As the cooler weather settles around El Paso, your furnace plays a crucial role in keeping your home warm and comfortable. However, if it keeps turning off unexpectedly, it can be frustrating and inconvenient. There are several potential causes for this issue, some of which you can address yourself, while others require professional assistance.
1. Clogged Air Filter
One of the most common reasons your furnace may keep turning off is because your air filter has clogged. HVAC filters prevent dust and debris from entering your furnace and damaging its internal components. It is also essential for indoor air quality because it captures airborne contaminants that would otherwise recirculate through your living spaces. However, when a filter gets too dirty, it restricts airflow through your heater, which causes a variety of issues, including shutdowns.
Standard fiberglass filters should be changed every 30 to 90 days, while pleated filters usually have a longer lifespan. Many homeowners inspect their furnace’s filters monthly to ensure they know when it needs to be changed out.
2. Dirty Flame Sensor
If you have an older furnace, there is a flame sensor inside your furnace’s burn chamber. It ensures the pilot light is lit before allowing fuel to flow into the heater. If the sensor doesn’t detect a flame, it will shut off the fuel to prevent dangerous gas buildup. Over time, the flame sensor can accumulate dirt and debris. This grime causes the sensor to trigger a shutdown even if the pilot light is operating correctly. A furnace repair professional can get your furnace working again by cleaning or replacing the flame sensor.
3. Faulty Electronic Ignition System
Modern furnaces rely on electronic ignition systems instead of traditional pilot lights to ignite the gas in their burn chambers. These systems are generally more efficient and safer, but they can experience issues that may cause your furnace to shut down unexpectedly.
There are two main types of electronic ignition: intermittent pilot and hot surface ignition. Both rely on sensors and electronic components to detect when gas is present and ensure proper ignition. If these components develop an issue, your system may fail to start.
For instance, a hot surface ignitor can become coated with soot, preventing it from heating up enough to ignite the gas. Alternatively, problems with the ignition control board can cause the system to malfunction by sending incorrect signals to the ignitor or gas valve. Routine heating system maintenance is essential for keeping these parts in good working order.
4. Faulty High Limit Switch
The high-limit switch is a critical safety feature in modern furnaces. It monitors the temperature inside the furnace to prevent overheating, which could lead to fire hazards or damage to the system.
The high-limit switch triggers a shutdown if your heating system gets too hot. However, this switch can sometimes malfunction. A faulty high-limit switch may incorrectly register that the furnace is overheating, causing it to short cycle. In many cases, this causes a furnace to turn off before it can heat your home to your desired temperature. You will need to contact a professional to inspect and replace the faulty switch.
5. Closed or Blocked Vents
All the supply and return vents in your home must remain open and unobstructed for your furnace to operate efficiently. Closed or blocked vents hinder airflow, forcing the system to work harder to circulate warmth throughout your living spaces. A restriction in airflow can cause heat to build up inside the furnace, increasing the risk of overheating and triggering safety shutdowns. You should keep all your vents fully open and maintain at least a 6-inch clearance around each to allow proper air circulation. Regularly check for obstructions like furniture, rugs, or curtains that may block airflow.
Contact Your Local Professionals
At E.P. Omega Air Conditioning LLC, we have served the residents of El Paso, TX, and the surrounding areas for over 15 years. We install, maintain, and repair heating systems and cooling equipment. We can also help with all your indoor air quality and ductwork needs. Contact us today to schedule an appointment for furnace repair or any other HVAC issues.
