To anyone you may have had this problem. When the car is parked or sitting at the lowest floor. It will not leave on a car call or it will not respond to an upper floor hall call. However it will run on top of car inspection. When it is parked at the highest floor. It will accept a car call and run to the lowest landing and operate properly. It will also accept a bottom floor hall call if it is parked at the top floor. In summary the car will not leave the bottom floor on automatic and respond to car or hall calls. Is it a directional problem? The safety string is good.