Safety first: Unplug the coffee maker before opening any covers. Do not touch exposed circuitry while plugged in.

Steps:

Power cycle: Unplug the unit for at least 10–15 minutes to fully discharge capacitors, then plug back in and test.
Check for moisture: Inspect around the control panel for signs of moisture ingress (steam, spills). Allow the unit to dry in a warm, dry area for several hours and try again.
Inspect cable connections (advanced): If you are comfortable removing the top or rear cover (with power disconnected), check that any ribbon cables between the display board and main control board are fully seated.
Surge protection: If the error appeared after a power outage or surge, use a surge protector going forward. The board may already be damaged.
Board replacement: Persistent E9 usually indicates a failed control PCB. Replacement requires sourcing the correct Capresso control board and transferring connectors carefully.

Capresso coffee maker shows E9 and will not complete a brew cycle.

Possible Causes