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    dmm1954's Avatar
    dmm1954 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 25, 2006, 04:43 PM
    Gas Heater won't cut on
    Trane natural gas heater (uplow gas fired, single stage, fan-assisted combustion system)
    13 years old
    +I have 2 identical systems and one does not work

    Furnace does not cut on.

    The diagnostic LED on the control unit blinks continuously slowly indicating no call for heat, but I have power to the thermostat and to the control system

    Interior circulation fan does run when I cut on the Fan auto to fan on switch.


    Any place on the internet I can find a diagnostic procedure?

    Mitchell
    bharr07's Avatar
    bharr07 Posts: 22, Reputation: 1
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    #2

    Nov 25, 2006, 09:48 PM
    Try jumping out your t-stat for a call for heat if it starts your t-stat is bad , or maybe the programming isn't set correctly , if that doent work try jumping the heating circuit at the furnace , if it starts the t-stat wiring is faulty , if it still doesn't start , post again
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #3

    Nov 26, 2006, 06:57 AM
    That furnace should have a White Rogers (50A50-... ) PC board. Jumper R to W at the board. Did the light start to flash rapid? Are you sure you have voltage between R and C on the board?
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