Hello municipality, my hand transmitter from the ZV or FB is no longer possible, I have already changed battery does nothing more. have already read various instructions in the search function and try nothing. The friendly one thinks is probably defective… have then taken my second new battery and so on… nothing Is there a way to get out whether the ZV is defective … would be my first question and after battery change something has to be considered. The friendly says theoretically only needed to change the battery then it would be good again. Here abeer also stands out something from ignition etc. for ideas I am receptively greeting Stumpanski