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If this is a HSI (hot surface ignitor) it's a control error if it doesn't stop glowing once the main burner is lit. Keep in mind that part of the igniter is in the burner flame. That part will still glow after the burner is lit because it's hot from the flame. This is normal
You have to replace the control device. Since I don't know what that is I can't be specific without know what type of unt this is. In most cases on warm air furnaces it's the control board.