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  1. #1
    Join Date
    Nov 2009
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    Ducane blower runs continously on power up. No fault codes

    I came here to be edumacated!

    We bought this house that had a brand spanking new Ducane furnace, model 80G1DF. The unit runs continuously regardless of which position the thermostat is set (on/auto). On the cool cycle, when it calls for cooling, i can hear the unit outside kick on and cold air come through, but on heat, nothing happens (meaning the blower still runs, but there is no pre-purge, opening of the gas valve or ignition happening)

    My research is pointing to a open limit switch, but the kicker is that the panel LED is not showing any faults. Its a steady on, indicating normal operation. I thought i would expect a 4 blink fault code.

    Here's what i've done so far though:

    - made sure the filter is new, and cleaned the general area (its new so there is really no dirt anywhere)
    - checked for obvious loose connections
    - tapped on the relays on the main control board to make sure that we don't have a stuck relay
    - replaced the thermostat with two new ones.

    I would appreciate any help or direction with this. The weather is getting cold and it would be nice to have the whole house system running instead of the electrical heaters we are using as backup. We are also limited to our budget, so like many this would be our last resort to make sure we understand the problem, find a possible/obvious solution and/or not be ripped off.

    We kindly appreciate any help/suggestions that you can make.


  2. #2
    Join Date
    Oct 2010
    Anderson, South Carolina, United States
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    Sounds like an open limit to me. I would not call someone coming to your house finding the problem and fixing it then charging a fee for their expertise being ripped off.

  3. #3
    Join Date
    Apr 2012
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    It sounds like an open limit to me as well..... you need to phone some friends a find a contractor they trust.... believe me there are more good ones than bad ones.....find a good one and stick with them.....
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

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