Was it fully charged? What is the resistance of the old coil, it should be printed in tiny letters on the coil. If the resistance has changed, it's possible that the battery which was firing the other coil (and it may have been a HIGHER resistance coil) stopped firing the lower resistance coil (although that kind of makes not so much sense to me-- it's a fixed wattage setup that should deliver the same amount of "wattage" per charge... IDK, I'd try charging the battery to full again.
I'd also say it's possible that you've got an electrical fault, so until it starts behaving normally again (if you can get it to, at all) I wouldn't try firing it or anything else. I would stay close by (but not TOO close either) so you can monitor it as it charges, if you even want to try that.
I might take the whole thing in to a vape shop (if you have a good one near you) and see if they can help and/or watch some video reviews of the device (more for how to operate it than necessarily the reviewer's "opinion") and if all else fails, consider warrantying it.
Perhaps someone will be along with the magic solution, but possibly your other coil "burned" not because you didn't prime it, but possibly because an electrical fault was starting, leading your mod to fire erratically. Etc.
Best of luck and welcome
Anna