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  1. 03-06-2013, 04:30 AM #1
    jayrod2
    jayrod2 is offline Regular Guest
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    Cant figure this out! Not getting 24v at the board or thermostat

    Its a Carrier split unit. Had the heater on yesterday and at some point when I wasnt around it turned off on its on. Its completely dead at the thermostat, and on the circuit board it doesnt get 24 volts either. So I tested voltage going into the transformer and it has 120 volts on all 3 wires going in but it only has .1 volts on the 24v side. Well thats not right. We have a 2 story house and both units have the exact same transformer so I measured the transformer on the working unit to be sure Im dong it right and it measures 120v on all 3 coming in, and about 27 volts going out. So I go and buy a new transformer, wire it up, and still no 24 volts! Did a resistance check, all wires have some resistance. So now Im stumped. If it has voltage coming in, how is it not coming out!? What should I check next?
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  2. 03-06-2013, 05:23 AM #2
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    jpsmith1cm
    jpsmith1cm is online now Global Moderator/AOP Committee
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    What should I check next?
    The Yellow Pages would be a good choice.

    This isn't a DIY site
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  3. 03-06-2013, 07:01 AM #3
    jayrod2
    jayrod2 is offline Regular Guest
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    Quote Originally Posted by jpsmith1cm View Post
    The Yellow Pages would be a good choice.

    This isn't a DIY site
    Lol, I hear ya.
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  4. 03-06-2013, 08:06 AM #4
    toocoolforschool's Avatar
    toocoolforschool
    toocoolforschool is offline Professional Member*
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    Three wires going in? Your in over your head.
    Certified parts changer.
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  5. 03-06-2013, 12:57 PM #5
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    TwincamDave
    TwincamDave is offline Professional Member*
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    Quote Originally Posted by toocoolforschool View Post
    Three wires going in? Your in over your head.
    He is probably reading from leg to ground/neutral which would be 240 across the 2 hot legs.But not sure, he is in over his head though.
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  6. 03-06-2013, 01:02 PM #6
    lentz
    lentz is offline Professional Member*
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    For goss sakes call someone thats know what they are doing.
    Blue Fox
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  7. 03-06-2013, 04:07 PM #7
    wahoo
    wahoo is offline Professional Member*
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    We are forbidden to assist with DIY repairs! Call a pro. Sorry
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  8. 03-06-2013, 04:44 PM #8
    catmanacman
    catmanacman is offline Professional Member*
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    im wondering if the low volt fuse is bad ,also wondering what could have burned it out .a skilled service tech should be able to quickly find the problem and repair it
    The governent can not give anything to someone that it has not first taken from someone else
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