You had the wrong model selected, should have been MPB040EN.
POSSIBLE CAUSES AND TEST PROCEDURES Cable connection to m*otor field is loose or damaged. Verify connection of field wires to motor and controller. Motor field winding* is shorted to chassis. Motor field should be less than 2 ohms. Verify battery conditi*on, charge, and connections. Failure of current sens*or in controller or failure of field current driver in controller. Replace controller. Check for resistanc*e between A1 and A2 to case, it should have approximately 0.5 mega ohms. Check for F1 and F2 n*ot to be open, and to have clean and tight connections. The resistance across F1 and F2 should be between 0.5 and 2.5 ohms
Post the serial number so we can identify the controller type.