Flipsky ADC always high

Hello
Actually, everything worked very well and without problems.
but suddenly I could not gas.
The ADC input remains HIGH (3 volts).
The ADC 2 input is working properly.
ADC1 Throttle
ADC2 brake
I use "Current no reverse brake ADC2"
The throttle levers both work on the ADC2.

I need your help?

Lukas