A San Angelo Homeowner’s Guide: Why Does the Burner on My Furnace Keep Going Out?
When the colder months hit San Angelo, Texas, a well-functioning furnace becomes a necessity to keep your home warm and comfortable. But what happens when your furnace burner keeps going out? If you're dealing with this frustrating issue, you’re not alone. Many homeowners experience furnace problems, especially as systems age or after periods of inactivity. In this blog, we’ll explore the common reasons why your furnace burner may be malfunctioning.
Dirty Flame Sensor
One of the most frequent causes of a burner going out is a dirty or faulty flame sensor. The flame sensor ensures that the gas is being burned properly, and if it’s dirty, it may not detect the flame correctly. This can cause the burner to shut off as a safety measure. To fix this, a professional HVAC technician can clean or replace the sensor.
Blocked Airflow
In San Angelo, dusty conditions can easily cause air filters to become clogged. When the airflow to your furnace is blocked, it can overheat, causing the burner to shut down. It’s important to regularly check and replace your furnace filters, especially during periods of heavy use. Luckily, this is something any homeowner can do.
How to Change a Furnace Filter:
Turn off the furnace – Before starting, make sure your furnace is turned off for safety.
Locate the filter – Furnace filters are typically found near the blower motor or within the air return duct. Check your furnace manual if you’re unsure.
Remove the old filter – Slide the old filter out carefully. Make a note of the size written on the side of the filter, as you'll need the same size for a replacement.
Inspect the old filter – Hold it up to the light. If you can't see through it or it's covered in dust, it's time to replace it so proceed to step 5. If it’s not dirty you can insert it back in, making sure the arrows on the filter are pointing in the appropriate direction.
Insert the new filter – Make sure the arrows on the filter are pointing in the direction of the airflow (towards the blower). Slide it into place securely.
Turn the furnace back on – Once the new filter is in place, turn the furnace back on and enjoy improved airflow and efficiency.
By keeping your furnace filter clean, you’ll help prevent airflow issues and ensure your furnace operates smoothly.
Thermostat Issues
Sometimes, the issue isn’t with the furnace itself but with the thermostat. If your thermostat is misreading the temperature or malfunctioning, it may cause the furnace to turn off prematurely. You can troubleshoot this by checking the settings, but if the problem persists, it may require a repair or replacement.
Should You DIY or Call a Professional?
Replacing a thermostat can be a relatively simple DIY job if you’re comfortable with basic wiring and have experience working with household systems. Many homeowners can handle swapping out a standard thermostat for a new model, especially if they’re replacing it with the same type.
However, if your system is more complex, or if you’re upgrading to a smart thermostat or another advanced model, it may be best to call in a professional. An HVAC technician can ensure the installation is done correctly, integrate the new thermostat with your furnace, and provide guidance on programming it for optimal energy efficiency.
Types of Thermostat Replacements:
Manual Thermostats – The most basic option, manual thermostats require you to adjust the temperature manually. While inexpensive, they don’t offer energy-saving features like programmable or smart thermostats.
Programmable Thermostats – These allow you to set different temperatures for various times of the day. For example, you can schedule the furnace to turn down while you’re at work and warm up the house before you return. They offer better energy efficiency than manual models.
Smart Thermostats – Smart thermostats, such as Nest or Ecobee, are the most advanced option. They learn your habits and adjust the temperature automatically. Many smart thermostats can be controlled remotely via smartphone apps, making them convenient for homeowners. Additionally, they often integrate with home automation systems, allowing you to control them with voice commands.
Upgrading to a smart thermostat can significantly improve the efficiency of your heating system, reducing energy costs while giving you more control over your home’s comfort. For proper installation, especially for systems that connect to Wi-Fi or home automation platforms, hiring a professional is often the best route.
Pilot Light Problems
Older furnaces often have a standing pilot light that can occasionally go out. This can be caused by drafts, dirty pilot light components, or issues with the thermocouple. A newer furnace may use an electronic ignition system, which can fail for other reasons. If you’re unsure, it’s best to have a technician inspect it.
Gas Line Issues
If there’s a problem with your gas supply, such as low pressure or a leak, the burner may shut off as a safety precaution. Gas issues are particularly serious and require immediate attention from a licensed HVAC professional in San Angelo.
The Importance of Turning Off the Gas Immediately
If you smell gas in your home, it’s crucial to take immediate action. Gas leaks can pose a severe risk of fire or explosion, as natural gas is highly flammable. The first step is to turn off the gas supply to your home. Most homes have a main gas shutoff valve located near the gas meter. Turning off the gas at the source will prevent further leakage and reduce the risk of a dangerous buildup. Only do this if it is safe for you to do so. If the main gas supply shut off is inside the house it may not be safe.
Steps to Take if You Smell Gas:
Turn off the gas supply – Locate the shutoff valve and turn it off immediately. Don’t attempt to operate any electrical switches, appliances, or lights, as these could ignite the gas.
Evacuate your home – Leave the premises and make sure everyone in the household exits safely. Avoid using phones, lighters, cigarettes, and electronics until you’re a safe distance away.
Call for help – Once you're out of the house, contact your gas company or emergency services. They will send a technician to inspect the leak and ensure it's safe to return to your home.
Gas leaks are extremely dangerous, and professional intervention is necessary to address the issue safely. Never attempt to locate or repair a gas leak yourself—leave it to the experts.
Cracked Heat Exchanger
A more serious issue that can cause the burner to go out is a cracked heat exchanger. This part is essential for the safe operation of your furnace, as it keeps carbon monoxide from leaking into your home. If the heat exchanger is cracked, the furnace will shut down to avoid dangerous gas leaks. This situation requires an immediate furnace repair or whole furnace replacement.
Aging Furnace
San Angelo homes often rely on older furnaces, especially in historic areas. If your furnace is more than 15–20 years old, it may simply be nearing the end of its lifespan. Frequent issues like the burner going out can be a sign that it’s time for a replacement furnace.
Conclusion: When to Call a Professional in San Angelo
Furnace problems, especially with the burner, can stem from various causes—some minor and others more serious. It’s always a good idea to have your furnace inspected by a qualified HVAC technician to identify the issue and perform the necessary repairs.
If you’re experiencing issues with your furnace burner going out in San Angelo, Texas, don’t wait for the cold to set in! Call your local HVAC professionals to ensure your furnace is running smoothly all winter long.
