Go to tractor supply and buy a heavy “cattle magnet”. (They are used to collect metal objects in cattle’s stomach)
Remove the lower outside grill, the red light on the sensor should be lit.
(Obviously mine isn’t) Lay the magnet along side that edge of the sensor, you’ll hear a click, the light should go out and the propane burner should fire.
Had to do this once in a high humidity local after a frog strangling downpour. Obviously affected by moisture
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