The first thing I would do to protect the pump is to shut off breaker or unplug the pump.I'm sure you have already done this but most pumps will not run for extended periods of time without damage to the pump. I would make sure that the float is not rubbing on pit sides or has anything stoping it from shutting pump off. If you have a seperate mercury switch float then I would unplug it from pump and see if that will shut your pump off.
If you take the mercury switch out of the circuit and the pump continues to run then you need a new pump. Thank you.
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