The display shows “E4” and the coffee maker shuts down shortly after starting.

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.

Possible Causes

Low line voltage, Faulty internal power supply on the control board, Shorted component on the PCB, Moisture intrusion into the control panel

How to Fix / Troubleshooting

Safety first: Unplug the appliance immediately if you see sparks, smell burning, or see moisture inside the display area.

Check Environment:

Move the coffee maker to a different outlet on a different circuit.
Ensure the unit is not under a cabinet where steam condenses into the control panel.

Dry Out Moisture:

If the panel appears foggy, unplug the appliance and allow it to sit in a dry, warm room for 24 hours.

If E4 remains after drying and trying a different outlet, the control board’s power supply is likely damaged, and the board should be replaced by a professional or the unit replaced.

Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board (Power Supply Section)

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