Edd, What Josh said but try cleaning them first with a small brush. Something like an old tooth brush. The orifice is under the burner cap and should be clean and grease free too. They need direct flame contact and no carbon. They generate millivolts to prove there is a flame. You can get a millivolt tester but they are hardish to find and easier to just replace the flame sensor. It’s really unlikely two will go bad at the same time so maybe check the electrical connection to the valve too if cleaning them doesn’t work. If the air mix isn’t correct or the opening is dirty you will get carbon deposits so the flame should be blue not orange once the burner is hot. Regards, Len Mitchell Crazy Legs Midland On 1989 37+
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