E9
Tristar Internal Power Supply / Voltage Error

Display shows E9 and the unit powers off unexpectedly during brewing.

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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

Faulty low-voltage power supply on main PCB, Loose mains cord connection, Overloaded internal fuse, Shorted component on control board

How to Fix / Troubleshooting

Safety first: Unplug the coffee maker before any inspection. Do not operate a unit that repeatedly shuts off unexpectedly.

  • Check outlet: Test the wall outlet with another appliance to ensure stable power. Avoid using long extension cords or power strips.
  • Inspect power cord: Examine the Tristar power cord for cuts, kinks, or burn marks. Replace the cord if damaged.
  • Reset and test: Leave the unit unplugged for 15 minutes, then plug directly into a wall outlet and test again.
  • Internal inspection (advanced): Remove the bottom cover and inspect the main control PCB for burnt spots, bulging capacitors, or a blown internal fuse. Replace the fuse only with the same rating and investigate the cause of failure.

Warning: Board-level repairs involve mains voltage and should be performed only by qualified technicians. If you see visible board damage, replace the entire PCB.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control PCB / Power Supply Board
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