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  1. #1
    Join Date
    Mar 2011
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    Confused Air Ease Furnace Cycling

    We have an Air Ease Ultra80 oil furnace. (combo forced air heat/AC system). Model # LUF80A112/125D20-2 A

    Last summer I installed a LUX programmable thermostat (TX9100E).

    Had no issues with cooling in summer.

    Now that the heat is coming on, I noticed it is cycling differently than before.

    The furnace always had a purge cycle at end of heat cycle, but now it seems that the unit is going through a short cycle BEFORE the heat cycle as well: furnace fan comes on, runs for a few seconds (with NO HEAT produced), then shuts off. Then, a few seconds later, fan AND burner come on, run a normal heat cycle, then a purge.

    I was wondering if this is a single or two-stage furnace, and I might have the stat wired for the wrong one? I assumed it was a single stage, and wired it according to instructions for a single-stage. Can anyone confirm if this model is a single stage?

  2. #2
    Join Date
    Jun 2001
    Moore, Oklahoma, United States
    Post Likes
    Double check all the installer settings on the Lux thermostat. Review the installation instructions.
    No DIY allowed on this site, so I can't get into details.

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