If the motor wheel easy to rotate forwards by hand with ease or very slight resistance or does it rotate with heavy resistance. This is simple test to see if the controller may be at fault, though not 100% conclusive.
With power off one can also use the meter set for 20 ohms DC for mosfet resistance testing, the Black probe on Black thick v- wire and Red probe in turn to the Blue, Green & Yellow phase wires each result should be the same and approx 9 - 10 ohms for the low side.
Next test the high side using the Red v+ against the three colours, the results will likely be different. As long as one doesn't see a 0 reading all is fine.
The aim is to rule out a controller short /failure.
After that one looks at the hub for an issue.