Tristar
Under-Extraction / Low Brew Temperature or Fast Flow
Coffee tastes weak or watery even when using the same amount of coffee.
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
Thermostat not reaching proper brew temperature, Scale affecting temperature sensor, Incorrect grind size or filter type, Bypass valve stuck open (on some models)
How to Fix / Troubleshooting
Safety first: Unplug before internal checks.
- Adjust coffee preparation: Use a slightly finer grind (but not espresso fine) and ensure the correct filter size for your Tristar model.
- Descale: Run a descaling cycle to restore proper heat transfer and temperature sensing.
- Preheat: Run a short brew cycle with just water to preheat the system before brewing coffee.
- Internal check (advanced): Inspect the thermostat and thermistor on the thermoblock for secure mounting. A loose sensor can misread temperature.
Note: If coffee remains consistently weak despite proper preparation and descaling, the thermostat or control board may not be heating to the correct temperature.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Brew Thermostat / Thermoblock
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements