Machine shows E09 and will not brew; water may leak internally or into the drip tray.

Safety first: Immediately unplug the machine if you see water leaking. Do not operate the appliance with visible leaks due to risk of electric shock.

Step-by-step:

• 1. External inspection: Remove the drip tray and grounds container. Look for unusual amounts of water in the base or behind the front panel.
• 2. Check tank and connections: Ensure the water tank is not cracked and that its outlet valve seals properly. Inspect the tank-to-machine connection for drips.
• 3. Internal inspection (advanced): Remove the side panel and visually inspect all silicone hoses, plastic connectors, and the hydraulic block while briefly powering the machine and starting a rinse cycle. Stop immediately if water sprays near electrical parts.
• 4. Replace obvious seals: If you identify a leaking O-ring on a quick-connect fitting, replace it with a Siemens-compatible high-temperature O-ring.
• 5. Professional repair: Cracked hydraulic blocks or internal leaks near the heater require specialized parts and sealing procedures. Contact Siemens service for a full pressure test and repair.