Tristar
Over-Extraction / Excessive Brew Temperature or Slow Flow
Coffee tastes bitter or burnt.
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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
Thermostat stuck at too high temperature, Severely scaled thermoblock causing localized overheating, Too fine grind or too much coffee, Warming plate overheating coffee after brewing
How to Fix / Troubleshooting
Safety first: Unplug before internal inspection.
- Adjust coffee dose: Use the recommended amount of coffee and a slightly coarser grind.
- Turn off warming plate sooner: If your Tristar model allows, reduce the keep-warm time or turn off the hot plate once brewing is complete.
- Descale: Run a full descaling cycle to normalize water flow and temperature.
- Check thermostat (advanced): Inspect the brew thermostat and warming plate thermostat for signs of damage. A thermostat that does not cycle off may need replacement.
Note: Persistent burnt taste even with fresh coffee and proper settings suggests a thermostat or control issue.
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Repair Difficulty
Medium
3/5
Required Part
Brew Thermostat and Warming Plate Thermostat
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