Little Giant stopped working; makes hum noise but wont push wate

You need to take it out and see if the impellor is stuck or if the motor is stalled.

This pump works off of a pressure switch. You can remove the cover on the switch located on the side of the pump.You can either buy a switch repair kit, or you can open it up and take a look and see if the diaphragm is sticking. If you remove and clean the parts, you may have some success. Or, just buy the switch repair kit from your local Little Giant dealer. Good luck!

You say it's new? On some pumps they will secure the float switch when shipping. Be sure you followed directions and removed anything that may interfere with the switch.

use a meter to test the float switch

The motor is binding that's the humming noise. Check to see what **** the thing sucked up. Then try to clean it out. I dont know what happened

You might have 2 problems. The GFIC might be wired wrong or the pump wirng might be compromised with moisture. The noise issue? Are you running this unit without submersing it? They will burn out if you do. To get a more accurate running sound, submerse it with a flexible pipe so you can run it in a 5 gal bucket without losing the water.
It's possible a bearing is burned out.
Ron

Nope, not a good thing

sounds like it has something stuck inside of it , try cleaning out with a water hose and blast some water inside of it the best you can.

shutoff float/switch is stuck.. replace the pump.

I found that little giant pump are oiled filled and if it gets hot it frys itself... As for submersible pumps Magnetic drive Beckett Pumps are nice. My Beckett pump has been going for 4 years now it pumps 4800ghp. the cost $269 last I looked.