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  1. #14
    Join Date
    Oct 2005
    Location
    Omaha, NE
    Posts
    309
    Quote Originally Posted by coolwhip View Post
    Why?...if its choked, it can take a dump alot faster than that.
    What does "choked" mean?

    Is it:
    1. dirty airfilter restricting air flow through the HX?
    2. Or blocked flue that does not allow hot air to exit?

    Please explain (I want to learn how to prevent this from happening)

  2. #15
    Join Date
    Apr 2007
    Location
    MN
    Posts
    297
    Any combination of installation errors/factory defects/or lack of maint. can contribute to premature failure.
    S**t or get off the pot!

  3. #16
    Join Date
    Jul 2001
    Location
    VA
    Posts
    2,801
    Quote Originally Posted by cn View Post
    I find it hard to believe that a HX on a 80% Carrier goes out in 10-11 y?

    You shouldn't..... I've condemed many many Bryants and carriers in that age group, and younger.
    ___________________________________________


  4. #17
    Join Date
    Aug 2007
    Location
    MN
    Posts
    2,677
    Quote Originally Posted by cn View Post
    I find it hard to believe that a HX on a 80% Carrier goes out in 10-11 y?
    never seen one installed improperly? Or the filters only get changed when the limit gets replaced? 11 yrs is a lot of abuse, not saying the OP doesn't take care of it, just one of the many reasons for premature failure. But I wouldn't replace a heat exchanger on ANY 11yr old furnace, all the other parts are too old to expect them to last long enough to justify the cost, not sure what everyone else charges for the HX replacement, but our price would make me go with a new furnace.
    You can't fix stupid

  5. #18
    Join Date
    Dec 2006
    Posts
    82
    Slightly OT rant here....

    Why the heck aren't furnaces designed so triggering a limit switch lights a big red fault light somewhere that the homeowner can see? Sort of like the equivalent of a car's "check engine" light. Many times a homeowner doesn't even know this is happening.

    Case in point: me.
    I learned about the problem my 80% Heil was having because I heard the limit switch cycling from the bedroom (due to an acoustic trick in the venting) one day while the furnace was in morning recovery mode. Turned out there were two metal "pre filters" for the original Honeywell electrostatic behind the filter. The original homeowner had deactivated the POS electrostatic and replaced the electrostatic elements themselves with a pleated equivalent but had left the pre-filters in place.

    I diligently replace my furnace filter and was surprised as hell to hear the furnace cycling on the limit switch. Imagine my further surprise when I inspected behind the filter and found the 2 fully clogged pre-filters (now removed).

    So now I've wired in a relay based sensor circuit that detects limit switch cycling (voltage to "R" drops when the limit switch activates on my Heil) and lights that big red light on my VisionPro 8000 TStat. The light can only be extinguished by power cycling the furnace.

    All furnaces should have easily visable "Check Engine" lights IMO. You guys would do more business. Homeowners would be safer.

  6. #19
    Join Date
    Apr 2007
    Location
    MN
    Posts
    297
    All furnaces should have easily visable "Check Engine" lights IMO. You guys would do more business. Homeowners would be safer.[/QUOTE]

    All newer furnaces will go into a "hard lockout" requiring the power to be cycled to reset the high limit fault code. This fault code can be read through the front panel(some easier than others) via the LED on the control.
    S**t or get off the pot!

  7. #20
    Join Date
    Dec 2006
    Posts
    82
    Well, that's certainly an improvement. Must be a recent one too. My Heil is a 2002 model.

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