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  1. #1
    Join Date
    May 2010
    Location
    oklahoma
    Posts
    12

    unit needs resetting over and over??

    Can anyone help with this one? I have this 12 ton carrier package unit that has a call for cooling but compressors arent running or outdoor fans. I got voltage but contactors are not engaging. I was told to just hit the disconnect and give it five minutes and turn it back on and it will run. I took a look at it and and found the contactors wont pull in, with a little nudge they suck right in. any ideals what i can look for. model number 48 HJF 012 571HQ thank you for any help.

  2. #2
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,204
    Check your voltage drop to contactor. Check conductor size.
    Some Talk, Some Do
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  3. #3
    Join Date
    Oct 2009
    Posts
    28
    Sounds like a bad contactor coil to me.

  4. #4
    Join Date
    May 2010
    Location
    oklahoma
    Posts
    12
    i have high voltage and good low voltage to contactor and its not just one contactor its both compressors and outdoor fan contactor

  5. #5
    Join Date
    May 2010
    Location
    LAS VEGAS
    Posts
    18
    Quote Originally Posted by garytulsa View Post
    i have high voltage and good low voltage to contactor and its not just one contactor its both compressors and outdoor fan contactor
    I am not the greatest trouble shooter for sure - but if you have good control voltage, and the coil is not engaging enough to close them, I would think either something wrong with contactor coil -- or more probable as you said someone suggested in your previous post Loose connection somewhere-- possibly the board has a setting of higher than 5 minutes before it can be turned back on ???

  6. #6
    Join Date
    May 2010
    Location
    oklahoma
    Posts
    12
    I have 3 contactors and all of them are not fully engaging. I did ohm out the contactor coils and they tested good. I am getting good voltage at the relay. I didnt ohm out its coil. Today it ran fine. Seems like every other day and up to three times a day i have to pull the disconnect or just push in the coils. i will check out the line voltage at the disconnect and see if i am gettin a full 440. I am not sure where to go from there. thank you for your help so far.

  7. #7
    Join Date
    Apr 2010
    Posts
    21
    Most Carrier unit there is Compressor lock out circuit board for each compressor sometimes unit wont come on when its call for cooling your circuit is open check that first. good luck

  8. #8
    Join Date
    Jun 2009
    Location
    Bakersfield, Ca
    Posts
    1,716

    Confused

    Wait, What? Is this a question, or are you teaching us something??

    EDIT: Sorry, my browser popped up with thread #7 first sorry 'bout that.
    Last edited by DavyB; 05-08-2010 at 12:04 PM.

  9. #9
    Join Date
    Jun 2009
    Location
    Bakersfield, Ca
    Posts
    1,716
    Quote Originally Posted by invisiblecollar View Post
    Sounds like a bad contactor coil to me.
    Sounds like low line voltage to me. time for a new transformer?

  10. #10
    Join Date
    May 2010
    Location
    oklahoma
    Posts
    12
    Not tryin to teach anything dave. I will recheck the components mentioned. Thank you for everyones help. It almost seems like weak magnets but on all three contactors? And the issue is not constant. I am just out of school and starting to see how much I dont know lol. again thanks for everyones time. glad i found the site.

  11. #11
    Join Date
    Aug 2003
    Location
    Western, NY
    Posts
    817
    Sounds like a low voltage problem. One contactor, maybe contactor problem. All three, possible voltage problem. Could be Clo problem also, they act up alot on Carriers.

  12. #12
    Join Date
    Sep 2006
    Location
    Ohio
    Posts
    456
    Quote Originally Posted by garytulsa View Post
    i have high voltage and good low voltage to contactor and its not just one contactor its both compressors and outdoor fan contactor
    Just so I have this right. With a call for cooling you have good low voltage at the contactors but they are not pulled in. If this is the case, I would replace one of the contactors and see if it works.
    Are you sure you didn't check the voltage at the contactor while it was pulled in?

  13. #13
    Join Date
    Jan 2010
    Posts
    6,075
    First this is a 10 ton unit.
    Second fallow the advice of Davy post #9.

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