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Electrically it is fine. The main blower is running, but the fan outside is not. I hear a humming, however. Obviously, the house is hot and nothing is frozen up.

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  • 456 Answers

You either need a new capacitor and or a fan. If you
cannot hear the compressor run and it is not tripping
any breakers you may need to install a hard start
capacitor kit

Posted on Jul 04, 2010

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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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The outside unit has power going to it but isn't


maybe it has tripped off on high pressure, as you have have said the fan is not turning so will cause high pressure. now assuming the problem is the fan is not running than check the condition of the condensator /capacitor for the fan motor. if the motors winding is still good replace the capacitor and try it ON.

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Hello i have Carrier Weathermaker 38tkb air conditioner unit. It's about 6 years old and when i got home today, the unit itself wasn't working. Although the blower fan in the furnace inside was blowing,...


The humming noise and dimming of the lights is an indication something in the outdoor unit is locked up or has failed.

Check the capacitor as it may have gone bad. If the capacitor is good, then you either have a failed motor, a failed compressor, or both.


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It is probably a capacitor problem. Check inside the outside unit. you will see a round cylinder with three groups of terminals on top. If the top of it is dome shaped it probably needs to be replaced. You can check it if you have a microfared tester. However if it is poofed out it probably is bad. If this is not the problem you will probably have to replace the fan motor.

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Sorry to hear about your miss-fortune, you are right it is an wiring problem. Can you turn off the blower with the thermostat (cool-off-heat) or what happens when you switch the fan to (auto or on) When you say the outside unit is "rigged" is it mechanically being jammed or electrically? If its mechanically that should be removed (what a crappy thing to do) other wise it will run continuously as you may already know. That is what it sounds like, you should just be able to shut the entire system down by turning off the switch to the furnace. If it is electrically being held closed, he changed some of the wiring around in the attic unit, you better hope he was lazy and jammed a stick in the contactor in the outside unit or else you may need to learn more about HVAC wiring, none the less I would double check the thermostat wires going to the attic furnace there should be nomenclature on the unit or at least somewhat marked. This was probably disturbed when the new blower was installed, by the way that was your initial problem. Good luck and becarful

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When the heat is not on. Go to the T-stat and turn the fan to the on position. With the blower now running is it making the noise? If so you probably either have something in there such as the filter that was mentioned, a piece of paper etc. or one or more of the blades on the blower wheel is vibrating. Don't let the condition persist w/o having it checked out or you may turn a simple fix into a costly one.

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1 Answer

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Is the outside compressor running? Check the fuses in the outside disconnect by the outside condensing unit. Also check the breaker for the A/C in the main power panel.

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