I do not know what is the error code 91, but you must read the instruction manual section troubleshooting. Run the software calibration for diagnose and troubleshooting. If you do not have go to www. iconservice.com or www.fitness.manualsonline.com
However this codes can be relationed with 2 alternatives:
1) elevation motor 2) Main motor.
a) adjust the speed sensor, clean, and tight the wires connector.
b) measure the input voltage motor, if there are the motor need repair.
c) measure the output voltage board, for input voltage motor, if there are NOT, the board is faulty.
SEE The block diagram. God bless you


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