You will absolutely have some esters there. I have not found fermenting warm with S04 to be tart...more super fruity. Nothing to do but wait it out.I'm an idiot and need some advice. I brewed this one on Thursday and everything went great! Except, my location for my carboy was not thought out very well. I put it in my closet because my basement has been sitting around 55F and I was concerned it would be too cool. However, I didn't realize my dryer vent runs directly under my closet, bringing my carboy to a nice warm 78F. I have read that US04 gives off a tart taste above 68F.
So, do I go to the LHBS for more grain and re-brew, or stick it out and see what happens? Total time at 78F is 36 hours. Almost all activity has subsided.
Two things:
Why did you use S04 for this...seems the wrong yeast for the job even though it is one of my favorites?
Primary fermentation is probably over so honestly leave it where it is for a week or to and see if the yeast can clean up after itself.