How To Fix An AC Unit That Is Not Turning ON! TOP 3 REASONS WHY! DIY

Introduction

This tutorial will guide you through the process of diagnosing and fixing an air conditioning unit that is not turning on. We will cover the top three reasons your AC might be malfunctioning and provide step-by-step instructions to troubleshoot and resolve these issues. This guide is especially useful for new homeowners looking to manage their HVAC systems independently.

Step 1: Check the Power Supply

A common reason for an AC unit not turning on is a lack of power. Here’s how to troubleshoot this issue:

• Verify the Thermostat Settings:

  • Ensure the thermostat is set to "cool" mode and the temperature is set lower than the current room temperature.

• Inspect the Circuit Breaker:

  • Locate your home’s electrical panel.
  • Check if the circuit breaker for the AC unit has tripped. If it has, reset it by flipping it off and then back on.

• Examine the Power Switch:

  • Look for a power switch near the outdoor unit and ensure it is in the "on" position.

• Check for Blown Fuses:

  • Inspect any fuses related to the AC unit. Replace any blown fuses with the correct amperage (typically a 30 Amp fuse).

Step 2: Inspect the Capacitor

If the power supply is intact, the next step is to check the capacitor, which helps the motor start. Here’s what to do:

• Turn Off Power:

  • Always disconnect the power source before working on electrical components.

• Locate the Capacitor:

  • Open the access panel on your AC unit to find the capacitor.

• Inspect for Damage:

  • Look for any signs of bulging or leaking. If damaged, it will need to be replaced.

• Replace the Capacitor:

  • If necessary, purchase a universal motor run capacitor like the TURBO 200.
  • Disconnect the old capacitor and connect the new one by matching the wires to their respective terminals.

Step 3: Test the AC Unit

After checking the power supply and capacitor, it’s time to test the unit.

• Reconnect Power:

  • Turn the power back on at the breaker and the unit.

• Monitor the AC Operation:

  • Observe if the unit turns on. Listen for any unusual sounds that might indicate further issues.

• Use a Clamp Meter:

  • If the unit still doesn’t operate, use a MFD HVAC clamp meter to measure the voltage and ensure it’s receiving the proper electrical supply.

Conclusion

Diagnosing and fixing an AC unit that won't turn on can often be done with a few simple checks. Remember to always prioritize safety by disconnecting power before working on any electrical components. If the steps outlined do not resolve the issue, consider consulting a licensed HVAC technician for further assistance. Taking proactive steps in maintaining your AC can enhance its longevity and efficiency.