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Attic Vent Fan - where to start troubleshooting

Discussion in 'Garage / Workshop' started by kingston73, Jun 18, 2011.

  1. Jun 18, 2011 at 9:36 AM
    #1
    kingston73

    kingston73 [OP] Well-Known Member

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    The wife and I have only lived in our house for about a year and I'm slowly fixing the small things that I find wrong. Our attic has a fan attached at one end with a small junction box with a knob to set the temp the fan comes on at, but as far as I can tell it doesn't work and never turns on. It did work when we had it inspected, so something changed/broke/stopped since then and I don't have a clue where to even start with trouble shooting. I'm ok with wood work and plumbing but I'm a raw novice when it comes to electricity, so any help or suggestions would be greatly appreciated.
     
  2. Jun 18, 2011 at 9:48 AM
    #2
    OH-MAN

    OH-MAN Well-Known Member

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    Start at the breaker box, see if any breakers are tripped.
    If one is hopefully flipping it back will make it work.
    If not proceed up and see if the fan can move freely.
    Moves then see if you have power to it with a meter.
    Check it before the stat control and after it may be the controler.
    Be carefull.
     
  3. Jun 18, 2011 at 10:04 AM
    #3
    steviestyles

    steviestyles The "Search" tab is your friend!!

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    Check to see if there is a switch for the fan; ours was wired to a light switch in the attic. Even though the fan is on a thermostat switch chances are likel that there will be a standard on/off switch. Of course, check the breaker box. Last but not least, it could be the fan motor or bearing is out and the fan needs to be replaced. Most attic fans run about 10-15 years.
     
  4. Jun 18, 2011 at 12:18 PM
    #4
    kingston73

    kingston73 [OP] Well-Known Member

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    I looked high and low for a switch and didn't find one.

    I did try spinning the fan and it definitely isn't "free", it spins but with a lot of resistance, like a friction drag on a fishing reel.

    I have a multi-meter but am not really sure what I should do with it, I don't want to electrocute myself.

    Fuse box is good, no tripped switches. I'm pretty sure the fan is from HomeDepot, seems like the former owner bought a lot of his house from there, and the reviews seem to agree that the fan isn't great and often dies after a few years, so I'm wondering if that might be it. I don't want to just go buy one ($100) without testing the current one first.

    Thanks for the replies so far, ideas for testing the fan and instructions on what exactly to do with my multi-meter are greatly appreciated!
     
  5. Jun 19, 2011 at 5:53 PM
    #5
    fvtalon

    fvtalon Well-Known Member

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    If the fan doesn't spin freely the bearings are probably piled up and that's your issue. What you can do is take it out and take it apart and grease/lube the bearings/bushings. Probably better off getting a new and better fan if that one is a POS though.

    For any electrical work, if you're not real comfortable with it consider finding someone who is. Also I highly recommend those pencil type voltage testers. Like this:

    [​IMG]

    The one like pictured will flash intermittently when it's on verifying the unit is working then they blink real rapidly and beep when voltage is present. You just need to hold it near or against a wire to see if it's hot before you go sticking your fingers in there.
     
  6. Jul 8, 2011 at 9:05 AM
    #6
    kris77

    kris77 Born in the Backwoods

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    I have the same issue. I have one of those attic fans that looks like a huge mushroom on the roof. Got some kind of thermostat on it and it don't work either. Way to hot up there to work on it right now, but it would probably help my A/C bill if I would just man up and get up there and fix it...lol
     
  7. Jul 8, 2011 at 9:27 AM
    #7
    t4daddy

    t4daddy Well-Known Member

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  8. Jul 9, 2011 at 2:16 PM
    #8
    Tommo

    Tommo Well-Known Member

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    During hot weather, best time to work in the attic is early morning about 5AM when it has cooled down. Had several attic fans and they last 7 years here in NOVA where it is hot and humid in the good old summertime. Best to just get off the dime and buy a new one.
     
  9. Jul 12, 2011 at 9:41 AM
    #9
    ian408

    ian408 Well-Known Member

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    I'll second the recommendation of finding someone to help if you're not comfortable working on it yourself.

    If you've checked the breakers and they're all on, I would work my way back from the fan's electrical connection and see if there's power at the fan motor. If not, then test in front of the thermostat. If you don't have power at the thermostat, then there's probably a switch somewhere that's not obvious so follow the wires to see if you can find it. If you have power at the thermostat but not at the fan, there's a problem with the thermostat and bypassing it should make the fan run.

    Good luck.
     
  10. Jul 12, 2011 at 9:46 AM
    #10
    jivewalker

    jivewalker me gusta pechos firmes

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    sounds like the motor is bad. pick up a new motor and install. I've done this several times, not too difficult, just take your time and make sure the power is off. Hardest part is getting the motor back into the bracket centered correctly and fan blades back on. Good luck, you can do it.
     
  11. Jul 12, 2011 at 9:53 AM
    #11
    Crom

    Crom Outside...

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    Yup. Change that bad boy out. Been there done that. It's not too bad.

    My experience was the same, we had a light switch in the closet where the heater was that controlled the fans. No sense running them in the winter.
     
  12. Jul 12, 2011 at 9:55 AM
    #12
    4FTTY4

    4FTTY4 Member

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    Make sure there's not a light switch in the house somewhere that controls the fan. Mine was behind a door in a hallway downstairs and took a month for me to figure out what it was for...
     
  13. Jul 12, 2011 at 10:04 AM
    #13
    puckstopper55

    puckstopper55 Well-Known Member

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    The fan the OP is talking about is a gable vent fan (http://www.homedepot.com/h_d1/N-5yc...splay?langId=-1&storeId=10051&catalogId=10053)

    Its mounted on 2 vertical studs that go right on either side of the gable vent. This fan is basically a large fan blade pressed onto a motor shaft. The fan has a thermostat with a dial like knob, and has settings for different temps (I have mine kick on at 100 F). From the thermostat box it had the usual White, Black, and Ground conductors.

    I had to replace mine the month I moved into my house because it was shaking the whole wall. My fan was so out of balance, and for the price, it didnt pay to try and fix it.

    Find out what that thermostat box connects to. It should go to some sort of junction box. Trace some other wires from that junction box and see if you can figure out where they go to. They may go to some switches that you dont know what they do (I still have 3 or 4 of them after 2.5 years of being in my house).

    If you cant figure anything out, the next step is to see if the fan is getting power (as mentioned above). Find the junction box I mentioned earlier and take the cover off. With your Multi Meter (set the dial to 200 AC V) touch the negative lead (black) to the white (neutral) wires (you may have to remove a wire nut to get to the actual copper part of the wire), and touch the positive lead (usually red) to the black (hot) wire. At this point you should see something about 120 V. If you dont, you know this circuit isnt live. If you do see 120 V, go turn off this circuit breaker and reinstall the wire nuts).

    You now know that the fan is bad and needs to be replaced. This is as simple as 4 screws into the studs and connecting the white to white, and black to black. PM me with any questions.
     
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