Have you tried positioning the electrode closer to where flame is? That also senses flame to keep gas valve open, and if not sensing flame, with cause it to shut down. Clean it with a small brass brush, or similar, and make sure it's getting good flame from burner directed at it. Let me know if that helps. Do you by chance have a multimeter, or 12 volt test light for troubleshooting ?
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Have you tried positioning the electrode closer to where flame is? That also senses flame to keep gas valve open, and if not sensing flame, with cause it to shut down. Clean it with a small brass brush, or similar, and make sure it's getting good flame from burner directed at it. Let me know if that helps. Do you by chance have a multimeter, or 12 volt test light for troubleshooting ?