do you know how to test the hall sensor?
Down at the hall sensor, take your test leads to check the 2 following circuits.
White to Blue=10k ohms.
White to Red =10k ohms.
If any of the circuits is open, replace the hall sensor.
With the power switch on but DO NOT PUSH THE START BUTTON!!! All connectors in place.
Grey to White = 10 to 15 vdc
Grey to Blue = 10 vdc pulsing when rotor is turned by hand.
Grey to Red = 10 vdc pulsing when rotor is turned by hand.
Hope this helps.