E12
Rancilio
Mains Voltage / Power Supply Error
Display shows E12; machine may not start or may shut down unexpectedly.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect line voltage, Fluctuating or low mains supply, Failed internal power supply module, Loose power input connections
How to Fix / Troubleshooting
Safety: Always disconnect the machine from mains before opening the power entry area.
- Verify mains voltage: Confirm that the outlet voltage matches the rating on the Rancilio nameplate (e.g., 120 V or 230 V). Do not operate on incorrect voltage.
- Check power cord and plug: Inspect for cuts, burns, or loose prongs. Replace damaged cords immediately.
- Inspect internal connections: Remove the rear or bottom panel to access the power entry module and internal terminals. Tighten any loose screws and check for discoloration or heat damage.
- Power supply board: Many digital Rancilio machines use a low‑voltage power supply board. If the display flickers or E12 appears intermittently, test the low‑voltage outputs. Replace the power supply module if out of spec.
- Use a surge protector: In areas with unstable power, use a quality surge protector or line conditioner to protect the electronics.
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Repair Difficulty
Medium
3/5
Required Part
Power Supply Board
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