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  • Lennox G12 blowing w/o heat

    Pilot light is lit but not getting 24 volts to gas valve.

    Checked for 24 v at gas valve. When furnace calls for heat, blower motor kicks on but no 24 v.

    Recently replaced blower motor.

  • #2
    Re: Lennox G12 blowing w/o heat

    You need to get a qualified service tech out to inspect your heat exchanger. Lennox G8, G9, G10, G11, and G12 have heat exchangers that are very prone to cracking.

    The problem youre experiencing is more than likely caused by a burned fusible link on a wire leading to the gas valve. The blower will run because it is timed on and off. Which tells me you have line voltage, low voltage, and 24v to the stat.

    Get that heat exchanger looked at before you run it.