A Guide to Furnace Flame Sensors

The furnace flame sensor, also known as a heat sensor, is an integral component in your furnace. It’s a safety feature designed to prevent carbon monoxide from escaping into your home. As such, it’s important to take proper care of it to ensure it remains in good working condition. To learn more, All Seasons, Inc., one of the leading electric panel companies in the state, explains every essential thing you need to know about the furnace flame sensor.  

The Importance of the Furnace Flame Sensor

Flame sensors can be used in your residential furnace or on a large industrial boiler. They indicate the presence of a flame and are part of the safety circuit. If the flames go out and the furnace or boiler continues to feed the unit fuel, this may lead to carbon monoxide poisoning or even a deadly explosion. 

The furnace flame sensor prevents such dangerous occurrences. It creates a small electrical current to detect whether or not a flame is present. If there is no flame, the sensor will shut off the entire system to prevent a gas leak.

Signs of Furnace Flame Sensor Issues

A gas leak can be tricky. Since gas is invisible and odorless, it’s often difficult to know you’re facing a problem until it’s too late. If the flame sensor suddenly stops functioning, this can put you and your family at risk. For this reason, furnace companies advise you to watch out for these signs of flame sensor failure:

• The furnace turns on but shuts off after a few seconds
• Cracks are visible on the porcelain covering the flame sensor
• There’s soot or corrosion buildup on the flame sensor

However, it’s best not to jump to conclusions and immediately buy a replacement. In some cases, carbon buildup is to blame when your flame sensor goes bad. Thus, make sure to clean your furnace flame sensor regularly. In other instances, a failing furnace may point to issues with your electrical system. 

Cleaning Your Furnace Flame Sensor

To clean your furnace flame sensor, be sure to follow these steps:

• First, you need to cut the power. Before working on your furnace, your unit should be completely turned off to ensure your safety. It’s also important to shut off the electric power to the furnace at the breaker box.
• Next, you’ll remove the flame sensor using a screwdriver. You can find the flame sensor at the back of the unit. Loosen the screws and pull them down from the bracket.
• Then, gently clean the sensor with emery paper or light-grit sandpaper. Remember not to scrub too hard since you may scratch and damage the sensor. Wipe away any dust with a lint-free cloth when you’re finished.
• Finally, you can put the flame sensor back in the furnace and tighten the screws. Don’t forget to turn on the furnace to inspect your work.

If you’re looking for a professional heating and air conditioning company, get in touch with All Seasons, Inc. Call us today at (253) 879-9144 or fill out our contact form to set up an appointment. We proudly serve homeowners in Puyallup, Tacoma, and surrounding areas in WA.