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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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