E15
Rancilio
Internal Communication Bus Error
Machine shows E15 and may not complete startup; often associated with communication between boards.
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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
Loose harness between main board and daughter board, Faulty display or keypad board, Electrical noise or interference, Defective main control board
How to Fix / Troubleshooting
Safety: Disconnect power before accessing internal boards.
- Reseat connectors: Identify all multi‑pin connectors between the main control board, display board, and keypad. Unplug and replug them to ensure good contact.
- Inspect for damage: Look for bent pins, corrosion, or burnt components on any communication‑related boards.
- Reduce interference: Ensure that high‑voltage cables (heater, pump) are routed away from low‑voltage signal cables where possible.
- Board substitution: If available, test with a known‑good display or keypad board. If E15 persists, the main control board is likely defective.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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