
ERR1 indicates a speed issue. In this case, the motor speed as reported from the optic sensor differs
from the speed setting.
Analysis: Optic sensor signal issue -- Either the optic sensor signal is not right, or it is read incorrectly, or
the signal is not reaching the display.
Test it for open or faulty+ clean it, and tight vbery well the connector, see the diagram adjust it
Try to run the software calibration for troubleshooting and diagnostic too.
God bless you
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