How To Replace A Capacitor On A Trane Ac Unit

5 min read Jun 26, 2024
How To Replace A Capacitor On A Trane Ac Unit

Replacing a Capacitor on a Trane AC Unit: A Step-by-Step Guide


A faulty capacitor can cause your Trane air conditioning unit to malfunction or not work at all. If you suspect that the capacitor is the culprit, replacing it can be a relatively simple and cost-effective solution. In this article, we will walk you through the steps to replace a capacitor on a Trane AC unit.

Important Safety Precautions

Before starting the replacement process, make sure to take the following safety precautions:

  • Turn off the power: Switch off the power to the AC unit at the circuit breaker or fuse box.
  • Disconnect the unit: Disconnect the AC unit from the power source to prevent any accidental start-ups.
  • Wear protective gear: Wear rubber gloves and safety glasses to protect yourself from electrical shock and other hazards.

Tools and Materials Needed

  • A replacement capacitor with the same specifications as the original one
  • A screwdriver or wrench to remove the capacitor cover
  • A multimeter to test the capacitor
  • A capacitor tester (optional)

Step 1: Identify the Capacitor

Locate the capacitor: The capacitor is usually located in the outdoor unit of the AC system, typically in the compressor compartment.

Check the capacitor label: Take note of the capacitor's specifications, including its voltage rating, capacitance value, and tolerance.

Step 2: Disconnect the Capacitor

  • Remove the capacitor cover: Use a screwdriver or wrench to remove the cover or shield that protects the capacitor.
  • Disconnect the wires: Carefully disconnect the wires connected to the capacitor. Take note of the wire colors and their corresponding terminals.

Step 3: Remove the Old Capacitor

  • Release the capacitor clips: Gently pull out the capacitor clips or retaining rings that hold the capacitor in place.
  • Remove the old capacitor: Carefully remove the old capacitor from the unit.

Step 4: Install the New Capacitor

  • Mount the new capacitor: Install the new capacitor in the same position as the old one, making sure it is securely fastened with the clips or retaining rings.
  • Reconnect the wires: Reconnect the wires to the new capacitor, ensuring they are securely attached to the correct terminals.

Step 5: Reassemble and Test

  • Replace the capacitor cover: Put back the capacitor cover or shield.
  • Turn on the power: Switch on the power to the AC unit at the circuit breaker or fuse box.
  • Test the AC unit: Turn on the AC unit and check if it's working properly.


Replacing a capacitor on a Trane AC unit is a relatively straightforward process. However, if you're not comfortable with electrical work or if you're unsure about any part of the process, it's always recommended to consult a professional HVAC technician. Remember to always follow safety precautions when working with electrical systems to avoid injuries or fatalities.