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  1. #1

    Nordyne M3R limit switch tripping

    Hi all,
    I have a Nordyne M3R series furnace in my Modular home, it is 5 years old. Last year it kept tripping the limit switch located on the exhaust motor area. I replace the plastic orifice located in the unit and it worked fine. This year, it started tripping it again, I replaced the orifice again, and the limit switch. The switch keeps tripping and i had to remove it from the furnace area so the heat wouldn`t trip it. i know this is a bad idea, but I needed heat at that moment. The motor on the exhaust fan is exposed in a way i can touch it. it gets hotter than hell, almost too hot to touch, the PVC exhaust pipe gets pretty war too. Any ideas why it might be tripping the switch? I`m going to climb up on the roof tomorrow and see if the exhaust pipe is clogged.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,048
    You need a tech to check out whats wrong. before you burn down your place.
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    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Jul 2001
    Location
    Anderson,SC
    Posts
    997
    Call tech support, check correct limit switch degree.

    Stud

  4. #4
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,842
    You have a dangerous condition and need to have it remedied immediately. Messing with a safety devise is not the smartest thing to do. It's there to prevent what ever is occuring in your furnace and you have eliminated that safe guard.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


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