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  1. #1
    Join Date
    Jan 2009

    Confused Need Low Voltage Help

    I hope someone can help I must be over looking something. Heil gas furnace single stage heat and cool. I did not have 24 volts at the transformer (i did have 120 on primary) so I replaced the transformer. I now have 24 volts yet no voltage on the t-state terminals of the board so I replaced the board. hooked up all the wires double check powered up and blow the 5 amp fuse. (thank god for the fuse). I then removed all low voltage wires replaced fuse powered up and everything is ok. Installed low voltage wires fuse blows. I removed the thermostat replace fuse powered up everything OK. Put R & W together heat works fine. So I thought must be t-stat replaced stat confirmed wires on computer board and stat powered up and blow the fuse. I then removed Y & G from stat replaced fuse powered up and heat works perfect.
    Any idea why when Y & G are hooked on the stat up I am blowing fuses ? I even un hook low voltage to condensor. Really need help thanks anyone.

  2. #2
    Join Date
    Aug 2002
    Southold, NY

  3. #3
    Join Date
    Feb 2003
    site rules no diy

  4. #4
    Join Date
    Nov 2008
    Meriden, Kansas
    You obviously know some things about electricity but it is time to call a service company. You are just switching parts without really understanding how it works. You have probably spent more on parts then the whole repair by a pro will cost you.
    Anything I say here is only my opinion. Even if you understood what I said.... What I said may not even be what I meant.

  5. #5
    Join Date
    Jun 2001
    Louisville, KY
    Thanks for reporting this thread.

    Waaaaaaay beyond the rules in the deleted posts.

    Thread closed.
    Perhaps you should have read the instructions before calling.

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