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Heater will not light,ignighter glows,fan comes on,wont light,then shuts off

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  • Anonymous Jan 14, 2009

    heater will not light,ignighter glows,fan comes on,wont light,then shuts off

  • Anonymous Feb 14, 2009

    i have the same exact problem with my goodman-it flashes code 4-for open high limit fault-pls someone help with this

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If your igniter comes on but no ignition, that eliminates the possibility of a bad or clogged pressure switch, high limit or flame rollout switch. Sounds to me like you have a control board, or a gas valve going bad. Could even be some loose, corroded, or faulty wiring. Before the igniter comes on the furnace does a self diagnostics to ensure everything is working, or the furnace will not make it to the igniter sequence. Inducer motor, pressure switch/s, limit controls are closed…then comes on the ignitier, gas valve opens, pilot runners and burners ignite, flame sensor detects the flame, blower comes on and all operations are working.

Hope this helps

Posted on Dec 02, 2008

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www.natex.org

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