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 - The Perfect Restoration - by Chris Pratt. Often, in quiet moments, I have wandered back in my thouhts to the many tractors I have seen over the years and wondered which one inspired me the most. Sure, we have a fond attachment to one brand and model or another, sometimes it was remembering that first time we got to climb up in the drivers seat and command that roaring beast, or maybe because when you see that special model, you can't help but see Dad on it, he's gone, but everytime you see a tractor like his, it's a like part of him i
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