Give him an entire day to get situated, do not hold him, do not bother him. If you can, try to even stay out of the room he's in. Then, try again tomorrow. Repeat if he does not feed.
Balls are notorious for going off of feed randomly or from stress induced factors.
"Also, if your enclosure has a screen top, you may have difficulty holding in humidity. If that is the case, you should consider covering part of the top with plexiglass"
+1. I can't say how much I agree with this. Humidity is a nightmare to keep in glass tanks, and you're most likely going to need a piece of plexi covering the top if it's a screen. Cut a circular opening for your heat lamps and a couple 3/4" holes on the ends. You need less ventilation than you think.
Artgecko gave great advice, I would also use only the ceramic heat emitter. The red bulbs are a waste of time, additionally ball pythons spend most of their time in termite borrows so they are not a species that needs ANY additional lighting to begin with. The daylight from a small window is sufficient.
How big of a tank is he in ? 20 gallon long?