Just received a brand new 6004m sensor to replace an 18 month old 1010w sensor with humidity stuck at 99%. After 5 hours, the brand new unit purchased directly from Acurite is doing the same thing; humidity stuck at 99%. Followed the reset steps, and no change. Very disappointed. Perhaps Acurite can send me a new sensor on their dime...I specifically bought a new sensor because of the replaceable temp/humidity sensor, but I feel I shouldn't have to pay for a replacement after less that 12 hours of ownership.