Press the 'STOPA' button repeatedly to cycle through the various timers. Make sure all of them are set to 0.000.
Alternatively, on the last screen of the cycle, you can turn the stop OFF completely.
Then do the same using the 'STOPB' button.
If you know which output your throttle stop is connected to, you only need to cycle through the options for the applicable timer.
https://www.mpsracing.com/instructio.../Lightning.pdf