[Solved] With which script can I calculate a certain height, to decrease the character's life?

So, I was creating a script that could calculate a certain height and, if the character exceeds that limit, life could decrease or remove, so, in my brilliant mind, well not totally I did it like:

local player = game.Players.LocalPlayer

local char = player.Character

while wait() do

    if char.HumanoidRootPart.Position.Y < 1000 then

        char.Humanoid.Health = 0

    end

end

I believe that this command is not the right command because, I tested it and it didn't work the way I wanted. So how can I solve this little problem?