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    gingerthunder's Avatar
    gingerthunder Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Oct 14, 2009, 05:08 PM
    Bryant furnace no heat
    Have bryant 90 plus furnace model #398aaz036080 20 years old breaks once a year
    New problem vent motor turns on pilot lights burner doesn't light turns off in 5 minutes
    Cleaned fresh air and exhaust vent known concerns
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 14, 2009, 07:56 PM
    Check gas supply
    Check gas valve voltage during cycle
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member
    		  
    #3

    Oct 14, 2009, 08:57 PM

    I'm not real familiar with that unit but,it sounds like it has an intermitent pilot. Does it have a spark ignitor on the pilot? If so it may just be a dirty flame sensor, not allowing the pilot to be sensed there for not bringing the burners on.
    gingerthunder's Avatar
    gingerthunder Posts: 2, Reputation: 1
    New Member
    		  
    #4

    Oct 14, 2009, 09:01 PM
    Gas supply is OK pilot light found problem with furnace had failed fame sensor install new senosrfurnace works fine thanks for the help
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Oct 14, 2009, 09:02 PM
    Yep those flame sensors can be a problem. Sometimes you can clean them.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member
    		  
    #6

    Oct 14, 2009, 09:12 PM

    I'd save the old one as I'm sure it just needs cleaned, about 90% of the time cleaning does the trick.

    Another thing, make sure you have a good strong pilot when it lights, a furnace this old may have some build up in the pilot orfice,pretty common problem.
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