Dishwasher starts to fill then just hums

If it fills with water properly then stops, and especially if there is a humming noise, it is possible that

- motor start capacitor has failed
- drive belt has slipped or snapped
- belt tensioner spring has broken

Sounds like water-level sensor is ok as it stops filling then 'hums'. I'd (carefully) check the connections to the connections between the level-sensor and the wash motor start relay. Could be motor is bad or something is causing it to become 'jammed'. Before you begin opening the appliance, I'd attempt to vacuum out the water or try putting the control in the last position to cause it to try to pump out the water.

Hey Steve,Sorry it took me so long to answer i was offline and my add is not supposed to displayed when i am off line so sorry about that.
Now then on that dishwasher with the hum and no water circulation it sounds as if the main wash motor is jammed up for some reason it could be that the motor itself is defective or as simple as something such a piece of debris such as broken glass or almost anything caught in the motor causing it to not turn on,by disassembling the wash motor you can see if something is caught in,if nothing is caught in its a (sorry to say) the motor itself thats bad and would need to replaced.The reason the water drains even though it will not circulate is because of the separate drain pump that is working Please reply back after disassembling the pump to check for debris if ya need further assistance.
Thanks for using Fixya.Com,GENE

Sounds like the motor is stuck. If your careful you can unplug the dishwasher or turn the breaker off, take the bottom panel off and reach in with your finger and spin the motor assembly.

I decided to buy a new dishwasher! The motor was making a humming noise after the water filled, and there was a burning smell, so I decided to replace the dishwasher!!

If you hear a hum when it should be washing, the motor has seized. Replace motor. If it fills with water and stops quite, run it through a test using the tech sheet under the bottom panel to access. These dishwasher have had issues with the motor.

turn the motor to see if it moves it sound like the motor

sounds like it could be furring in your water piping. may need a plumber to check it out.

Favorite for bosch is the water inlet modual which monitors the water flow in could be faulty, If incorrect pulses take place the motor wont proceed. Otherwise listen for a hum after water stops filling. If there is a hum, the main wash pump is jambed and has to be sorted out.

the hum is probably the main pump powered up but not turning. the pump is an induction motor and a usual fault is the motor capacitor. try to access it, find the value of the capacitor and replace. it is a cheap part