This i3 style printer has been working well for several months.
Today after a crash it does not home the X-axis properly and heads off in opposite direction.
What would cause this behaviour? Any suggestion on how to fix this. Thanks

Found the cause! Limit switch Was disconnected at terminal.
But it was weird because instead of moving towards the limit switch the carriage was moving in opposite direction.
Also it appeared that a crash cauded the problem, but actually the open circuit must have been what caused the crash.