Tristar
Tristar Coffee Makers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Display shows E1 and the coffee maker does not start brewing.
Water Reservoir Level Sensor Fault
E10
Display shows E10 and the descaling program cannot be started or completed.
Descale Program / Flow Sensor Fault
E2
Display shows E2 and brewing stops shortly after starting.
Thermistor / Temperature Sensor Error
E3
Display shows E3 and the coffee maker will not heat water.
Heating Element / Thermal Fuse Fault
E4
Display shows E4 and brewing stops; sometimes accompanied by water leaking inside the machine.
Pump / Flow Meter Error
E5
Display shows E5 and the machine shuts down shortly after starting, often with steam but little coffee.
Overheat / Dry-Boil Protection Activated
E6
Display shows E6 and the machine will not respond to button presses.
Keypad / Touch Panel Communication Error
E7
Display shows E7 and the coffee maker stops mid-cycle with grounds remaining dry in the filter.
Brew Head / Valve Position Error
E8
Display shows E8 and the machine makes a loud buzzing noise but no coffee is dispensed.
Air Lock / Intake Blockage Detected
E9
Display shows E9 and the unit powers off unexpectedly during brewing.
Internal Power Supply / Voltage Error
Symptom
Buttons are unresponsive or require very hard pressing.
Keypad Wear / Contamination
Symptom
Carafe does not sit properly on the warming plate; drip-stop does not open fully.
Carafe / Drip-Stop Misalignment
Symptom
Coffee maker does not power on at all; no lights or display.
No Power / Dead Unit
Symptom
Coffee maker drips coffee slowly or takes much longer than normal to brew a pot.
Restricted Flow / Partial Blockage
Symptom
Coffee maker emits a burning smell during brewing or warming.
Overheating / Electrical or Residue Burn
Symptom
Coffee maker emits unusual buzzing or humming even when not brewing.
Stuck Relay or Transformer Hum
Symptom
Coffee maker lights up and makes noise, but no water flows and no coffee is dispensed.
No Water Flow / Blocked Hydraulic Circuit
Symptom
Coffee maker makes loud banging, rattling, or vibrating noises during operation.
Excessive Vibration / Mechanical Noise
Symptom
Coffee maker overflows the filter basket; coffee and grounds spill over.
Filter Basket Overflow / Drain Restriction
Symptom
Coffee maker powers on but will not start brewing when the start button is pressed.
Start Circuit / User Interface Fault
Symptom
Coffee maker produces a lot of steam but very little liquid coffee.
Steam Leak / Partial Blockage
Symptom
Coffee maker randomly resets the clock or loses programmed settings.
Memory / Backup Power Loss
Symptom
Coffee maker starts brewing by itself or changes settings without input.
Phantom Button Press / Control Panel Short
Symptom
Coffee maker turns off mid-brew and restarts or stays off.
Intermittent Power Loss / Thermal Trip
Symptom
Coffee tastes bitter or burnt.
Over-Extraction / Excessive Brew Temperature or Slow Flow
Symptom
Coffee tastes weak or watery even when using the same amount of coffee.
Under-Extraction / Low Brew Temperature or Fast Flow
Symptom
Display is dim, flickering, or segments are missing.
Display / LED Module Fault
Symptom
Display or indicator light for 'descale' remains on even after descaling.
Descale Indicator Reset Failure
Symptom
Hot plate does not heat or keep coffee warm after brewing.
Warming Plate Heating Failure
Symptom
Hot plate stays on too long or does not turn off automatically.
Warming Plate Control Fault
Symptom
Steam wand (on combo coffee/espresso Tristar models) does not produce steam.
Steam Circuit Failure
Symptom
Steam wand sprays water instead of dry steam, or pressure is very low.
Low Steam Pressure / Wet Steam
Symptom
Water leaks from around the water reservoir area onto the counter.
Reservoir Seal / Valve Leak
Symptom
Water leaks from the bottom of the coffee maker during or after brewing.
Internal Leak / Hose or Seal Failure
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Display shows E1 and the coffee maker does not start brewing.
|
Water Reservoir Level Sensor Fault | View Details |
| E10 |
Display shows E10 and the descaling program cannot be started or completed.
|
Descale Program / Flow Sensor Fault | View Details |
| E2 |
Display shows E2 and brewing stops shortly after starting.
|
Thermistor / Temperature Sensor Error | View Details |
| E3 |
Display shows E3 and the coffee maker will not heat water.
|
Heating Element / Thermal Fuse Fault | View Details |
| E4 |
Display shows E4 and brewing stops; sometimes accompanied by water leaking inside the machine.
|
Pump / Flow Meter Error | View Details |
| E5 |
Display shows E5 and the machine shuts down shortly after starting, often with steam but little coffee.
|
Overheat / Dry-Boil Protection Activated | View Details |
| E6 |
Display shows E6 and the machine will not respond to button presses.
|
Keypad / Touch Panel Communication Error | View Details |
| E7 |
Display shows E7 and the coffee maker stops mid-cycle with grounds remaining dry in the filter.
|
Brew Head / Valve Position Error | View Details |
| E8 |
Display shows E8 and the machine makes a loud buzzing noise but no coffee is dispensed.
|
Air Lock / Intake Blockage Detected | View Details |
| E9 |
Display shows E9 and the unit powers off unexpectedly during brewing.
|
Internal Power Supply / Voltage Error | View Details |
| – |
Buttons are unresponsive or require very hard pressing.
|
Keypad Wear / Contamination | View Details |
| – |
Carafe does not sit properly on the warming plate; drip-stop does not open fully.
|
Carafe / Drip-Stop Misalignment | View Details |
| – |
Coffee maker does not power on at all; no lights or display.
|
No Power / Dead Unit | View Details |
| – |
Coffee maker drips coffee slowly or takes much longer than normal to brew a pot.
|
Restricted Flow / Partial Blockage | View Details |
| – |
Coffee maker emits a burning smell during brewing or warming.
|
Overheating / Electrical or Residue Burn | View Details |
| – |
Coffee maker emits unusual buzzing or humming even when not brewing.
|
Stuck Relay or Transformer Hum | View Details |
| – |
Coffee maker lights up and makes noise, but no water flows and no coffee is dispensed.
|
No Water Flow / Blocked Hydraulic Circuit | View Details |
| – |
Coffee maker makes loud banging, rattling, or vibrating noises during operation.
|
Excessive Vibration / Mechanical Noise | View Details |
| – |
Coffee maker overflows the filter basket; coffee and grounds spill over.
|
Filter Basket Overflow / Drain Restriction | View Details |
| – |
Coffee maker powers on but will not start brewing when the start button is pressed.
|
Start Circuit / User Interface Fault | View Details |
| – |
Coffee maker produces a lot of steam but very little liquid coffee.
|
Steam Leak / Partial Blockage | View Details |
| – |
Coffee maker randomly resets the clock or loses programmed settings.
|
Memory / Backup Power Loss | View Details |
| – |
Coffee maker starts brewing by itself or changes settings without input.
|
Phantom Button Press / Control Panel Short | View Details |
| – |
Coffee maker turns off mid-brew and restarts or stays off.
|
Intermittent Power Loss / Thermal Trip | View Details |
| – |
Coffee tastes bitter or burnt.
|
Over-Extraction / Excessive Brew Temperature or Slow Flow | View Details |
| – |
Coffee tastes weak or watery even when using the same amount of coffee.
|
Under-Extraction / Low Brew Temperature or Fast Flow | View Details |
| – |
Display is dim, flickering, or segments are missing.
|
Display / LED Module Fault | View Details |
| – |
Display or indicator light for 'descale' remains on even after descaling.
|
Descale Indicator Reset Failure | View Details |
| – |
Hot plate does not heat or keep coffee warm after brewing.
|
Warming Plate Heating Failure | View Details |
| – |
Hot plate stays on too long or does not turn off automatically.
|
Warming Plate Control Fault | View Details |
| – |
Steam wand (on combo coffee/espresso Tristar models) does not produce steam.
|
Steam Circuit Failure | View Details |
| – |
Steam wand sprays water instead of dry steam, or pressure is very low.
|
Low Steam Pressure / Wet Steam | View Details |
| – |
Water leaks from around the water reservoir area onto the counter.
|
Reservoir Seal / Valve Leak | View Details |
| – |
Water leaks from the bottom of the coffee maker during or after brewing.
|
Internal Leak / Hose or Seal Failure | View Details |
No matching codes found
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