Got the Regency Hi500 with fan installed in April, so I never go to use it until now. Followed direction to get my first fire, no issues. I now have it filled up and the temp is hovering at 1000 degrees for half an hour yet the fan has not kicked in yet. It is set to auto. So I turned it on manual for about 15 minutes just to make sure it is working. Is there a length of time the temp has to be at a certain temp before it kicks in? What temp is too high in my wood burning insert?