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    ciano heating and cooling's Avatar
    ciano heating and cooling Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 13, 2008, 06:40 PM
    Need to now what causes this intermitent riring
    I have a concord gas furnace when t stat calls the flame fires up then shuts down again this this tries this 3 to 4 times before it will stay ignited through cycle.this is a high efficiency gas furnace model rgu90a100d14-1b serial 8497g14263
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Mar 13, 2008, 06:45 PM
    Clean your flame sensor or replace.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
    Ultra Member
    		  
    #3

    Mar 13, 2008, 07:45 PM
    I agree with the info you gave it sounds like the flame sensor is dirty. Turn the power off to the furnace and scrape it with a knife.(If you use sand paper to clean it the glue from the paper may stick to it making it worse than before)
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member
    		  
    #4

    Mar 14, 2008, 10:26 AM
    I`ve found steel wool to work very well
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