The float sticks from time to time on these things. Just lift it up and down a couple times and it will fix itslelf. You might want to take it our and clean it as well... I replace mine every year and they still stick sometimes. I put a new one in april and it stuck last week for the first time this season. I worry it will stick on, pump the bildge dry and a) kill the battery and b) burn out the pump.
These floats are constantly wet and it is just a matter of time before some slime or growth gets in there and screws something up. A decent float is about 25 bucks.
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