Display shows E12; machine may not complete self-test and stops shortly after power-on.

Safety first: Unplug the machine before removing the brew unit or side panels.

• Remove and reinstall brew unit: Take out the brew unit, rinse and dry it, then reinstall making sure it is fully locked in place.
• Check for obstructions: Look inside the brew chamber area for broken plastic pieces, coffee pucks, or foreign objects that could block the drive mechanism.
• Power cycle: Plug the machine back in and allow it to run its self-test. Listen for the brew drive moving to its home position.
• If E12 returns: The position sensor (often a microswitch or Hall sensor) or the drive mechanism may be faulty. Accessing these parts requires disassembly of the side and rear panels; professional service is recommended.