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Just installed new Goodman 95% updraft furnace with 3" supply and vent lines going out through wall. Gas valve won't open. Circulation blower runs in manual on, A/C system runs fine. I have used an ohmmeter and voltmeter to do checks. The entire series of safety switches are closed. When the small blower is running, both pressure switches close. The igniter comes on but there is no voltage to the gas valve. Just after the igniter goes off, I hear a relay click, the circulation blower seems to be starting and I get voltage to the gas valve for about 1/2 second. The circulation blower is not coming on at all in the ignition cycle except "trying" after the igniter goes off. There are no flashing codes except a single flash after 3 tries. Should I ask for a new circuit board or are there other things to check?

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Make sure you have bled your gas lines. If any air is in the lines, it will cause the unit to do exactly what yours is doing. The relay "click" you hear is the gas valve opening, but if there is no gas, it will not ignite. This is common for a new install. I hope this helps or at least points you in the right direction! Good luck!

Posted on Sep 28, 2010

  • Brandon Berry
    Brandon Berry Sep 28, 2010

    Also.....Sometimes I even forget to make sure the gas valve switch is in the on position, you might check that also!

  • jdwright81 Sep 28, 2010

    I had to install an LP kit (nozzles for the burners and springs for the gas valve) and the instructions for initial setting of the hi and low screws were VERY unclear. I tried a different interpretation of the screw setting instructions and was able to get it to light and then adjust with a manometer. Your comments were right on - there was no gas - but I had totally forgotten about the LP conversion and the confusing regulator setting instructions.

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