Trane capacitor

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Trane Capacitor

About Us

Welcome to Shortys HVAC Supplies. We are located on the South West side of Indianapolis, IN. Our purpose is to provide Original Equipment Manufacturer parts for the repair and maintenance upkeep of furnaces, air conditioners, ventilation systems and pumps to the general public as well as contractors and commercial building maintenance staff.

We sell brand new OEM parts for most manufacturers such as Carrier, Bryant, Payne, Lennox, Armstrong Aire, Ducane, Trane, American Standard, Heil, Tempstar, Nordyne, Goodman, Rheem, Ruud, York, Coleman, Modine, Reznor, Armstrong Pumps, Bell and Gossett pumps, Weil McLain, Lochinvar, McDonnell Miller, Hoffman Specialties, Manitowoc, Scottsman and we strive to make sure you get the correct part for your application.

Give us a call with the information from your equipment nameplate and we will do our best to help. We can be reached at our local phone number 317-821-8770, Toll Free 877-821-8770 or by fax at 317-821-8772. Our physical address is 7720 S Mooresville Rd in West Newton , IN 46183. Business hours are 8-5 EST M-F. Prior to making repairs please consult your manufacturers instructions and follow all safety precautions. Improper repairs can lead to equipment damage or personal injury or death. If you are unsure of your ability please call a professional company.

Refunds And Returns

Items that are returned must be in original package and in new condition. We are not responsible for return shipping. They must be returned within 30 days of the purchase date. Any returns after 30 days will not be accepted. Refunds takes 4-7 days to be processed and appear back on the card used. A 25% restocking charge will be deducted from the original purchase price. If an item has been installed or altered in any way no refund will be processed. If you receive an item that is damaged please let us know ASAP so we can assist you.
Shipping Rate For Continental US Only. Please contact us for rates to Canada before ordering.


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Shortys HVAC Supplies LLC


7720 S Mooresville RD
West Newton, IN

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Air conditioner capacitors: What they are and why they're such a big deal

Among the jumbled mass of wires inside your air conditioner’s outdoor unit lives one of the most important components of your entire HVAC system: your air conditioner capacitor. 

Your AC capacitor resembles a shiny, cylinder-shaped battery and is responsible for energizing your AC system’s motors to get them running when it’s time to cool things off in your home.

The AC capacitor is one of the most frequently replaced parts of an air conditioner, mainly because it can stop your entire HVAC system from operating if it fails or malfunctions. Should that happen, your air conditioner will have to work harder to circulate cool air in your space, which can eventually wear out your AC unit or result in higher energy bills. 

Keep reading for a breakdown of what you should know about the AC capacitor, including how to spot early signs of trouble and what you can do if yours goes on the fritz.

But first, a quick warning: AC capacitors are dangerous, high-voltage devices. Touching or mishandling one could lead to serious injury or death. So, don’t handle them. Always consult an experienced and licensed HVAC technician if you’re experiencing problems with your air conditioner.

What does an AC capacitor do, exactly?

An AC capacitor provides the initial jolt of electricity your air conditioner’s motors need to run successfully. It stores electricity and sends it to your system’s motors in powerful bursts that get your unit revved up as it starts the cooling cycle. Once your AC is up and running, the capacitor reduces its energy output, but still supplies a steady current of power until the cycle finishes.

AC capacitors are measured in voltage and microfarads. Voltage shows how much electrical current is moving through the capacitor. The more voltage in your capacitor, the faster the electrical current moves throughout it. Microfarads, meanwhile, describe how much electrical current the capacitor can store. Most capacitors range from 5 MFD (microfarads) to 80 MFD.

They may look and function similarly to batteries, but capacitors are not batteries. They’re connected to wiring inside your air conditioning system. That means you can’t simply open your unit’s doors and pop a new capacitor inside if it’s time for a new one. In fact, don’t change your AC capacitor yourself because they’re high-voltage devices that could seriously harm you, even if the power is turned off. We’ll talk more about this later.

Why is a capacitor necessary?

Even though your AC unit is connected to your home’s electrical system, it needs a stronger boost to work effectively. That’s because air conditioners are high-powered machines that require a lot of energy to do what they’re built to do, and your home’s wiring simply doesn’t provide the adequate amount of power to get the job done. The capacitor compensates by kickstarting your system’s motor and helping it cool your home until it takes a momentary break. Once it’s time for another cooling cycle, the capacitor gets back to work.

Capacitors have an important, strenuous job, which is why a failed capacitor is one of the most common reasons for a malfunctioning air conditioner, especially during the summer. A worn-out AC capacitor can cause widespread problems you’d probably rather avoid. 

Start capacitors vs. run capacitors: What’s the difference?

Depending on how your HVAC system is built, there may be two single capacitors or one dual capacitor in your outdoor unit. 

Systems requiring two single capacitors need a start capacitor and run capacitor to function properly. The start capacitor is designed to deliver the energy your AC’s motor requires to start the cooling cycle. That’s it. Once your unit gets that initial jolt, the run capacitor steps in. It stores and then releases the energy needed to keep the motor going and your AC blowing.

If one of these capacitors fails, your technician may decide to replace both parts with a dual capacitor. 

A dual capacitor is like getting a combo pack of candy bars. The device performs the same job as both the start capacitor and run capacitor. It gives your unit that important initial spark and supplies a consistent flow of electricity to keep it running. Dual capacitors offer a lot more convenience. They save space in your HVAC unit and can be easier for HVAC technicians to replace. 

What are the signs of a bad AC capacitor?

There are some telltale signs that let you know when you should hire an HVAC technician to replace your AC capacitor. Some common symptoms of a bad capacitor include: 

  • Your AC takes time to begin a cooling cycle or just won’t start at all
  • Your AC randomly shuts off on its own
  • You can’t feel any cold air in your home while your AC’s running
  • Your AC is emitting a humming noise during operation 
  • You notice smoke or detect a burning smell coming from your unit
  • Your energy bills are unreasonably high

The causes of a bad AC capacitor vary, but can include: debris hitting the capacitor and causing damage; extremely hot temperatures causing the capacitor to overheat; wear and tear over a long period of time; short circuits in the cooling system; power surges; and even lightning strikes.

How do you test an AC capacitor?

Call your local Trane dealer if you need to help discerning whether your AC capacitor isn’t working the way it should and needs to be replaced. These trained professionals use special tools and training to measure the capacitor’s current, voltage and resistance. You should not attempt doing any of this yourself as tinkering with your capacitor may result in serious injury or death.

You should hire an HVAC professional to help you. 

How much does it cost to replace an AC capacitor? 

If you’ve got confirmation from a licensed HVAC professional that your AC capacitor needs replacing, prepare to spend between $120 to $250 for the part and installation, according to a 2021 report from HomeAdvisor. 

The price may vary depending on the HVAC capacitor’s brand, model, voltage and the amount of labor required for installation. (Branded units are typically more expensive, costing up to $400 or more.)

If you’d rather buy the part yourself, you may spend between $9 to $45 on the actual capacitor, although certain brand-name parts and models could cost more. Labor and installation by a licensed HVAC professional may make up the bulk of your costs, and a dealer might not be motivated to install a part you’ve purchased yourself.

Can I replace my AC capacitor myself?

No, you can’t. An experienced HVAC technician should be able to correctly remove your defunct capacitor and replace it with a new one that will get your AC working like it should. 

Find a local Trane dealer in your area who can help you diagnose potential problems with your capacitor and replace it safely. If you’re not sure how your capacitor is operating, schedule regular maintenance with a technician to ensure your equipment is in its best possible condition.

All trademarks referenced are the trademarks of their respective owners. ©2021 Trane. All Rights Reserved.

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The problem that is often encountered in the trane xr11 is the capacitor. This is a problem that is most often complained about by HVAC consumers. So what I want to show you here is how to trace the most common problem with this Trane XR11 before you call a technician guy.

Symptoms of a Bad Trane XR11 Capacitor

Trane xr11 capacitor could be damaged by heavy power surges or simply wear out and lose their capability to save a charge. Whenever a start or function capacitor begins to fail, the following symptoms might occur.

If a capacitor dies totally, the air conditioning equipment motor will try to come on but could make a sound instead of fully starting up. As a capacitor begins to wear out, it could make an audible clicking sound within the cabinet. If you hear this, replace the capacitor promptly, as the engine itself could burn up if the capacitor fails to begin the motor.

If the capacitor mounted on the compressor starts to weaken, it could cause a hard starting condition. You air conditioner will struggles to turn on but then shuts down again almost immediately. Replace the capacitator promptly, because this situation puts a huge pressure on the compressor and other areas of the Trane HVAC system.

How exactly to replace Trane XR11 Capacitor

Replacing a Trane xr11 capacitor part isn’t hard and can be achieved with simple tools. It’s significant to remember that capacitors are created to store electrical current, and so there is a threat of shock if you touch one or make an effort to disconnect it without first discharging any current it really is storing. Keep in mind that operating with electricity is a hazardous and potentially life-terrifying job. If you don’t feel confident or do not fully understand of what to do, you had better call a professional.

Step by Step:

  • Turn OFF the Power
  • Remove the Access Panel
  • Discharge the Capacitor and Label the Wires
  • Install a New Capacitor
  • Turn Power ON and Test

Trane XR11 Capacitor Replacement Cost

To have a technician make a service call to replace a trane xr11 capacitor may cost you $300 to $500 or more. The capacitor part itself costs only $10 to $50. Replacing trane xr11 capacitor by yourself are giving obvious advantages except if your trane xr11 under warranty. And while many air conditioner problems should be handled only by a pro, this is one you really can do yourself.


  • AC parts and capacitors can contain high voltage. Observe all safety precautions. If you do not feel comfortable working with electrical devices, call your local HVAC professional.
  • Do not begin any work until you have turned off the power to the AC unit.
  • Capacitors may still hold a charge even after power has been turned off to the unit. Be sure to follow the steps to discharge the capacitor before handling.

Use a local expert HVAC contractor that will test and measure, not guess and/or only visually inspect, and you will really enjoy your new equipment. This is the best method for considering a planned Trane XR11 capacitor replacement. The right Trane parts can make the difference between a functioning your HVAC system.

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About Mas Broto

Have been in the heating and air conditioning (HVAC) industry for over 20 years. He is person that will grow and thrive to learn more about the HVAC industry throughout his career. Mas Broto is also a blogger, who's dedicated to bringing you the best knowledge to get ahead in the game of life.

Diagnosing and Replacing a Run Capacitor

45/5 MFD 440 Volt Trane Dual Round Capacitor CPT00656

This is a brand new Trane, American Standard, Part number CPT00656 Genteq, 45/5 MFD/uf 440 volt, dual round run capacitor. This run capacitor has the following specifications: 45/5 MFD/uf 440 volts, dual round with an approximate Diameter: 2 1/2″and a Height: 4″. Same Business Day Fast Shipping!

2 in stock

SKU: 45/5mfd440voltdualroundTraneCapCategories: Air Conditioner Parts, AC Parts, Air Conditioner Capacitors, Dual Round Run Capacitors, Run CapacitorsTags: American Standard, Genteq, Trane


Purchase the 45/5 MFD 440 Volt Trane Dual Round Capacitor CPT00656 from Us and Save!

We test all capacitors with a capacitor tester to make sure they are in excellent condition before shipping.

Same Business Day Fast Shipping!

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  • This is a brand new Trane, American Standard air conditioner heat pump capacitor part number CPT00656 Genteq, 45/5 MFD/uf 440 volt, dual round run capacitor.
  • The 45/5 MFD 440 Volt Trane Dual Round Capacitor CPT00656 has the following specifications: 45/5 MFD/uf 440 volts, dual round with an approximate Diameter: 2 1/2″and a Height: 4″.
  • This run capacitor is used in many Trane and American Standard air conditioner and Heat Pump units.
  • We test all capacitors with a capacitor tester to make sure they are in excellent condition before shipping.
  • Please see our capacitor troubleshooting page if you like for more information on capacitor troubleshooting and problems. Please click here to go to our capacitor troubleshooting page.
  • Please send your unit’s model number if you would like for us to look it up to make sure this is the right capacitor for your unit. On Bryant Carrier units we will need your product number on all other units we will need your model number. Our Email address is: [email protected]
  • We would Love to Help You Out and Have Your Business!

cpt00656 455 mfd 440

Additional information

Weight2.0 lbs
Dimensions10 × 6 × 7 in

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