How to Fix iPhone Alarm Not Going Off

Fix iPhone alarm issues with these proven troubleshooting steps. Check volume settings, Do Not Disturb, and alarm configuration to restore reliability.

1. Check the ringer and alerts volume. Open Settings > Sounds & Haptics. Drag the Ringer and Alerts slider to at least 50%. Test by pressing the volume up button while on the home screen. The volume indicator should show Ringer, not just headphone or speaker volume.
2. Verify Do Not Disturb settings. Open Settings > Focus > Do Not Disturb. Turn off Do Not Disturb if enabled. Check that Scheduled is disabled, or verify the schedule doesn't overlap with your alarm times. Alarms should work during Do Not Disturb, but some configurations can interfere.
3. Confirm alarm configuration in Clock app. Open Clock app > Alarm tab. Verify your alarm shows a toggle switch in the ON position (green). Tap Edit, then tap your alarm to check the sound selection isn't set to None. Ensure the alarm time matches your intended wake time and AM/PM is correct.
4. Reset all settings. If alarms still fail, open Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings. Enter your passcode when prompted. This preserves your data but resets all system preferences to defaults, clearing any conflicting configurations.
5. Update iOS software. Open Settings > General > Software Update. Install any available updates. Restart your iPhone after the update completes by holding the side button and volume down button until the slider appears, then slide to power off.
6. Test with a backup alarm method. Set multiple alarms 5 minutes apart as a temporary solution. Create alarms in both the Clock app and a third-party alarm app like Sleep Cycle. This provides redundancy while you verify the primary alarm reliability.