Breville Smart Grinder Pro BCG820BSSXL Instructions page 4

If there is a foreign object that is causing the blockage, it may also be that it makes a loud cracking racket inside
the grinder. If that is heard, stop the grinder immediately and proceed with the above steps. When tipping the
grinder over to empty out any beans, it can be tipped completely upside down and very gently shaken to loosen
the object.
The Smart Grinder Pro™ will not start.
There can be several reasons that the Smart Grinder Pro™ will not start even though the START/CANCEL
button has been pressed:

Ensure that the cord for the Smart Grinder Pro™ is securely plugged into the wall outlet.

The Bean Hopper may not be locked into place. If this occurs, the 'LOCK BEAN HOPPER' message will
appear on the LCD screen. Simply remove the bean hopper lid and the bean hopper, clean out the locking
area on the top of the grinder, re-seat the hopper and lock securely into place. The lock will click into
place. Replace the lid and press the START/CANCEL button to commence grinding.

The Smart Grinder Pro™ is equipped with a Thermal Safety Shut Off to prevent over-heating of the motor
due to excessive grinding or overly-heavy loads. When this is engaged, the machine will shut off and
pressing the START/CANCEL button will not turn it on until it's been given a chance to cool. Unplug the
grinder and leave off for about 20 minutes.