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I just bought a new compressor for my a/c but the store sold me the wrong capacitor. I need a dual capacitor but don't know how to read microferets to get the correct capacitor. Can you help me?

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Do you still have the original capacitor for the unit. They probably gave you the size you need for the compressor. It should have the microfarads printed on the capacitor. The symbol resembles a strange looking u. Then look at the capacitor that came with the unit and get the microfarad rating for the fan. Now you will have the too readings you need to get a capacitor. The fan motor may also have the size capacitor you need printed on the data plate. Let me know if you need more help.

Posted on Jul 03, 2010

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My Goodman DSZ160361AE doesn't run. When I start it up it will run for about 4 seconds then shut off. I get an error code of 7 yellow blinks which means run circuit or compressor windings


Get rid of the hard start cap. Hard start capacitors should never be used in conjuction with normal compressor operation. Contact your local dealer for goodman and find the correct dual capactor for your machine and install it. Odds are your dual capacitor is either not functioning properly due to over voltage strike or it is the wrong size. On the wiring to your compressor, black is normally common and lead directly back to your main contactor. The red wire is the running lead and again normally goes to the c connection on the dual capacitor which leads back to the other side of the main contactor. The remaining wire on your compressor goes back to the herm connection on your dual capacitor. You may have swapped the wires for your power supply to your capacitor. I did this once and I figured it out about 5 hours later after I performed a wire by wire check against the wiring diagram. If you switch the wire around you turn the start windings into run windings and vice versa. They are not designed to be interchangeble. Just check your wiring against the diagram and the problem should clear up.
Hope this helps.

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1 Answer

Instal capacitor on Rudd 10Ajb24a01


Hi, this is a 2 ton unit from the numbers you have provided. I'm not sure what you are asking about the capacitor?? If you are installing the run capacitor, is it for the compressor/outdoor fan motor? I can't tell you how without looking at the schematics on the unit. Its pretty simple though. If you know its bad, you may have to purchase one online. You have to be a contractor in the hvac field to get one at a wholesale store. If its a dual run capacitor, it will have a c, fan, and herm stamped on top. This is for the compressor and outdoor fan motor. It will say something like this, ( 30mfdx5mfdx370 volts and so on. The 2 brown wires on the condenser fan motor will go one taped off and the other on the fan terminal if you are using a dual cap. If you are using a single 5 mfd or larger on a new motor, both brown wires will go to each side of cap. I will need more details if this is not what you need. Thanks
Shastalaker7
H,V,A.C. contractor
Ps, Send me more information on what you need?

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1 Answer

Uaka 024JAZ condensing unit comes on, fan and compressor start up, fan remains on, compressor shuts off in appx 1 min , pressures appear to be headed to normal op range. I did not see a run cap for this...


This unit uses a dual run capacitor. There is no start capacitor involved.

The dual run capacitor is possible weak, also check all the electrical connections for tight fitting connections with can cause motor/compressor overheating.
To test a capacitor properly you need the proper test meter capable of reading uf readings(within 6% of the stated rating on the capacitor) "C" common to "F" fan and "C" to "Herm" terminal, the higher rating for compressor and the lower for the outdoor fan. [(example= 25/3uf 370v) 25uf=compressor, 3uf=fan motor.]

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1 Answer

I installed a new fan motor condenser in my air unit outside and I bought a new capacitor but it looks different than my old one in that my old one has three points of connection and the new one just two....


Look at the microfarad rating on the old capacitor and the new capacitor. Many are dual capacitors in one housing. The lower rating on your old capacitor is for the outdoor fan motor and the higher is for your compressor. It sounds to me like you have been sold a single capacitor when your unit had a dual capacitor originally.

Aug 03, 2011 | Heating & Cooling

1 Answer

I have an 12QZ22TA model. It's blowing warm air. How do you put in freon?


Only an EPA certified Technician can add refrigerant. There are other possibilities why it is blowing cold air.
1. Thermostat is bad (disconnect the power, remove the thermostat, place a jumper wire on the two terminals) Unit starts to cool bad thermostat.

2. Capacitor is bad (look for oil or swelling) looks like a can with terminals.



You can test with a meter.
Instructions Things You'll Need
  • Standard multimeter
  • A/C compressor capacitor
    • 1 Turn the A/C unit off along, and unplug it from, the wall to prevent any power surge to the unit when handling the internal devices. Locate the capacitor inside the unit. Capacitors will come in varying shapes; some will look like either a round or oval cylinder with two or three power terminals on the top. Air conditioners can have two capacitors -- one for the condenser fan and one for the compressor -- and are called dual-run or dual-rated capacitors.
    • 2 Place the probes on the terminals for a run capacitor with two terminals. If the capacitor is a dual-run capacitor with three probes, connect one probe to the herm terminal and the other to the common terminal. You can check the capacitance of the fan for a dual-run capacitor by connecting the probes to the fan and common terminal.
    • 3 Turn on the multimeter and read the display screen. You will see two readings, one for the condenser fan and the other for the compressor. Readings will be in micro farads and seen as the letters "mfd" or "uf."
    • 4 Replace a capacitor if the reading is below manufacturer standards. You can find the required micro farad for the capacitor either marked on the device or in the air conditioner's installation manual. Refrain from testing any capacitor if it is leaking, has corroded terminals or the capacitor unit bulges. Replace it immediately.



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1 Answer

Ac compressor motor change new capcitor is 2prong old on was 3 how should it be wired


Hook your two brown wires to the new capacitor. Now your black and white wires go to the contactor. Disconnect the wires that go to the fan off the old capacitor. The old capacitor is a dual for the compressor and the fan you still have to leave the wires on the old capacitor for the compressor but the new capacitor is independant now. let me know if this helps.

Jul 23, 2011 | Heating & Cooling

1 Answer

When i turn my central air on the fan not running so do the motor and i don't know why. i have this goodman central air for four year now.


I had the same problem with the fan not running and the compressor hard starsting. It turned ouot to be just needing a new capacitor. I also bought a "hard start" unit to hook to the new capacitor to ease the burden of the starting in case there is low voltage to the unit during high usage times. The very first thing I would check would be the capacitor. Don't fool with this yourself unless you first discharge the capacitor, as this is very dangerous unless discharged first.

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1 Answer

Hello I have a 26 BTU LG split unit AC the capacitor in the compressor unit need to be replaced but I don't know how is the wiring connection the capacitor has three heads remarked as...


Hi, The Capactor that you are talking about is a dual capactor. It works the fan and the hermitic compressor in one. The leg common is power into the capictor, The fan leg goes to the outdoor fan, the herm leg goes to the compressor. Good advice is when you change the capacitor you should also change any other start componants that are also there. I hope this helps.

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1 Answer

Need the wiring diagram for capacitors on a IR model 2475N7.5


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1 Answer

I have a 16yr. old Goodman unit and I want to replace the capacitors, but they are rusted and I can't read the values on them. How can I determine the values of them so that I can buy replacements?


A lot of parts stores can cross reference them, if you have the compressor model number and the motor model number. If you don't have the model numbers, I assuming the capacitors are still good you might call your parts store and they might check them for you, if you take them in, with a capacitor analizer.
Make sure before you disconnect any wires that the disconnect is removed and that there is no voltage or power to the unit, and mark every wire and draw a picture of where it goes, so, when you put the new capacitors in you know how to wire it.
If they give you a dual capacitor ( it has 3 terminals and it's for both, the compressor and fan, in one capacitor) have them show you how to wire it or let me know and I can help you.

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