I have the same problem now with my Enertia+
When I want to put the bike into ride mode by pressing the start button, nothing happens. The contactor does not close and the control diode on the Sevcon motor controller does not light up. I found out that there was a fault somewhere inside the control unit. When I connected it to another working bike, same fault appeared.
Could the DC-DC converter on the VCU board be broken even though it looks fine visually? I also have a problem with the parking lights sometimes not turning on in the park key position, but I don't know if that's related. Also occasionally in the past there was a D4 error and the bike stopped running. After a reboot it worked again.