That "flame sensor" in the pilot flame only shuts the gas off to the pilot if the pilot goes out. It is called a thermocouple and if you are not having trouble with the pilot going out it is OK.
You do have a real "flame sensor" that lives somewhere in the burner flame that shuts the gas off in case the burner does not light for some reason. It is a valuable safety feature but they do get dirty and when they fail they often exhibit the symptom you describe.
You can easily clean it with a dollar bill or, as my favorite HVAC guy does, you can use a $100 dollar bill to show off a bit. Of course no harm comes to the bill. Just wrap the bill around the sensor and gently rub. DO NOT USE SANDPAPER! The coating on the sensor is thin and sensitive but can be cleaned gently.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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