I've had males do this. Each time I have found this little trick to work to get them to take a meal.
(My boas are all fed f/t rats).

Get a live mouse, nothing bigger, so it can't hurt your snake. Have a thawed rat at your side, the size of a normal prey item. As he swallows the mouse, introduce the nose of the rat and he will keep eating.

I do this once a month until they are back on their normal schedule. Usually late January to early February.

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