It could be a couple of things.
1) My males seem to stop eating when they're wanting to be with a female. Although this normally isn't the time of year for that, indoor climates can confuse them.
2) I assume that he normally eats rats. If so try something else, like a mouse, or other rodent, even if it's smaller than your normal feeder, it might turn the feeding switch on. I've had males stop eating for a couple months for no particular reason, but they've never refused a baby chick -- ever.
You've got plenty of time to figure this out. Try different things. leave something that's pre-killed in it's cage overnight. You also might want to try to see if its mouth has any swollen, or tender looking areas. I hope it all works out for you.

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