How reliable is the rain sensor on a Fantastic Fan?

Don't TRUST the sensor. I had wet bedding twice . Called the Co. and *****ed. the said because the rain maybe came from an angle it wasn't hitting the sensor or maybe it was defective. They sent a new one. I installed it. I got wet bedding once more and installed a vent cover. Really did not want to do that because the bedroom fan sits at an angle but No more trouble.Fan itself is an excellent product and very quite.