I have a Nutone LA203WH and it is constantly going off for no reason and I'm getting tired of go to the front door when no one is there. Is there a way to trouble shoot unit? I really like it when it's working right. I'm wondering if the fact that I live a stones throw away for The Long Island Sound (salt water) maybe the cause. The unit is only about 6 months old and shows no sign of corrosion. I don't know what else it could be.... Any suggestions