C The external AC voltage is too low
Stop using, let elective to troubleshooting
A Incline motor line or signal line is not
plugged in
Check whether the connection is wrong or
not and reconnect
System protection, human stall can be
restarted
B Running board with heavy
resistance. Need to be oiled
Adjust the transmission parts, or add
lubricating oil
C Internal motor short circuit
A Drive torque is too large
Adjust the torque potentiometer to the
proper position
B Internal motor short circuit
C Transmission parts stuck
Adjust the transmission parts, or add
lubricating oil
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