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    jordan1977's Avatar
    jordan1977 Posts: 8, Reputation: 1
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    #1

    Jan 11, 2009, 08:50 AM
    Limit switch
    My limit switch come on then go off over and over.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Jan 11, 2009, 08:53 AM
    The unit is probably overheating. Start by checking the air filter.
    jordan1977's Avatar
    jordan1977 Posts: 8, Reputation: 1
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    #3

    Jan 11, 2009, 09:00 AM
    Quote Originally Posted by KC13 View Post
    The unit is probably overheating. Start by checking the air filter.
    I already check the filter its clean and the vent stack is clear of debris
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #4

    Jan 11, 2009, 09:09 AM
    Does the blower run?
    jordan1977's Avatar
    jordan1977 Posts: 8, Reputation: 1
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    #5

    Jan 11, 2009, 09:23 AM

    Yes the blower run good
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #6

    Jan 11, 2009, 09:28 AM
    Is anything blocking or restricting the supply and/or return registers?
    jordan1977's Avatar
    jordan1977 Posts: 8, Reputation: 1
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    #7

    Jan 11, 2009, 09:40 AM

    No the return is close to the ceiling. Can the coil be restricting enough to over heat the unit. I did not check that or could just be the limit switch.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #8

    Jan 11, 2009, 09:47 AM
    An airflow restriction of some type is more likely. If the indoor coil is clogged with dirt, your air filtration is probably insufficient.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #9

    Jan 11, 2009, 10:09 AM
    It could also be a weak or out of range limit switch if all else checks out. You might also check the gas pressure and make sure it is as listed on the furnace label. A furnace that is overfired can also cause this problem.
    jordan1977's Avatar
    jordan1977 Posts: 8, Reputation: 1
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    #10

    Jan 11, 2009, 10:28 AM

    Thank you I will check the coil if that check out I will check the gas pressure. I just want to be sure before I get a new limit switch and have the same problem
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #11

    Jan 11, 2009, 01:25 PM
    Smart move. Many folks just run out and buy a part and think the problem is solved and that in many cases is not the way it works.
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