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Have 20 year old split carrier system, tried to turn a/c on today nothing, no fan, blower, do have power to a/c both in and out. Any help

Have 20 year old split carrier system, tried to turn a/c on today nothing, no fan, blower, do have power to a/c both in and out. Any help

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  • garjan6002 May 28, 2009

    Thx to the both of you. The door switch worked itself loose, reinstalled and now have air.



    Thx again

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I assumed that when you say AC power is both in and out, you mean both the indoor and condensing unit has AC power. Check if the unit is equipped with in-line fuse. If not, and you have a rotary switch, try to check the terminal continuities. If it is an electronic switch, try to replace the card.

Posted on May 28, 2009

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First thing is that if u in fact have voltage to the furnace and condensing unit check the primary and secondary sides of the transformer on the furnace. if you dont have 120 on the xfrmr test the door switch and 120 v connection to outlet. if you are good there check the secondary side of the transformer and see if u have 24 volts leaving the trans. if you have 24 v leaving the trans. you should have 24 to the stat if there is not a blown fuse on the control board. check the transformer for power. if there is power there see if theres a fuse on the control board at the furnace. if thats not blown check stat operation pull stat off and jump r to y which should engage cooling. jump r to g which should engage fan. this is all of course if u have a standard a/c and not a heat pump unit. if u can jump cooling or fan replace the stat. let me know more when u get there.

Posted on May 28, 2009

  • shizznat May 28, 2009

    damn door switches.

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