Q. (Re – question 2823 above on a mezuza that almost fell). How about if the mezuza totally fell and was not replaced for at least two months (we were away), do you make a brocho when you replace it?
A. Horav Shlomo Miller’s Shlit’a opinion is that if a mezuza completely falls off the door post, one should recite a brocho when replacing it. The Rov added, that although when one’s taalis completely falls off, some don’t make a brocho, (see question above), since they follow the opinion of the Poskim that advise not to recite, as they may already had in their minds when they recited the original brocho, that if the taalis completely falls off from one’s body, (which is not uncommon), replacing it would also be included in that original blessing. However, a mezuza falling off the door post is unusual, and therefore a new blessing should be recited, even after a short time.
The Rov also added his opinion to those Poskim who maintain that no brocho is recited when replacing a mezuza that was removed for the purpose of having it checked.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a