Part not running Ontouch function?

Hello! I want to make the player heal when touching a part. But the code is not working This is the code:

function onTouched(hit)
	hit.Parent:WaitForChild('Humanoid').Health += 15
end
script.Parent.Touched:connect(onTouched)

The only problem is that it might be in a local script. If it is, change it to a normal script. or if that doesn't work, change it to

function onTouched(hit)
    if game.Players:GetPlayerFromCharacter(hit.Parent) then
      hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health +15
end
script.Parent.Touched:connect(onTouched)

I know exactly what is causing the problem. Replace the script with the following:

function onTouched(hit)
	local health = hit.Parent:WaitForChild('Humanoid').Health.Health
	health = health+15
end
script.Parent.Touched:connect(onTouched)

I hope that helps :D