Today’s furnace systems are more mechanically sound and efficient than ever before. Still, because they use volatile elements like fuel and an open flame, they have safety switches in place to shut off the systems if a problem occurs. The heating service experts from Allen Service Co in Pell City, AL, want to ensure you understand how your safety features work, so they’re here with some need-to-know information.

A Guide to Furnace Safety Switches From Heating Service Pros

What Is the Pilot Sensor?

The pilot sensor, also sometimes called the flame sensor, controls the flow of gas coming from the gas valve. It confirms there is a flame when your furnace starts up; otherwise, unused gas would accumulate and fill your home. If the sensor doesn’t detect the flame, it will automatically shut down your unit.  

What Is the Temperature Limit Switch?

In gas and heating oil forced-air furnaces, the limit switch turns the blower fan on and off as needed. If the furnace’s interior begins to get too hot, it can also shut down the burners. When homeowners hear their blower fans running incessantly, it could be a result of a malfunctioning limit switch.

What Is the Rollout Switch?

The rollout switch is an additional safety mechanism, which cuts the power to your furnace if its internal temperature rises above 350 degrees. When it detects overheating, it communicates this issue to the furnace control board to shut off the power. If your rollout switch needs to be reset frequently, it could indicate a leak in your heat exchanger, which can be very dangerous.

If you experience any issues with the above features or another furnace component, Allen Service Co can help. Their team has helped Pell City and surrounding area residents maintain safe and comfortable homes since 1979. To learn more about the heating service options available, visit the website, or call (205) 338-2311 to set up an appointment.