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Compressor for air conditioning does not run. no power to the unit, why?

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Try reseting all the related switches and breakers. If this does not work you may need a professional to trace the power loss. Most commonly the compressor first pulls high amperage (due to an internal failure) then the unit will pop a fuse in the disconnect switch. The fuse can easily be replaced but that does not fix the failing compressor. You may want to call a professional in. Good luck:)

Posted on Jul 07, 2008

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Just replaced the capacitor, and reconnected. Turned power on and heard a buzzing sound from the condensor, then the fan turned on. the unit only runs for a few minutes then shuts off


The buzz is the compressor failing to start.The blue or purple wire from the compressor goes to herm on the capacitor. If it's wired right and does not stare the compressor is bad.

Jun 23, 2014 | Bryant 2 Ton 17 Seer Air Conditioning...

2 Answers

My ac central air is blowing air but not cold


Problem #1:Outdoor condensing fan motor has stopped running. This problem could be caused by a bad motor run capacitor. If your motor capacitor is not the problem, then more than likely you need a new motor. Is the fan blade tight, stiff or hard to turn? If the fan blade is hard to turn then you probably need a new motor. Problem #2: Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor or new air conditioning system by using the device known as a "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new air conditioning compressor. Another good device is called a "5-2-1" kit.

Jun 22, 2011 | Goodman CKL36AR36 Air Conditioner

1 Answer

Carrier ac model 38ckc does not cool properly. Outside unit runs but air coming out of the top is cooler than the other units that we have. Just had a service replacing all the filters and coolant checked...


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor by using the device called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new compressor

Jun 20, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

My unit was cooling yesterday and stopped today i put my gage it was 0psig i found a leak on the condenser fix leak and notice the condenser was so hot and not running not even humming.What next iam an...


Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season.

Jun 16, 2011 | Air Conditioners

1 Answer

Running but no cool air blowing


Problem #1:Outdoor condensing fan motor has stopped running. This problem could be caused by a bad motor run capacitor. If your motor capacitor is not the problem, then more than likely you need a new motor. Is the fan blade tight, stiff or hard to turn? If the fan blade is hard to turn then you probably need a new motor. Problem #2: Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor or new air conditioning system by using the device that is called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new air conditioning systems

Jun 15, 2011 | Weather King 10AJA3601AH Air Conditioner

2 Answers

AC is not cooling


Problem #1:Outdoor condensing fan motor has stopped running. This problem could be caused by a bad motor run capacitor. If your motor capacitor is not the problem, then more than likely you need a new motor. Is the fan blade tight, stiff or hard to turn? If the fan blade is hard to turn then you probably need a new motor. Problem #2: Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor or new air conditioning system by using the device that is called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new air conditioning systems.

Jun 11, 2011 | Carrier 38CKC036 Air Conditioner

1 Answer

We have Goodman AC unit...not sure what kind. It has blown VERY cold until the last few days where it would stay a little above where I had it set. Then yesterday I realized it was incredibly hot. My...


Problem #1:Outdoor condensing fan motor has stopped running. This problem could be caused by a bad motor run capacitor.
If your motor capacitor is not the problem, then more than likely you need a new motor. Is the fan blade tight, stiff or hard to turn? If the fan blade is hard to turn then you probably need a new motor. Problem #2: Air conditioner compressor will not start. When power is applied to the air conditioning outdoor unit the fan starts, but you hear a sound like the compressor is trying to start, "UGGG"..., for about 5 to 10 seconds and then all you hear is the outdoor condenser fan run. The compressor is locked and will not start. What is happening is the compressor is trying to start, but because the compressor motor is locked it tries to start for a few seconds and then because of the high amperage being drawn goes off on internal overload. The internal overload protects the compressor windings from overheating and burning up. I see this many times during the start of the air conditioning season. Some compressors just have a hard time starting after sitting all winter long. Some compressors are locked up so bad that I can not start them and must tell my customer that they need a new compressor . Many times I can get the compressor started again without having to buy a new compressor or new air conditioning system by using the device called, "Super-Boost." I keep two or three of these on the truck. They have saved many of my customers from having to buy new air conditioning systems.

Jun 11, 2011 | Air Conditioners

2 Answers

My Rheem Air conditioning unit is not cooling.


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Hi,

Here is a tip about troubleshooting your air conditioner...
There are many things that can cause your air conditioner not to cool…

Air Conditioner Trouble - Review the Possibilities

heatman101

Sep 03, 2010 | Air Conditioners

1 Answer

There is a buzzing noise coming from the air con unit


if everything is running may just be contactor,if compressor is running not fan turn it off call service tech out(Fan motor bad)if fan is running but no compressor turn it off call service

Jan 06, 2010 | Mitsubishi Air Conditioners

1 Answer

My air conditional unit outside ,fans turns on but the unit compressor wont turn on,just stopped working this morning.i turned the thermostat to 72 but only the fan on the outside unit comes on and it is...


Somethings aperson cant fix without a service tech. First it could be wire burnt of capacitor going to compressor. Second it could be bad capacitor. There is a dual capacitor on the ouside unit one side says herm that runs the compressor. Turn power off to check to see if wire is burnt of the herm terminal or the C ternminal. Wire burnt off compressor common terminal.. Could be locked up compressor. Unless you know how to troubleshoot unit. You may have to call service tech. Cost if bad cap. is about 100 to 150. But unit wont run without it. Rus

Jun 21, 2009 | Emerson Quiet Kool 12HT13 Air Conditioner

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