Two things .
There must be a difference in the operation of your Magic Fan and my Fantastic Vent . The rain sensor will close my vent cover , but the sensor is then open to the inside air of the coach and will dry , and with the wall control set to " auto "and desired room temperature , the control board will re-open the lid and run the fan.
Six years ago , I installed vent covers , ( I snowbird for 5 1/2 months a year ) ; in that time I've only had it rain hard enough , with wind in the right direction to activate the sensor operation , twice . So maybe a vent cover is the answer .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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