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    chuckkailo's Avatar
    chuckkailo Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 20, 2013, 06:42 PM
    High limit switch
    I have a concord 80 plus gas furnace and the red light blinks four times indicating that the high limit switch is on. Is there anything I can do to fix it myself?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #2

    Jan 21, 2013, 07:20 PM
    Make sure the air filter is clean & not highly restrictive (pleated 1"). Check for blocked or closed vents. Check the blower wheel to verify it is clean.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #3

    Jan 22, 2013, 05:33 PM
    Yep, first step is checking/changing the furnace filter/s. Let us know if that does the job. If not, let us know and we will take the next step.
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