Important basic info

Rollout means the fire has "rolled out" from where it
belongs and a part of the heat exchanger that is not
supposed to get hot, is getting too hot.

So obviously this could be dangerous.

If you reset the swicth, I would watch the
the burner operation carefully for a while
to make sure the fire stays here it belongs.
That can be difficult if there are lockout safteys on the
cabinet.

Mark