Carrier Furnace Yellow Light Blinking: Troubleshooting Guide

Carrier Cassette Ac Yellow Light Blinking TENTANG AC
Carrier Cassette Ac Yellow Light Blinking TENTANG AC from


If you own a Carrier furnace and notice a yellow light blinking, it could indicate a potential issue with your heating system. Understanding the meaning behind this blinking light can help you troubleshoot the problem and determine whether you need to call a professional HVAC technician or if it’s something you can fix yourself.

What Does the Yellow Light Blinking Mean?

The yellow light blinking on your Carrier furnace is typically an indicator of a system malfunction. It could indicate a range of issues, including but not limited to faulty wiring, a clogged air filter, a malfunctioning thermostat, or a problem with the pressure switch. It’s important to address the problem promptly to avoid further damage to your furnace.

1. Check the Air Filter

One of the first things you should do is check your furnace’s air filter. A dirty or clogged air filter can restrict airflow and cause the yellow light to blink. Replace the filter if it’s dirty or clean it if it’s reusable. Regularly changing or cleaning your air filter is essential for the efficient operation of your heating system.

2. Verify the Thermostat Settings

Ensure that your thermostat is set correctly and functioning properly. Make sure it’s set to the desired temperature and in heating mode. If the thermostat’s batteries are low, replace them. If the issue persists, you may need to recalibrate or replace the thermostat.

3. Check for Faulty Wiring

Inspect the wiring connections on your furnace. Loose, frayed, or damaged wires can cause the yellow light to blink. Turn off the power to your furnace before examining the wiring. If you notice any issues, it’s best to call a professional HVAC technician to handle the repair.

4. Inspect the Pressure Switch

The pressure switch ensures that there’s adequate airflow in your furnace. A malfunctioning pressure switch can cause the yellow light to blink. Inspect the pressure switch for any blockages or damage. If you’re unsure how to do this, it’s recommended to contact a professional for assistance.

When to Call a Professional

If you’ve tried the troubleshooting steps mentioned above and the yellow light continues to blink, it’s time to call a professional HVAC technician. They have the knowledge and expertise to diagnose and fix complex furnace issues. Additionally, attempting to repair advanced problems on your own can lead to further damage or personal injury.


A Carrier furnace with a yellow light blinking indicates a potential issue with your heating system. By following the troubleshooting steps mentioned above, you can determine the cause of the problem and decide whether you can fix it yourself or need the help of a professional. Regular maintenance and timely repairs are crucial to keep your furnace running efficiently and to ensure your home stays warm during the colder months.