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Capacitor failures are a major problem that I see every summer and winter in our 20 year old HVAC business! 

Symptoms: If you have a bad capacitor your outdoor condensing unit's fan will not run, the compressor may not run, or both the compressor and the fan may not run. If you have a capacitor problem your indoor blower motor may not run.  Please read below for more troubleshooting. Thanks!

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We sell a large variety of run capacitors for many different name brand air conditioning & heating systems. Below we have a list of capacitors we sell with an opportunity for you to purchase.

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Yes, capacitor problems are probably the second most common problem that I see every summer in our 16 year HVAC business. I have heard about lots of price gouging with this simple problem. One person from Florida called, and told me a company charged him over $250.00 to replace a capacitor. The service techs were not at his home over 10 minutes. That is ridiculous! I do not see how the people who own that company can sleep at night! 

What to look for when a capacitor is bad:  The Air conditioner outdoor unit will not come on. Either the outdoor fan does not run, the compressor does not run, or both the fan and the compressor do not run. You checked and reset your breaker and the outdoor unit still does not come on. You can here a little humming sound inside the unit which is the low voltage contactor humming. You pull the disconnect and disconnect the power to your outdoor air conditioning unit. Please make sure your electrical power is off before working on any air conditioning equipment. You take the door or cover off your outdoor unit's control box and find a bad, swollen run capacitor. EPA stopped allowing manufacturers to produce capacitors with cancer causing PCB's. Since they stopped allowing the use of PCB's the capacitors now have a shelf life. Many times I see capacitor problems that will not allow the compressor or the fan to come on. Many times you can clearly see that the capacitor is bad because it is swollen or even blown apart with capacitor oil everywhere! Sometime you need a special meter to test the microfarad (MFD) or UF rating. "MFD" and "UF" mean the same thing, "Microfarad".  Many times you will see an "UF" rating on the capacitor instead of "MFD." Yes, these two abbreviations mean the same. Most of the time you can tell that a capacitor is bad because it will be swollen up. Please see the picture below for the comparison between a good and bad dual run capacitor. We call them dual because the capacitor helps run both the fan and the compressor. 

*Tip: When identifying the capacitor that you have, you might see the rating stated in "MFD" or "UF." "MFD" and "UF" mean microfarad rating and mean the same.

Bad round dual capacitor on the            Bad oval capacitor on the left. Good oval

                      left. Good round capacitor on the         capacitor on the right.

                      right.

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Please see our capacitor testing meter located near the bottom of this page.

Please see our frequently asked question near the bottom of this page about "How to wire a dual capacitor."

For Your Information: It is OK to substitute a capacitor with a higher voltage rating. For example. It is quiet acceptable to substitute an existing 35/5, 370 volt capacitor with a 35/5, 440 volt capacitor. It is not acceptable to substitute and existing 35/5, 440 volt capacitor with a 35/5, 370 volt.

All Capacitors On This Page Are In Stock & Ready To Ship!

We Test All Capacitors We Sell With A Capacitor Tester to Make Sure They Are Up to Specifications Before Shipping.

Above Dual Round Cap:    Above Dual Oval Cap:   Above Oval Capacitor Terminals:

The Dual Round and Dual Oval Capacitors perform the same, but you might have to change the mounting strap in your system if the mounting bracket does not match up in size. I use pipe strap and self-tapping sheet metal screws to make a bracket. Please be careful not to drill into your condensing unit's coil. 

Below are the Dual Round & Oval Capacitors with an opportunity for you to purchase:

Most of the Capacitors We Sell Are Made by General Electric Co.

Replaces General Electric 97F9803, Bryant, Carrier P291-2553RS

Replaces General Electric 97F9978, Bryant, Carrier P291-2554RS

Replaces General Electric 97F9836, York Part # S1-02423296700

Replaces General Electric 97F9833, Bryant, Carrier P291-3053RS

Below we have listed various types of oval run capacitors. Many of the capacitors listed below are found on indoor blower motors and outdoor condenser fan motors.  Please click on the "Add to Cart" button if you would like to purchase. Thank You!

Replaces General Electric 97F5705, Bryant, Carrier P291-0503

Replaces General Electric 97F9001, Bryant, Carrier P291-0753

Replaces General Electric 97F9002, Bryant, Carrier P291-1003

Replaces General Electric 27L572, Goodman B9456-72

Replaces General Electric 97F9004, Bryant, Carrier P291-1503

Oval Run Capacitors 440 Volt:

Replaces GE 97F9735 & Bryant Carrier P291-3554

Bryant Carrier Thermal Start Kit

P421-4006

I find several of these Thermal Start Assist devices burnt out on Bryant & Carrier air conditioners and heat pumps during the summer months. They are compressor start assist devices so I decided to list them under "Capacitors." Below is a picture with an opportunity for you to purchase. The kit comes with wires, mounting bracket and instructions. The device is about 2" long, and 1 1/2" in diameter.

HC91PD001 Bryant Carrier 3 MFD (uF) Draft Inducer Motor Capacitor

This capacitor was added by customer request. I find this capacitor on many Bryant Carrier Draft Inducers. This small capacitor is only about and 1" X 1" square. The capacitor has a mounting hole in the back that you can not see in this picture.

Frequently Asked Question: I have this question asked many times so I decided to include this on our site.

I forgot how to wire up the dual round capacitor that I purchased from you. How do I go about wiring it up so it doesn't blow the capacitor up again?

Hi!

Thanks for your interest in our web site! You would need to look at the wiring diagram that came with the unit. Usually the wiring diagram is glued to one of the panels on the air conditioner. Hope you can read it. Rule of thumb on wiring the capacitor is: Herm on capacitor goes to the start winding on the compressor, Fan on capacitor goes to brown fan wire that goes to the fan, and Com on the capacitor comes off one leg of the contactor to provide power to the capacitor. There are usually more than one wire connected to the Com terminal. The Com terminal is used so other components of the air conditioner can steal power off the Com connection. Best of luck! I hope you have a nice day! I also hope that you and your family have a Happy, Healthful and Prosperous 2006! God bless you and your family.

This is a great question from one of our potential customers:

Why does a motor or compressor need a capacitor to run properly? What actually does a capacitor do?

Hi!

Thanks for your interest in our web site!  Great question! On alternating current (AC) the current alternates on the voltage from zero to 110 or from zero to 220 volts 60 cycles per second. The run capacitor throws a stored charge in there when the voltage reaches the zero point and keeps the voltage steady instead of all the up and down voltage drops. This makes the motor or compressor run smoothly and more efficient. This is easily seen on an old ocilliscope where you can see the AC current going up and down. 60 cycles per second is pretty durn fast! It is amazing! I hope this answers your question. Hope you have a nice day!

Capacitor Tester

Many times you can visually see that a capacitor is bad, but sometimes you need the help of capacitor tester. That is why we are offering this Supco Digital Capacitor tester for $68.00. This capacitor tester has a digital read out and tests capacitors from .01 to 10,000 MFD. This includes all types of start and run capacitors used in the refrigeration and air conditioning industries.The MFD10 is designed to meet all industrial specifications and service requirements. Below we have pictures with an opportunity for you to purchase:

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