Fault 77 and fault 87

I get these faults because the door doesn’t open at the landing. It was recommended to replace the door operator board. I replaced it and that helped for about a week. Now the problem has returned. Any help would be appreciated.

Make, please.

Sorry. KCM831 traction

I thought I was posting in a KCM831 topic section. Is there a way to edit the title?

77= door open input issue,
Door is opening but input
"open end" or "open end B"
does not change. Door
open limit inactive for
period of time determined
by parameter
OPENINGLIMIT

Check your door open limit switch, could be faulty

87=
Car door contact does not open. Input broken or override wire. After certain time after
door open command
input is checked..
Stuck at level door
opened.
When input is
back in correct
state.
Override the input.

You may be hooking the interlock. If it is always at the same floor, check the hoistway door lock for a little come and go while locked.