bought new put in sump will not turn off when it should turns off then back on thought it was bad so took it back to the store were i bought it they gave me another one it worked great for the first day then it started doing the same thing i read that they are touchey when they are new and that is what the store told me when i returned the first one they said it may need to sit in water for a few days to clean it has been in water for 4 days even let set in warm water still no different put it in the tank and still no difference getting very frestred with the thing need help i read how everbody likes these things i am not feeling that way right now