How do I respawn something after it's been disabled?

I have searched online but couldn't find a working answer. I want the tree to respawn after some time but for some reason the CurrentTimer does not go down after being set to 10.

This is my code: #pragma strict

 var MaxHealth = 1000;
 var CurrentHealth = 1000;
 var TreeObj : GameObject;
 var TreeTr : Transform;
 var RespawnTransform : Transform;
 var CurrentTimer : float = 0;
 var MaxTimer : float = 10;
 var TreeRespawn = false;
 
 function Update()
 {
 
     if (CurrentHealth <= 0)
     {
         Inventory();
     }
 
 //Start countdown timer from 10
     if (CurrentTimer > 0)
     {
         CurrentTimer -= Time.deltaTime * 10;
     }
 
     CurrentTimer = Mathf.Clamp(CurrentTimer, 0, MaxTimer);
 
 //Set timer
     if (TreeRespawn == true) 
     {
         CurrentTimer = MaxTimer;
         TreeRespawn = false;
     }
 
     if (CurrentTimer < 0)
     {
         RespawnTree();
     }
 }
 
 function Inventory() //Set the tree unactive and start respawn timer
 {
     TreeObj.SetActive(false);
     Debug.Log("Add wood to inventory");
     TreeRespawn = true;
 }
 
 
 function RespawnTree() //Respawn tree
 { 
     TreeObj.SetActive(true);
     TreeTr.transform.GetComponent(Rigidbody).useGravity = false;
     TreeTr.transform.GetComponent(Rigidbody).isKinematic = true;
     TreeTr.transform.position = RespawnTransform.position;
     TreeTr.transform.rotation = RespawnTransform.rotation;
     RespawnStats();
     CurrentTimer = 0;
     TreeRespawn = false;
 
     Debug.Log("A tree has respawned.");
 }
 
 function RespawnStats()
 {
     CurrentHealth = MaxHealth;
 }

I am a beginner in unity and coding so the code might be crappy and unorganized a bit.