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My a/c unit will not turn on. It is fine at the thermostat and the blower fan turns on but the a/c unit outside will not turn on.

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First check the disconnect/circuit breaker that should be located close to the outside unit. Next remove the cover where the power goes into the outside unit so that you can see the contactor. Do a visual check of the contactor and contacts. Set the thermostat to make the A/C come, then look at the contactor to see if the contacts have closed. Use a voltmeter to check for power on the load side of the contactor. If the contacts didn't close, remove the thermostat face and install a jumper between R and Y terminals and see if it pulls in then. If it does then, the problem is your thermostat. If the contacts close and you have power check the capacitor next. If it looks swollen, it is bad - replace it, otherwise you can check it with a multimeter with the capacitor check function. Try these simple checks and let me know what you find if this doesn't fix it so I can give you some more things to look at.

Posted on Sep 13, 2010

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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

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Hello my name is Heath it will be my pleasure to assist you. First thing to do is turn the unit off and check the filter then if the filter is okay check to see if the blower comes on when you put the fan switch on the thermostat from auto to on. If the blower isn't coming on then there could be a problem with the blower motor. If the motor is running then turn the system to cool and turn the setting down to where the air should be on. Then check the outside unit and be sure the outside unit is running if the outside unit is not running go to the house panel box and check the breaker to see if any of them are tripped or off. If there off turn them on and check the outside unit again. If all is running and you get no air flow through the vents then the coil could be frozen. If the unit is frozen turn the thermostat to off and leave the indoor blower on by leaving the fan switch in the on position for a couple hours till it thaws. If the unit froze up then there could be a problem with the a/c system most likely low on refrigerant as a result of a leak. I would have it leak tested and repaired if this is the case.

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