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Thermostat starts but outside unit will not kick on

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Check the disconnect or circuit breaker for the outside unit. Use a voltmeter to make sure you have power on the Line side of the contactor. Set the thermostat to make the air come on check the contactor to make sure it is pulled in. When the contactor is pulled in check the load side of the contactor for power. If the contactor doesn't pull in, go to the thermostat and install a jumper between R and Y to make sure it isn't a thermostat problem. Also make sure you have power to the circuit board. Next you can check the capacitor. If it looks swollen, it's bad. Let me know what you find if this doesn't get it going and I can give you some more suggestions.

Posted on Sep 05, 2010

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1 Answer

Outside unit will only run for a short amount of time with A/C before the fan stops turning and starts humming, squealing/screeching and the top of the outside unit gets hot.


The bearings are bad in the motor and after the fan runs enough it eventually gets hot, making the bearing screech and the fan locks up. Need to replace motor again. See if it has a warranty. The reason it gets hot is because the fan is what removes the heat from the coil and if the fan isn't running there is nothing to cool it off so to speak.

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Why does a CCC2 thermostat continually kick on and off even though the set temperature has been reached?


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I hope this helps. Check to see if its still under warranty.

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1 Answer

Fan wont kick on


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1 Answer

Thermostat not displaying any information. when I try to jump my outside unit and blower wires everything kicks on except the outside unit.


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1 Answer

Everytime my central air unit kicks on my circuit breaker trips. It didn't do this last year or even earlier this year


A circuit breaker 'tripping' everytime the AC unit kicks on 'most always' indicates a direct short (somewhere in the condensing unit), although it is possible that the breaker itself is bad - (but not likely).

Usually the cause of this 'short' will be - either the condenser motor in the condensing unit (outside unit) or the compressor - also in the condensing unit.

If you're mechanically inclined - and "very careful" around electricity - there is a fairly simple way to find out which component is causing the short.

Step 1 - Make sure the condensing unit (outside unit) is completely disconnected (electrically) , i.e. pull the fuses/turn off circuit breaker on outside unit and turn off thermostat.

Step 2 - disconnect the condenser motor (this is the outside fan motor). Note: when you disconnect the wires of the condenser motor "be sure" you mark/write their location, and wrap them in electric tape.

Step 3 - start the AC unit. If the breaker trips again you can pretty much rest assured it's the compressor that is shorted.

To prove it (without a doubt) - go to next step.

Step 4 - "be sure circuit breaker and thermostat is turned off" - and - 'reconnect' the condenser motor - and - then disconnect the compressor wires (mark wires and tape them).

Step 5 - Start AC.

If breaker doesn't trip - you know it's the compressor that is shorted.

If breaker 'does' trip again - then it's possible the breaker itself is bad (not likely) or there is a 'short' in the condensing unit's "wiring" somewhere (not likely).

My guess is that either the condenser motor or compressor is shorted.

Hope this helps.

Good Luck!

Jun 10, 2010 | Heating & Cooling

1 Answer

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1 Answer

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