Repeat loop not working? (working with BoolValue)

So basically, if my boolvalue is true it'll play the loop which is what I want! Now the problem is.... I have this repeat loop, and I'm trying to make it so that it will keep on Looping UNITL the boolvalue is false. And I sneaked in a boolvalue.Value = false, yet confusingly it KEEPS on looping???

Here is the script:

local boolvalue = script.Parent.Value
local light = game:GetService("Lighting")
local alarm = script.Parent.Parent.alarm
local message = script.Parent.Parent.corevent
local temp = script.Parent.SurfaceGui.Text
while true do
    wait()		

    if temp.Text == "2000°c" then
        script.Parent.Parent.Map.coremachine.coreOverheat.Fire.Enabled = true
        alarm.Looped = true
        boolvalue.Value = true
    end
	if boolvalue.Value == true then
		message:Play()
repeat
			light.Ambient = Color3.new(150/255,0/255,0/255)
            alarm:Play()
            wait(0.2)
            light.Ambient = Color3.new(0/255,0/255,0/255)
            wait(0.9)
            light.Ambient = Color3.new(150/255,0/255,0/255)
			boolvalue.Value = false
until boolvalue.Value == false
		end
		
end

Put until boolvalue.Value == false somewhere above boolvalue.Value = false see if that helps.

Try using this

local boolvalue = script.Parent.Value
boolvalue = true --an example to set it

if boolvalue == true then
	--run code
	boolvalue = false
end

if boolvalue == false then
	--run code
	boolvalue = true
end

Good Luck!