Eversys Automatic Coffee Machine Error Code E-021: Grinder Motor
E-021 means the grinder motor kept turning without stopping, so the machine cut its power to protect itself. The display carries the error until a technician has dealt with it. Do not keep restarting the machine; close the bean hoppers, keep hands away, and call us.
High: the machine cut its own power over a grinder motor that would not stop, so it stays off until checked.
- Code
- E-021
- Maker
- Eversys
- Equipment
- Super-automatic coffee
- Applies to
- Cameo and Enigma / Shotmaster (E-xxx error messages)
What does Eversys error code E-021 mean?
When a drink is ordered, the control tells the grinder motor to run for a set time and then stop. If the motor keeps turning when it should have stopped, the machine treats it as a runaway and cuts its power on purpose. The display carries E-021 until a technician has dealt with it, and the machine switches off and stays off. The usual cause is on the power board, in the part that switches the grinder motor, rather than in the beans. A switching part that has failed closed holds the motor on whatever the control says. That is why the maker's checks include whether the motor stops when the control tells it to, the power board output that switches it, and the motor wiring and plug. Beans or debris that may have kept the grinder turning is also on the list, for example a jam that was cleared and left the grinder spinning on its own. The message exists because power was cut deliberately, so restarting does not make sense: the machine would just run the grinder again. A grinder that cannot be stopped is a safety matter, with sharp burrs and an exposed motor, so staff should close the hoppers and stay away from the grinder area.
Affected models and control systems
Eversys Cameo, Enigma and Shotmaster machines, as listed in the maker's E-xxx operator error messages.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- E-021 appears and the machine is off
- The machine switched itself off during a drink
- The grinder was heard running on
- The display shows the message after power returns
Possible causes
Listed in Eversys's documentation
- Power board output for the grinder motor stuck on
- Damaged grinder motor wiring or plug
- Motor not stopping when the control commands it
- Beans or debris keeping the grinder turning
Other likely causes — what usually sits behind error code E-021 on this control. A technician confirms which one it is before any part is replaced.
- A power board switching part that has failed closed after thousands of grind cycles
- A motor wire insulation worn through that feeds the motor directly
Safe checks before calling for service
- Do not keep restarting the machine. The message exists because power was cut on purpose.
- Close the bean hoppers and keep hands away from the grinder area.
- Note the time and what drink was being made.
- Call us and tell us E-021 is showing.
- Tell us whether the grinder was heard running after the drink finished.
How a technician diagnoses error code E-021
- Confirm E-021 and ask which drink was being made.
- With power off, inspect the grinder motor wiring and plug.
- Test the power board output for the grinder to see whether it switches off when commanded.
- Check for jammed beans or debris that kept the burrs turning.
- Replace the power board section or wiring that tests bad.
- Run test grinds and confirm the motor stops on command.
- A grinder that will not stop is a hazard, with sharp burrs and an exposed motor.
- The power board switches the motor with mains-side parts that only a technician should test.
- The machine cut its own power on purpose, so restarting repeats the problem.
How error code E-021 differs from similar codes
E-014 is the grinder not connected; E-021 is the grinder that would not stop.
Technical reference
- Document
- Eversys eSupport: Operator error messages for Cameo (E-XXX)
- Models / control
- Cameo and Enigma / Shotmaster (E-xxx error messages)
- Section
- Web page table of E-numbers, Infos messages and Explanations / Remedies (no page numbers)
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related Eversys super-automatic coffee error codes
Why does it stay off?
Power was cut on purpose because the motor would not stop, and a technician has to clear it.
Can beans cause it?
Rarely. The usual cause is the power board part that switches the motor.
Is E-021 the same as E-014?
No. E-014 means the grinder is not connected.
Need help with Eversys error code E-021?
A technician confirms the cause on site and gives you the price in writing before any work starts.