HAKO 7580.02, Service Booklet

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Foil 55
9. Drive Controller
The light-emitting diodes (LED) are directly located on the electronics
LED indication Malfunction Remark
OFF Drive controller Voltage supply interrupted
without function Check fuses and wiring
ON Drive controller is Drive controller function
operable okay
2 signals Wrong start sequence Check accelerator and direction
switch as well as cabling
3 signals Output transistors Check wiring to drive motor;
do not connect or check carbon brushes;
no connection to if okay but error still present
drive motor replace drive controller
9.1 SEVCON Controller (Diagnostic LED)