This could be due to a number of things. It is most likely due to a broken impeller, but it could also be a faulty motor or cracked pump housing. View the trouble shooting page for more information.

This is most likely due to a broken impeller, and the impeller assembly will need to be replaced. It could also be due to air locked in the pump housing, which is most likely due to the pump not be fully submersed.

The noise is most likely an indication that the motor has failed. It will need to be replaced, along with the impeller assembly.