[firestation12]

My last 5er’s sail switch was installed such that the air flow was parallel to the flat surface of the sail switch’s paddle arm. The only way I could see it would work is by a “coanda effect” (sort of like a an airplanes wing deriving lift by airflow across a curved surface. The sail switch would be intermittent at times in creating a closed circuit. I used a pair of needle nose pliers to create a 20 degree twist on the paddle’s arm that gave the air current a direct hit on the switch’s paddle. And that was the last time I had trouble. Or just try a new switch. Might be a better safety thing than what I did. Desperate times often accompany desperate measures.