AC Wont Turn On - The Most Common Fix

Introduction

This tutorial will guide you through the most common fix for an air conditioning unit that won't turn on. Often, this issue is due to a blown capacitor, especially if you hear the outside unit buzzing but not starting. By following these steps, you can diagnose and potentially fix the problem yourself.

Step 1: Diagnose the Issue

• Check the Inside Fan: Ensure that the inside fan is operational. If it is running but the outside unit is not, this indicates a potential issue with the external components.
• Listen for Buzzing: Pay attention to any buzzing sounds from the outside unit, which may suggest that the capacitor is trying to start the compressor but failing.

Step 2: Locate the Capacitor

• Turn Off Power: Before doing any work, turn off the power to the AC unit at the breaker box to ensure safety.
• Access the Outside Unit: Remove the access panel on the outside unit to locate the capacitor. This is usually found near the compressor.

Step 3: Read the Capacitor Rating

• Identify Specifications: Look for the label on the capacitor. It will have ratings such as "25+5 MFD", indicating both the capacitance and the voltage.
• Note the Values: Write down the specifications, as you'll need to purchase a replacement that matches these ratings.

Step 4: Remove the Old Capacitor

• Disconnect Wires: Take a picture for reference, then carefully disconnect the wires from the capacitor. Note the connections to ensure proper installation of the new capacitor.
• Unscrew the Capacitor: Remove any screws or clips holding the capacitor in place and take it out.

Step 5: Install the New Capacitor

• Position the New Capacitor: Place the new capacitor in the same position as the old one.
• Reconnect Wires: Use the reference picture to reconnect the wires exactly as they were. Ensure connections are secure.

Step 6: Test the AC Unit

• Restore Power: Turn the power back on at the breaker box.
• Monitor Operation: Turn on the AC unit and check if the outside unit starts normally. Listen for buzzing and check if the compressor is running.

Tips and Precautions

• Safety First: Always ensure the power is off before working on electrical components to avoid shocks.
• Common Pitfalls: Double-check all connections to avoid issues. If the unit still doesn’t work after replacing the capacitor, there may be other underlying issues.
• Real-World Application: Regular maintenance and checks can help prevent such issues, extending the life of your AC unit.

Conclusion

By following these steps, you can effectively diagnose and replace a blown capacitor in your air conditioning unit. If the AC still doesn’t function after this repair, consider consulting a professional, as there may be other underlying issues. Regular maintenance and timely repairs can help keep your system running smoothly.