B5
Lavazza General Internal Error / Control Board Fault

Machine displays B5 and shuts down or refuses to start; may indicate an internal fault.

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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

Firmware error, Short circuit detected on internal bus, Failed component on main PCB, Power surge damage

How to Fix / Troubleshooting

Safety first: Unplug the machine before any inspection. Internal electronics carry dangerous voltages.

Step 1 – Power reset

  • Unplug the machine for at least 15 minutes.
  • Plug back in and test. If B5 reappears immediately, proceed cautiously.

Step 2 – Check for obvious damage

  • Remove the cover (if you are experienced and comfortable doing so).
  • Inspect the main control board for burn marks, swollen capacitors, or melted connectors.
  • If you see or smell burning, do not power the machine again.

Step 3 – Surge protection

  • Ensure the machine is connected to a properly grounded outlet, preferably via a surge protector.

When to seek service

  • B5 typically indicates a fault that requires professional diagnosis and likely control board replacement.
  • Do not attempt board-level repairs unless you are qualified in electronics.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board
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