# Electrical Problems
**URL:** https://foil.zone/t/electrical-problems/26408
**Category:** Build, Repair & Mod
**Tags:** vesc
**Created:** [May 16, 2026, 12:34pm UTC](https://foil.zone/t/electrical-problems/26408 "2026-05-16T12:34:44Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@Arch064](https://foil.zone/u/Arch064)
#### Post date: [May 16, 2026, 12:34pm UTC](https://foil.zone/t/electrical-problems/26408/1 "2026-05-16T12:34:44Z")
Dear all,
I’m having some problems with me set up and wondering if anyone can be so kind as to help me
MY SETUP:
- ESC: Flipsky FSESC 75100
- Motor: Flipsky 65121
- Battery: 2x 6S LiPo in series (12S, 44.4V nominal)
- Remote: Flipsky VX3
- Application: Efoil build
THE PROBLEM:
The motor does not spin when the trigger is pulled. No current spike is visible in VESC Tool when throttle is applied, suggesting the ESC is not outputting power to the motor.
WHAT I HAVE TRIED:
- Full FOC motor detection completed successfully
- Motor parameters detected: R=4.4mΩ, L=67µH, Flux Linkage=14.4mWb
- Confirmed Sensor Mode = Sensorless
- Confirmed App to Use = UART
- VX3 remote paired and showing live telemetry (battery and ESC temp visible on remote screen)
- Throttle signal confirmed at 96.9% in VESC Tool when trigger pulled
- Phase wires resoldered
- No fault codes registered (confirmed via terminal faults command)
- foc\_openloop commands accepted by ESC but motor does not respond
- Current does not spike when any motor command is sent
- conf\_store run multiple times but settings do not appear to save properly
MY CONCERN:
The ESC may have suffered damage to the output stage (MOSFETs) during initial testing when the motor was overheating due to a bad phase wire connection. The ESC accepts all commands and connects fine but produces no output to the motor.
Could you please tell me what my best steps going forward are and if there is anything I can do.
if someone is willing to come to Oxford and get on the computer and sort this out will happily pay for their time.
I am based in the UK (Oxford). Please let me know what information or evidence you need from me.
Thank you for your help.
Kind regards
---
### Author:  [@tkfoil](https://foil.zone/u/tkfoil)
#### Post date: [May 16, 2026, 1:56pm UTC](https://foil.zone/t/electrical-problems/26408/2 "2026-05-16T13:56:02Z")
Are you sure the UART is connected correctly?
I am asking because the TX and RX cables on the connectors sometimes need to be switched. I have the VX3 and the 75100 from Makerspace. Makerspace has inverted positions of TX and RX pins compared to Flipsky. I was also wondering why the motor does not spin up.
EDIT: sorry just reading that you are receiving the throttle signal in the VESC. In that case I have no idea. But I used Claude to resolve all my issues with the VESC by sending screenshots from the configs and checking the wires.
---
### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [May 16, 2026, 3:06pm UTC](https://foil.zone/t/electrical-problems/26408/3 "2026-05-16T15:06:15Z")
> [@Arch064](#):
>
> Full FOC motor detection completed successfully
Repeat detection, if it spins there, hardware issue is out.
For VX3 I had to select “current no reverse” or “duty cycle no reverse” option to get it spinning.
---
### Author:  [@DutchFoiler](https://foil.zone/u/DutchFoiler)
#### Post date: [May 16, 2026, 4:41pm UTC](https://foil.zone/t/electrical-problems/26408/4 "2026-05-16T16:41:00Z")
Like Jan said, does the motor spin with the setup? This would rule out a hardware failure pretty much.
---
### Author:  [@Arch064](https://foil.zone/u/Arch064)
#### Post date: [May 16, 2026, 7:30pm UTC](https://foil.zone/t/electrical-problems/26408/5 "2026-05-16T19:30:50Z")
thank you helping me with this I massive appreciate it.
yes the motor does spin when I do Foc setup and when I pull the trigger it doesn’t spin but it does jutter
---
### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [May 16, 2026, 7:47pm UTC](https://foil.zone/t/electrical-problems/26408/6 "2026-05-16T19:47:03Z")
I did set my VX3 to UART and PWM, cannot exactly remember why.
But that worked fine.
Its important to not have reverse or brake option active anywhere.
I think there are some settings on the VX3 menu for that.
Set control mode to Duty cycle no reverse for first tries.
---
### Author:  [@tkfoil](https://foil.zone/u/tkfoil)
#### Post date: [May 16, 2026, 7:50pm UTC](https://foil.zone/t/electrical-problems/26408/7 "2026-05-16T19:50:58Z")
Did you calibrate the triggers in the remote?
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### Author:  [@Arch064](https://foil.zone/u/Arch064)
#### Post date: [May 16, 2026, 8:20pm UTC](https://foil.zone/t/electrical-problems/26408/8 "2026-05-16T20:20:50Z")
have tired all and as any wise man does go straight to AI so me and claud ( mainly claud ) have released the hardware coming up on VESC tools is a 75\_300\_R2 but the ESC I have is the FSESC 75100. and Current never moves from -0.01A including any command. so ESC has failed.
if anyone think is might have been a different reason I’m fully open to ideas and trying to get things to work.
thanks again
---
### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [May 16, 2026, 8:27pm UTC](https://foil.zone/t/electrical-problems/26408/9 "2026-05-16T20:27:57Z")
> [@Arch064](#):
>
> Current never moves from -0.01A including any command
Detection will not work without current.
So either this or your statement above is wrong.
If detection works, set app to none and run “experiment” duty cycle sweep. If working it rules out ESC or motor as problem.
---
### Author:  [@DutchFoiler](https://foil.zone/u/DutchFoiler)
#### Post date: [May 16, 2026, 9:15pm UTC](https://foil.zone/t/electrical-problems/26408/10 "2026-05-16T21:15:25Z")
Hi, please make sure to follow the following video when setting up the vesc
You can lower the currents a bit more, check the Flipsky website for the current requirements for the 65121 and follow Ludwig’s logic.
[ ](https://www.youtube.com/watch?v=QaVPISP8BF4)
---
### Author:  [@Arch064](https://foil.zone/u/Arch064)
#### Post date: [May 17, 2026, 9:32am UTC](https://foil.zone/t/electrical-problems/26408/11 "2026-05-17T09:32:05Z")
it started and it was accepting everything and commands where working but now I’m getting nothing it jitters when I pull the trigger but no signs of it actually spinning. now its not accepting commands
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### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [May 17, 2026, 9:48am UTC](https://foil.zone/t/electrical-problems/26408/12 "2026-05-17T09:48:24Z")
start fresh.
new detection, accept defaults for vesc, run detection - if everything works save.
set app to “no app”. save.
Go to motor settings, experiments, duty sweep, run. See what happens.
This spins up the motor in increasing speeds.
If this works, there is no hardware issue in VESC or motor.
---
### Author:  [@janefoil](https://foil.zone/u/janefoil)
#### Post date: [May 18, 2026, 8:44am UTC](https://foil.zone/t/electrical-problems/26408/13 "2026-05-18T08:44:54Z")
did you try put the remote on m(edium) or H(igh)?
i have VX5 remote and if i put gear in 1 or 2 nothing happens
i must atleast put it on gear 4 or higher to have anny movement in propellor
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### Author:  [@tkfoil](https://foil.zone/u/tkfoil)
#### Post date: [May 18, 2026, 10:12am UTC](https://foil.zone/t/electrical-problems/26408/14 "2026-05-18T10:12:17Z")
Under App Settings → VESC Remote
What value do you have under “Control Type”? It should be “Current No Reverse”.
Under App Settings → General
“Pairing Done” should be set on “true”
I have setup my VESC freshly yesterday and those two settings were on “OFF” and “false”. I had the same symptoms as you.
Maybe you can post screenshots of your settings?
---
### Author:  [@Arch064](https://foil.zone/u/Arch064)
#### Post date: [May 19, 2026, 8:25pm UTC](https://foil.zone/t/electrical-problems/26408/15 "2026-05-19T20:25:05Z")
these are my setting when I do flux linkage test the motor spins nicely.
there was also no difference between current and current no reverse.
Uploading: IMG\_0170.png…
full throttle only pulling 75W.
if you think buying a new one is the best option please let me know and if so which one would be the best to buy.
once again I really appreciate all this help
---
### Author:  [@tkfoil](https://foil.zone/u/tkfoil)
#### Post date: [May 20, 2026, 6:52am UTC](https://foil.zone/t/electrical-problems/26408/17 "2026-05-20T06:52:20Z")
The settings seem to be fine. The only odd values you should change, but will not help you to resolve your problem:
- App Settings → General: Timeout should be at least 1000. I have 500. This is a safety setting and it stops your motor when the controller looses connection.
- Motor Settings → General → Current: Motor Current Max to low, Battery Max Current and Battery Max Regen Current are way to high. Your LiPo might be able to deliver it, but you really do not need it and you probably will never hit that value.
For the 75100 you can set Motor Current Max between 100 and 120A (I have it at 120A with good cooling and it also depends on your motor Kv) and Absolute Maximum Current at 160A. The Battery Max Current you can set between 60A and 90A to be able to reach the motor current (really depends on how much your battery can safely deliver → I do not know your battery, so might have to limit it lower + your needs might be lower → bigger board for example). Battery Current Max Regen is not relevant for us, but it should not be 0 because it could cause other issues. In the setup video he says between 20% and 50% of Battery Current Max. I have mine way lower than 20% (6A) with not problems.
I would really advise you, if not done yet, to watch the video @DutchFoiler posted above on how to setup a vesc.
Could you also send the rest of the settings under Motor Settings → General → Voltage, RPM, Wattage. And Motor Settings → FOC → Filters
---
### Author:  [@Jan12](https://foil.zone/u/Jan12)
#### Post date: [May 20, 2026, 2:03pm UTC](https://foil.zone/t/electrical-problems/26408/18 "2026-05-20T14:03:40Z")
From the screenshots you left out the settings for UART.
Not even sure what VESC remote is, but since you selected UART, that is where your settings are.
> [@Arch064](#):
>
> full throttle only pulling 75W
Bench or in water?
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### Author:  [@DutchFoiler](https://foil.zone/u/DutchFoiler)
#### Post date: [May 20, 2026, 2:11pm UTC](https://foil.zone/t/electrical-problems/26408/19 "2026-05-20T14:11:24Z")
Wait, so the motor responds? 75W above water is normal. Try it in water, it needs resistance.
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### Author:  [@Arch064](https://foil.zone/u/Arch064)
#### Post date: [May 20, 2026, 4:31pm UTC](https://foil.zone/t/electrical-problems/26408/20 "2026-05-20T16:31:37Z")
75W on bench but doesn’t kick in until 100% throttle and then cuts out at 50% and isn’t a smooth start either
---
### Author:  [@Arch064](https://foil.zone/u/Arch064)
#### Post date: [May 20, 2026, 4:51pm UTC](https://foil.zone/t/electrical-problems/26408/21 "2026-05-20T16:51:52Z")
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