Carrier Weathermaker 2900: PCB problem?

Discussion in 'Home Repair' started by MikeE, Aug 20, 2004.

  1. MikeE

    MikeE Guest

    Hi ppl.

    Carrier Weathermaker 2900. Approx 4 years old.

    I noticed the blower wasn't working when thermostat kicked in. Went to
    basement, opened machine. things appear fine, but per service-sheet there is
    no light coming from LED.

    Tested with VMeter for ~110 at L1/L2 and 24 VAC at S1 S2. All checks out.
    (although the xformer seems to buzz slightly, but I guess that could be
    normal.)

    Fuse looks good 2. Even with service-switch closed, I can't get LED to come
    on. (although it did come on once for me, but I can't seem to repeat that...
    strange fluke.)

    anyway... does it appear that I have to go spend $200 on a new "hk32fz011
    PCB for this unit?... grrrr.. way 2 much $$ for that part....

    Does anyone know of any component-level issues that can cause this sort of
    failure... as I would prefer to replace that part obviously...
    (althogh if the DIAG-piece is busted, it could be the main ICs that are
    fried, and thats the end of that...)

    Is the PCB the problem for sure? (obviously I don't want to spend $200 on a
    part that isn't the problem...)
    [ should I pull*all* the wires OFF and try to run it with just the
    power-feed attached to trully isolate the problem, or is that not worth
    it. ]

    Any assistance/insight for a HVAC newbie would be much appreciated.

    thanks -- MikeE
    MikeE, Aug 20, 2004
    #1
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  2. "MikeE" <> wrote in message
    news:eek:...
    > Hi ppl.
    >
    > Carrier Weathermaker 2900. Approx 4 years old.
    >
    > I noticed the blower wasn't working when thermostat kicked in. Went to
    > basement, opened machine. things appear fine, but per service-sheet there

    is
    > no light coming from LED.
    >
    > Tested with VMeter for ~110 at L1/L2 and 24 VAC at S1 S2. All checks out.
    > (although the xformer seems to buzz slightly, but I guess that could be
    > normal.)
    >
    > Fuse looks good 2. Even with service-switch closed, I can't get LED to

    come
    > on. (although it did come on once for me, but I can't seem to repeat

    that...
    > strange fluke.)
    >
    > anyway... does it appear that I have to go spend $200 on a new "hk32fz011
    > PCB for this unit?... grrrr.. way 2 much $$ for that part....


    ? That's pretty cheap. I would have a more experienced diagnosos before I
    started throwing parts at it though.


    >
    > Does anyone know of any component-level issues that can cause this sort of
    > failure... as I would prefer to replace that part obviously...
    > (althogh if the DIAG-piece is busted, it could be the main ICs that are
    > fried, and thats the end of that...)


    Doubtful.

    >
    > Is the PCB the problem for sure? (obviously I don't want to spend $200 on

    a
    > part that isn't the problem...)
    > [ should I pull*all* the wires OFF and try to run it with just the
    > power-feed attached to trully isolate the problem, or is that not worth
    > it. ]


    It wouldn't be worth it.

    >
    > Any assistance/insight for a HVAC newbie would be much appreciated.


    Get the opinion of someone, i.e a contractor, so you can be sure that the
    part you're testing is in fact the problem. It's just too hard to guess
    over the internet.

    - Robert

    >
    > thanks -- MikeE
    >
    >
    >
    >
    American Mechanical, Aug 21, 2004
    #2
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