Being a brilliant technician, she deduces that room light is now entering the burner chamber (since the flame shield is removed) and the flame on sensor is detecting the room light and misinterpreting that light as being from the flame. So she takes a business card and completely covers the flame on sensor on the right of the burner chamber. Sure enough, when she tries to ignite the flame now, while again pressing down the flame shield sensor button to overide it, the flame igniter goes on and lights the flame. However, the flame immediately goes out. What's the problem and the solution?

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