E24 error code on a new Bosch Nexxt 500 series washer. What does the code mean and how do we fix it?

SOURCE: my bosch nexxt 500 series washer won't spin

possibly the motor brushes.
take back panel off. disconnect motor. remove bolts holding motor in and take out motor. check condition of brushes

SOURCE: TURN OFF ALARM

Assuming you have allready checked the operators manual, check again on page 19 for "Accoustic Signal".  To deactivate the signal select a program press two of the option buttons and hold until a short signal is emitted.  There you have it. 

SOURCE: Bosch NEXXT 500 SERIES washer Makes knocking sound while spinning

during transport there are fittings installed to prevent damage to the machine. The shaft may have got bent but before panic sets in try to check 1. that there is a gap between the mahine and units
2. that the unit is leveled.

SOURCE: My brand new Bosch is not draining and is showing E:13 error code

Put the washer on cold and run "TWO" cycles. There is too much soap or fabric softner.

SOURCE: Bosch 500 washer won't finish rinse cycle. Flashing error code13

Timed out on drain cycle, basically you either have an outlet blockage or something is trapped in the pump, you can check the pump by opening the bottom right flap on the front panel,manually emptying the w/m and checking the pump filter for coins etc. Also, check the outlet isn't blocked.
Good Luck.