F20
Miele Non-Volatile Memory / Configuration Fault

Robot vacuum shows F20 and refuses to start; may indicate an internal memory or configuration error.

Advertisements

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.

Advertisements

Possible Causes

Corrupted configuration data, Failed flash memory on PCB, Interrupted firmware update, Power loss during configuration write

How to Fix / Troubleshooting

Safety first: Keep the robot on the dock with stable power during any reset or update.

Steps:

  • 1. Power cycle: Turn the robot OFF for 2 minutes, then power it back on.
  • 2. Factory reset: Use the robot’s controls or app to perform a factory reset. Confirm that you understand this will erase maps and custom settings.
  • 3. Firmware reinstall/update: If the app offers a firmware reinstall or update, perform it while the robot remains on the dock.

When to call a technician: If F20 persists after reset and firmware operations, the internal memory chip on the main PCB may be defective. PCB replacement is typically required and should be done by Miele service.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board (PCB)
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements