#If a mezuzah fell down and one is putting it up again one must recite a bracha before putting it up again if the doorway has a door and the room is at least 4 by 4 [[amot]] in size. <ref>Kitzur Shulchan Aruch 11:7, Beer Moshe 6:6, Chovat Hadar (11:15:footnote 29), Kuntres Hamezuzah 289:7, Avnei Yashfei 1:207:3-4, Rivevos Ephraim 2:28:5. Orchos Rabbeinu (v. 3, p. 178 #38) however, disagrees. </ref>
#If one took down one's [[Mezuzot]] in order to have them checked by the sofer and they were found to be kosher, according to Ashkenazim one should put them back up without a Bracha of Lekvoh Mezuzah.<ref>Kitzur Shulchan Aruch 11:7 writes that there's a doubt if one should make a bracha if a mezuzah was taken down to check it.</ref> According to Sephardim, one should make a bracha upon putting them back up after being checked by the sofer.<ref>Yalkut Yosef YD 285:93 writes that one should recite a bracha if they were taken down to be checked by a sofer.</ref> If one checks the mezuzah by himself, he need not say a new beracha. <ref>Ben Ish Chai Parashat Ki Tavo Year 2 Halacha 8, Pitchei Teshuva 289:1, Aruch Hashulchan 289:4, Chovat Hadar 11:14 </ref> If a mezuzah was found to be not kosher, then a beracha is recited when it is replaced with a kosher one. <ref>Kitzur Shulchan Aruch 11:3,5, Rivevot Ephraim 1:19, Beer Moshe 2:92:13, Kuntres Hamezuzah 289:6, Chovat Hador 11:11:footnote 20, Yabia Omer YD 3:17 </ref> Please note that a bracha is only said when replacing the mezuzah if the doorway has a door and the room is at least 4 by 4 [[amot]] in size. (See above [[#The Bracha on putting up a Mezuzah]]).
#However, if one took down one's Mezuzah just to put it in a nicer case, one doesn't need to make a new Bracha when putting it up unless it was taken down for several hours so that one stopped thinking about the Mezuzah.<ref>Yalkut Yosef YD 285:94 </ref>
#When replacing the [[mezuzot]], a new beracha is recited. <ref>Maharam Shik YD 285, Rivevot Ephraim 7:239, Beer Moshe 2:92, Avnei
Yashfei 1:207:1, Doleh Umashke (p. 275, footnote 69) quoting Rav Elyashiv and Rav Nissim Karelitz. </ref>