ERROR 4
Keurig Internal Communication or Memory Error

Display shows “ERROR 4”; brewer may shut down or refuse to start.

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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

Corrupted firmware, Control board failure, Power surge damage, Loose internal connectors

How to Fix / Troubleshooting

Safety first: Unplug the brewer.

  • Power cycle: Leave unplugged for 10–15 minutes, then plug back in.
  • Check for surge damage: If the error followed a power outage or surge, consider using a surge protector in the future.
  • Factory reset: If available on your model, perform a factory reset via the menu.
  • Persistent ERROR 4: The main control board likely needs replacement by a technician.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board
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