Quote:
Originally Posted by DMiner
Sounds like the pump is frozen. This will produce a hum as the motor is trying to turn, unsuccessfully, but because the motor is frozen, no water is flowing.
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Agreed, did you try smacking it?
If that doesn't work you will have to disassemble it to see if there is something stuck in it. Some of them have a rebuild kit available . But, they are quite cheap to replace if you do the work yourself.