham, NC
    Posts
    73
    Delta T? Dirty air filters? Collapsed duct work? Dirty Evap coil?

    I'm thinking airflow since the problem occurred after you changed blower motor and control board.

    How did you set your fan speed?

    Have you tested the RO switch to see the point that it opens? Those things are made in china.

  7. #7
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,912
    Quote Originally Posted by dex1 View Post
    kind of weird worked ok until I had to replace fan and board. Any thoughts
    Not weird at all, if the blower was out, this is probably why the flame never rolled out. I would no doubt be looking at the HX really good. Why did you change the fan and board if it worked ok?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  8. #8
    Join Date
    Jan 2013
    Location
    Frederick, MD
    Posts
    52
    If its the roll out and not the limit I would not think it has anything to do with the blower and board replacement. I would be looking at the HX and venting.

  9. #9
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,912
    Quote Originally Posted by Frederick_Tech View Post
    If its the roll out and not the limit I would not think it has anything to do with the blower and board replacement. .
    So if you have a grand canyon size crack in the HX the blower will not effect the roll-out?
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  10. #10
    Join Date
    Apr 2011
    Location
    michigan
    Posts
    172
    could be the secondary hx is plugging up I had a carrier do the same thing would work ok for a couple of days and intermittently trip the rollout switch, while you had the blower out did you check the secondary hx?? I have had a lot of the secondary hx plugged with dirt and pet hair. Is it the same rollout switch tripping?? Can you try swapping it with one of the other rollout switches assuming it has more than one, to see if it is a bad switch??

  11. #11
    Join Date
    Jan 2013
    Location
    Frederick, MD
    Posts
    52
    Sure. But not likely this "Grand Canyon" crack appeared at the same time the blower was replace. With no symptom of the crack before.

  12. #12
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
    Posts
    1,018
    Where is the furnace getting it's combustion air from? Is it located in a closet?
    "The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
    "Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twain
    http://www.campbellmechanical.com

  13. #13
    Join Date
    Aug 2010
    Location
    Northern Cali
    Posts
    72
    is the new blower motor right rotation?

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