Breville espresso machine displays LOCK BEAN HOPPER and grinder will not run.

Safety: Unplug before reaching near the grinder.

Steps:

• Remove the bean hopper, check for cracks or broken locking tabs.
• Reinstall the hopper and rotate it fully to the LOCK position until it clicks.
• Check that the hopper presses down on the safety switch or engages the sensor properly.

Advanced:

• Access the hopper microswitch or sensor under the hopper mount.
• Test the switch with a multimeter while pressing it; replace if it does not change state.

Resolution: Replace the bean hopper if the locking tab is broken. Replace the hopper safety switch if it fails testing.