One or both firepots?
Set it at any temp, but 225 is not high. What was your setting when you set it hot.
What I do is when I start it, I turn it on, set all the temps and hit start. Take a small handful of pellets and put some in each pot.
That gives the ignitor plenty of pellets to start.
If you don't have an ignitor problem, then it's just that the pellets were smothering it before it started OR you had a fan problem.