Question about Carrier 38CKC030 Air Conditioner

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Carrier AC Compressor Fan will not turn on. Contactor will not engage. I have 24 Volts on both Blue and Brown on coil contacts? But if I push in the contactor switch it engages and comes on.

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  • rottweilerjo May 13, 2009

    Did. I bought a new one and same thing.

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Bad contactor - replace

Posted on May 07, 2009

  • HANK MCNEIL May 13, 2009

    If you have 24v at the coil and the contacts are not closing you have a bad contactor. If the new one did the same it is bad too.

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1 Answer

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Here is what to do . Pull out or turn off Electrical disconnect behind unit . Carefully remove panel covering controls in unit . Note most units have a flat panel with a few screws, but some GE units have a welded metal box on top of unit which needs to be removed. After exposing controls. replace or turn on disconnect. Then take a plastic handled screwdriver and push in on center of contactor (boxlike part with a lot of wires hooked ) If the compressor now comes on release contactor , and check for 24 Volts AC at base of contactor where thermostat (small wires that run on outside of black refrigerant line ) with thermostat on and calling for cool you should measure 24 to 28 volts . If voltage is present replace contactor after disconnecting from power. If no voltage go inside , remove cover from thermostat, and check for 24 volts between red ( R) and yellow (Y ) terminals on thermostat , If voltage is present , replace thermostat , no voltage check voltage in heater / air handler if you have voltage at air handler , replace thermostat wire from heater to thermostat / if no voltage check for blown fuse in heater , this should be either an inline fuse or an automotive type fuse plugged into circuit board (with power to heater disconnected check broken wire or black mark in fuse when held up to light. If fuse good turn on power to heater and check for 230v to one side of transformer, if you get voltage to Primary (incoming side ) of transformer, check output side of transformer for 24 - 28 volts. If transformer shows input but no output replace transformer after turning power off. If you heard a buzzing or grinding noise , when pushing in contactor , but compressor didn't start look at run capacitor (this is round or oval shaped object with wires going to contactor and compressor ) Looking at area where wires plug this should be a flat surface , if it looks domed shaped or bulging out , it is blown and needs replaced , use same mfd rating and 440 Volts to be on safe side. / If there was no noise from compressor when contactor was pushed in , put your hand on top of compressor (black object in center of unit ) If hot , allow to cool for at least three hours with power to unit turned off and retest . If compressor comes on after cooling , check for bad fan motor in outside unit (it may make a squealing or wining noise and stop runing for a while , also check for / clean outdoor coils
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Make sure there is power at the compressor, but first at the contactor (being supplied to contactor ). Power being supplied to contacter (line voltage) ?
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Hello,im assumimg you are referring to the contactor coil on the oudoor unit. First you must verify if the coil is receiving 24 volts from the thermostat at the coil terminals, if not there is a problem with the low voltage circuit, possibly a a open thermostat wire or a fuse blown on the indoor control board. If ther is 24 volts at the contactor coil and it does not engages then the contactor coil must be replaced

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Have you check the outside breaker? If its ok then you got a problem in your electrical system inside the unit probably the contactor is not engaging this is where the 24 volts from the thermostat calls for the 240 volts to run the condenser fan and compressor. Be careful checking this out because of the high voltage.

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1 Answer

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The buzzing sound, along with the fan motor not running, usually indicates low voltage to the contactor and the contactor is not engaging or closing the points and it usually buzzes when this happens.
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1 Answer

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Hi, I would say to check for high voltage at the outdoor unit. You will have 24 volts from transformer on the secondary side of it, and high voltage on the primary side of the unit. @4volts are for all of the controls on the unit, contactor coil, all of the safetys, pressure switches high and low Ect. On a call for cooling, the stat sends power to the contactor coils, 24 volts to energize it and close the contacts and in turn starts the fan and compressor. Make sure you have high voltage at the unit. If not, check the main breaker, or the box mounted at the unit. Most will have 2 fuses in them that are behind a plastic cover. You can ohm them or just replace if your not sure. If you have power. If this is a split system central unit, check at the contactor for high voltage. If you have it, and it will not come on, you have to see if you are getting 24 volts to the contactor coil to pull in. If it does not, the problem is in the indoor unit unless this is a all in one outdoor unit. Please let me no, give me the details please.
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