The sensor is a little stainless steel rod that’s insulated with a ceramic insulator. The flame sensor is situated in the middle of the combustion chamber. Maybe you get a dirty flame sensor.
When the sensor has been taken away from the furnace all you’ll have to do is clean it with your emory cloth. The flame sensor isn’t only an important equipment to place a check on the use of gas in your furnace, but nevertheless, it ought to be properly maintained too. Undoubtedly the most frequent cause of a malfunctioning flame sensor is it has come to be excessively dirty.
After you’ve cleaned the sensor all you need to do is put it back in place. The majority of the time it’s the flame sensor. In most varieties of furnace setups, the flame sensor needs to be located close to the burner assembly. It is not sensing anything. It is one of the most delicate parts of the furnace and has to be handled with care. If cleaning the furnace flame sensor doesn’t address the issue of the furnace not running, you’ll need to speak to a professional HVAC professional to be able to help troubleshoot and repair the situation.