I use the 84100 for my foil assist board.
Works great so far.
But I have one issue.
If the PCB is “hot”, the device does not turn on.
Unfortunately “hot” can be as low as 30° C.
So on a hot day I need to cool the board with an ice pad, just to turn it on.
Once “on” it works just fine.
I have a spare 84100, with the same behavior.
Is this a VESC feature?
Any idea how to change this?
I guess you have the DCDC switch set to “always on”?
There are some issues sometimes in the way that the DCDC is being turned on and off. a voltage is raising on a pin, until it reach a threshold and start the DCDC.
I never had issues on my board with “always on”, but had issues in other projects where we use the “control” option.
There is always the rolling start option, when you turn the motor/prop, the ESC will start. You can check ans set the power option in the app menu of vesc tool.
Yes
It is really a weird implementation.
You think adding a switch could solve the issue?
I will also try the “rolling start” option.
Thanks for your help!
Just wanted to.mention how you are my absolute hero for this tip.
This saved me so much time fiddling around and much of my vacation. 
For some reason the ESC now barely ever turns on, but turning the motor always helps.
It seems you had a great time, I could follow that on insta
Seriously, conditions have been all time good.
Unfortunately we have to leave Finistère for home on Friday.
Ahh seems like I got confused. What is your insta?
My home spot is penfoul, near landunvez
Super nice spot, great if you enjoyed it and had great conditions !!
Yes, spot is great.
Been there a couple of times.
But sort of busy in summer for my taste.
Guess it is excellent in off season.
We usually stay in bay of Duarnenez and Audierne, to avoid the crowds. Unfortunately on my way home now.