I have a KCM831 2- stop Hydro that is not registering a 2nd floor car call from the COP. I can make a call from the 2nd floor hall or from the cpu with no problem and send it down from the COP, but when you press the 1st or 2nd floor button both will light up. At the bottom floor you can press 2 and again both will light up and open the doors. Everything else works properly besides the 2nd floor car pushbutton.
I've tried LON upload, replacing the ribbon cable, and swapping the pushbuttons in the COP but nothing changes.
Any and all help is greatly appreciated.
Thanks in advance.
This unit worked fine for at least 10 years until suddenly it began doing this.
I failed to mention that initially the button would just light up momentarily when pressed without latching the call. I opened the COP and checked the cable and found if i moved the cable a little none of my buttons would work. I had to pinch the wire for it to work again when suddenly it started acting as if it were addressed as a 1st floor call. I could slightly move the cable and it wouldnt let me use any buttons again (1st flr call, 2nd flr call, door open, door close, etc..). Replaced the ribbon cable and now back to both buttons working as 1.
Thanks again for all the help!