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Thread: pressure switch

  1. #1
    Join Date
    May 2007
    Location
    california
    Posts
    223

    pressure switch

    How often does a pressure switch for an inducer draft motor actually fail. What is typically the underlying problem

  2. #2
    Join Date
    Jan 2008
    Location
    West Valley City, UT
    Posts
    157
    I've replaced two this year (so far), both were about 3-ish years old.

  3. #3
    Join Date
    May 2007
    Location
    california
    Posts
    223
    The furnace is a 3 year old tappan . The tech that came out said he could not get a pressure switch for a tappan .

  4. #4
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    Quote Originally Posted by jmiles View Post
    How often does a pressure switch for an inducer draft motor actually fail. What is typically the underlying problem
    they can last for 1 day

    they can last for 1 year

    they can last for 10 years

    it all depends on a variety of circumstances



    .

  5. #5
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

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    Quote Originally Posted by jmiles View Post
    The furnace is a 3 year old tappan . The tech that came out said he could not get a pressure switch for a tappan .
    thats a sad day when you cant get a part for a 3 year old system

    seems like he was not looking good enough!



    .

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,808
    3 year old Tappan. Its still under part warranty.
    Look in the phone book for Tappan dealers, they will have it, or be able to get it.


    Pressure switches don't go bad often, But are quit often condemned for doing their job.
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    How many times must one fix something before it is fixed?

  7. #7
    Join Date
    Oct 2005
    Posts
    69

    Smile

    pressure swithes have a rubber diaphram inside them. eventually they will stretch enough that they don't make the circuit. They can also become erratic when there are minor obstructions in the orifice at the furnace,inside the tube etc.If the inducer doesn't get up to speed, the pressure switch also will become erratic. I've seen numerous ones changed, only to find out it had a different problem. You need to verify the failure mechanically and electrically.

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