Gas furnace heat exchanger collapse?

Discussion in 'HVAC Heating & Cooling' started by AcidWater, Jan 22, 2014.

  1. AcidWater

    AcidWater New Member

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    Furnace is running & fan blowing, but very little airflow from the ducts. Could the heat exchanger in my 1966 furnace have collapsed, letting the flow go out the flue?

    Is there a way of removing enough of the front to SEE ? IIRC the maker is Montcrief. Something like that. Would have to check the label...

    I did hear a noice that sounded like something falling down, earlier today.

    The only diagnostic I can think of is to let it run very much too long without getting the temperature up.

    This WOULD happen with record breaking cold and 3 more storm systems being watched...
  2. AcidWater

    AcidWater New Member

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    Well now I know that I don't think very well in the middle of the night.

    The filter was clogged, and it could not draw enough air.

    Filter 4 months old exactly; I usually go 5 months. Maybe extra animal fur due to cold winter ???
  3. DonL

    DonL Jack of all trades Master of one

    Messages:
    4,208
    Location:
    Houston, TX


    Good that you found the problem.

    Many people change the filter every 30 days, that may be overkill, depends on the blower run time.

    Some of the better T-Stats keep track of blower run time, and tell you when the filter should be replaced.


    Have Fun.
  4. AcidWater

    AcidWater New Member

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    I think I will install a vacuum gage on the plenum to monitor filter loading.
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