Remove the burner and carefully remove the view window. Place the burner back in. Set up a fan in front of the heater with a very light air movement. Give it a try. If it works then your flame arrestor is still plugged.
Remove the burner and carefully remove the view window. Place the burner back in. Set up a fan in front of the heater with a very light air movement. Give it a try. If it works then your flame arrestor is still plugged.
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