Unfortunately, I didn't use my mount mostly two years... due to our movement to a new house and building my new observatory.
Than, I found that keypad's cable black plastic tube completely fell apart, so I bought a new one. When I tried mount two weeks
ago after so long time, it worked as I already described and also yellow diode raised - motor stall although telescope was precisely balanced in both axis. Have to say, that mount was at home all the time when not used.
I also bought a new Y cable, so I will try a new setup probably tomorrow and let you know.