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    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #1

    Aug 6, 2009, 07:59 PM
    Furnace fan will not come on in "on" position
    My thermostat only had two wires ran to it. I ran a separate wire to the "g" and back to the green wire on furnace but fan will not run. Am I missing something?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Aug 6, 2009, 10:05 PM
    Did you kill the power to the furnace? If not you may have fried the transformer
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #3

    Aug 7, 2009, 07:43 AM

    Yes killed power. Furnace runs fine in "auto"
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #4

    Aug 7, 2009, 08:29 AM

    Remove power. First of all, check to see if you get the same behavior in heat and cool modes.

    Second. Kill power. Remove G at tstat. Connect R to G at furnace.
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #5

    Aug 7, 2009, 12:05 PM

    Furnace runs fine in both modes. I just want to be able to only turn the fan on to move air around the house
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #6

    Aug 7, 2009, 12:10 PM

    No try fan only mode in both modes heat and cool
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #7

    Aug 7, 2009, 12:19 PM
    Quote Originally Posted by rawlidog View Post
    My thermostat only had two wires ran to it. I ran a seperate wire to the "g" and back to the green wire on furnace but fan will not run. Am i missing something?


    Only 2 wires, so you don`t have ac added to heat system
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #8

    Aug 7, 2009, 12:22 PM

    If this is a heat only furnace, then the two wires that are supposed to be connected are W and R.

    Tell me if this is a system where heat or cool is selected at the furnace.
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #9

    Aug 7, 2009, 03:20 PM

    Is a heat only system. W and r are connected.ran separate wire for g
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #10

    Aug 7, 2009, 03:32 PM

    Is there an Rc on your thermostat?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #11

    Aug 7, 2009, 03:35 PM

    Please do as Kiss suggested. Jump r and g at furnace board, make sure you are holding in the blower door safety switch. If blower kicks on, then you have either a problem in the thermostat, or the new wire you ran. Please let us know what you find.
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #12

    Aug 7, 2009, 03:36 PM

    Yes
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #13

    Aug 7, 2009, 03:37 PM
    Rc in thermostat
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #14

    Aug 7, 2009, 03:38 PM

    OK, jump Rc to (Rh or R)
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #15

    Aug 7, 2009, 03:43 PM

    Jumped R to G at furnace fan came on
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #16

    Aug 7, 2009, 03:44 PM
    So how do I wire it so I can turn it off and on at thermostat?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #17

    Aug 7, 2009, 04:03 PM

    Ok, we are getting close to the problem. One more test I need you to do for me, OK? Now jump r and g on the thermostat and let me know if fan comes on.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
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    #18

    Aug 7, 2009, 04:06 PM
    Please let me know if you are working on this as we speak, if so, I will stick around and help you get this figured out. IF you are not going to be around for awhile I may not be back till tomorrow.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #19

    Aug 7, 2009, 04:10 PM

    Jump Rc to (R or Rh) at the thermostat permanently.
    rawlidog's Avatar
    rawlidog Posts: 9, Reputation: 1
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    #20

    Aug 7, 2009, 08:26 PM

    OK so I jumped r and g at the thermostat and fan did not come on.

    Rh rc are already wired together at thermostat.
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