why doesnt my alarm sound when phone is silenced

[AC Question]

When my galaxy s5 sound is silenced since big update my alarm sound doesnt work.

 

[SpookDroid]

Are you on Lollipop now? If so, that's (unfortunately) how it works now. If you set your notifications to NONE, that includes alarms. You'd need to set the alarms as a priority notification and then just select that (priority).