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What Is a Furnace Flame Sensor and What to Do When It Fails?

Jun 3

furnace repairA furnace flame sensor is a crucial safety component in modern gas furnaces. This small device is responsible for detecting whether or not your furnace's burner flames are present. If they are absent, it will shut off the gas flow to the burners to prevent a potentially hazardous situation. This situation requires furnace repair Overland Park, KS.

If your furnace flame sensor fails, it can cause your furnace to operate erratically or not at all. Here's what you need to know about this critical safety feature and what to do if your furnace flame sensor fails.

What is a Furnace Flame Sensor?

A furnace flame sensor is a small rod that sits in the path of your furnace's burner flames. This device is usually made from heat-resistant material, such as ceramic, containing a small electrical current.

When your furnace is operating normally, this electrical current flow is uninterrupted. However, if the sensor detects that the burner flames are absent, the electrical current flow will be interrupted, and this will cause the furnace to shut off the gas supply to the burners. You should call the experts for immediate inspection and furnace repair Overland Park, KS.

This safety feature is in place to prevent your furnace from operating without flames present, which could lead to a dangerous buildup of gases.

What Causes a Furnace Flame Sensor to Fail?

There are a few different reasons why a furnace flame sensor may fail. Here are some of those:

Debris Buildup

Over time, small pieces of debris can accumulate on the furnace flame sensor, which can eventually interfere with its ability to detect the presence of burner flames. This is usually a fairly easy problem to fix by simply cleaning the sensor.

Corrosion

Corrosion can occur due to moisture or other environmental factors. It can also be caused by chemicals released when the furnace is operating. This type of corrosion can damage the electrical contacts on the furnace flame sensor, which will prevent it from working correctly. Again, this can usually be remedied by cleaning the sensor.

 

If the wiring to the furnace flame sensor is damaged, it can cause the sensor to fail. Wiring can get damaged due to age, rodents, or other factors. This problem will usually require professional furnace repair Overland Park, KS.

What Happens When a Furnace Flame Sensor Fails?

If your furnace's flame sensor fails, it can cause your furnace to operate erratically or not at all. In some cases, the furnace may continue to run even if the burner flames are no longer present. This can be extremely dangerous, as it could lead to a buildup of poisonous gases.

If your furnace is not working at all, it's likely because the furnace flame sensor has detected that the burner flames are absent and has shut off the gas supply to the burners. Schedule your furnace repair Overland Park, KS.

Replacing a Furnace Flame Sensor

If your furnace flame sensor fails, it will need to be replaced. This is a repair that can be done by a professional.

Once you've determined that the furnace flame sensor needs to be replaced, the next step is to find a part. You can purchase these sensors at most hardware stores or online.

Let the Pros Install It

Installing a furnace flame sensor is not a difficult task, but it's always best to let a professional handle it. This ensures that the job is done correctly, and it also helps avoid any potential hazards.

If you need help with replacing your furnace flame sensor, or if you have any other questions about furnace repair Overland Park, KS, be sure to contact the professional at Priced Right Heating & Cooling. They will be able to help you troubleshoot the problem and get your furnace up and running again in no time. Call them at 913-713-5911 today.