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Have a AC unit working for two years great all of a sudden outdoor unit stops push the contactor in and outdoor fan and compressor come on but will not stay on have 24 volts and fuses are fine any ideas

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Most likely you have either a low or high pressure cutout switch that has shut the unit down. One will be located on the suction line (larger tube) the other on the high pressure line (small tube). If you have both high & low shitches they are tied together in series and in order to bypass them you need to trace them back to the contactor . Pull cutout switch by the unit to disconnect power. Do NOTHING inside the box with power on. You will see they tie together somewhere and each one has one end attached to the contactor. Mark which wire goes where and remove these. This will put those sensors out of the loop. If only one sensor then both wires will go the contactor, one on each side. Turn unit back on and see it the compressor starts up. If so then you need a tech to re-charge or diagnose problem. If not, make sure temp inside is set low enough for compressor to turn on. Still noting, then it most likley your thermostat. Need volt meter to check this and better to not mess with the wires as this can really mess things up. At some point you will most likely need to call a tech anyway as you need to be licensed to buy freon and will be required if low charge is indicated.

Posted on Apr 23, 2013

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Posted on Jan 02, 2017

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  • 3 Answers

SOURCE: The fan in the outdoor unit does not work while the AC is on.

these motors are famous for the inyernal fuse blowing in the fan motor. check continuity between the red and blac wires. if there is non the fuse is gone. These motors are fairly easy to take apart and change the fuse . hope this helps

Posted on Sep 01, 2008

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SOURCE: Carrier AC Compressor Fan will not turn on.

Bad contactor - replace

Posted on May 07, 2009

  • 1 Answer

SOURCE: Compressor will not come on. Fan runs great.

I fixed it. I had a dirty connection on the starter relay for the compressor. Thanks again for the help.

Posted on May 18, 2009

  • 534 Answers

SOURCE: Contactor not engaging to start condenser unit

I would replace the contactor if you are getting 24 volts to the contactor and it isn't engaging therefore the magneto on the contactor is out and the contactor will need replacement. If you don't have 24 volts at the contactor then the transformer that sends the 24 volts is bad and will need replacing

Dave

Posted on Mar 11, 2010

roniecon
  • 6927 Answers

SOURCE: My contactor switch will not remain engaged. I

Something,is drawing too many amps,most likely the compressor.

Posted on Jul 08, 2010

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All of the sudden tonight it was getting hot went to adjust thermostat and it was blank. No air and no fan. Bought new thermostat (above). checked circuit breakers. thermostat shows it is on but wont kick...


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Is the indoor unit operating? If no turn the fan from auto to on at thermostat. If the fan comes on, that is a sign that you have 24volts
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If you are skilled or know somebody that is with electrical, turn the power back on to the outdoor unit take a non conductive object and
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