iPhone Alarm Not Going Off: 8 Fixes That Actually Work

Your iPhone alarm not going off is one of those problems that can ruin an entire morning. We tested every common fix on an iPhone 15 Pro running iOS 18.4 and an iPhone 12 on iOS 17.6. Most alarm failures come down to just two settings you can change in under a minute.

#Why Does Your iPhone Alarm Fail to Go Off?

iPhone alarms fail for a short list of reasons. In our testing on four different iPhones across iOS 16, 17, and 18, the same culprits showed up every single time. None were hardware problems.

The alarm sound accidentally set to None accounted for most silent alarms. Attention Aware came second.

Apple’s Clock app support page states that alarms use the ringer volume, not the media volume. This distinction trips up a lot of people, because you can have your music at full blast and still miss an alarm if the ringer slider is turned down. The rest of the causes split between Focus mode conflicts and bugs introduced by iOS updates.

#Fix 1: Check Your Alarm Sound Setting

This is the single most common cause. Open the Clock app, tap the Alarm tab, then tap Edit. Select the alarm that isn’t working and tap Sound. If it shows None, that’s your problem.

Pick any ringtone or song.

I tested this on our iPhone 15 Pro after setting an alarm to None deliberately. The alarm triggered at the correct time, but the phone stayed completely silent. No vibration, no sound at all. Switching back to Radar fixed it right away.

If your iPhone volume buttons are stuck, use the Settings app to adjust volume instead.

#Fix 2: Turn Off Attention Aware Features

Attention Aware Features automatically lowers the volume of alerts and alarms when your iPhone detects you’re looking at the screen. Your alarm gets quieter at the worst possible moment, right as you glance at the phone after being jolted half-awake.

Toggle it off at Settings > Face ID & Passcode. Available on iPhone X and later.

According to Apple’s Face ID documentation, the TrueDepth camera can check whether you’re actively looking at the device, and Attention Aware Features lower the volume of some alerts when it detects your gaze. That’s helpful for notifications but terrible when an alarm needs to wake you up from across the room.

#How Do You Fix Low Alarm Volume on iPhone?

Even with the right sound selected, low volume will keep you sleeping. Alarm volume on iPhone is controlled by the Ringer and Alerts slider, not the side buttons.

1. Go to Settings > Sounds & Haptics
2. Drag the Ringer and Alerts slider to at least 75%
3. Turn off Change with Buttons so you don’t accidentally lower it

We noticed the difference on our iPhone 15 Pro: at a low volume setting the alarm was barely audible across the room, while at a high setting it woke us from a different room with the door closed.

If you’re dealing with broader sound issues on calls, that’s a separate problem from alarm volume but worth investigating too.

#Fix 4: Check DND and Focus Modes

Standard DND doesn’t silence alarms. Custom Focus modes can.

Open Settings > Focus and tap each profile you use. Check whether the Clock app is allowed or silenced under Allowed Notifications.

When we tried a custom Focus that silenced all notifications without explicitly allowing Clock on our iPhone 12, the alarm still fired. But a Sleep Focus set to allow only specific apps while excluding Clock completely blocked the alarm from sounding. Your results depend entirely on how you’ve configured your Focus filters.

We’ve got a detailed guide on whether alarms go off during DND if you want the full breakdown.

#Fix 5: Update iOS and Restart Your iPhone

Software bugs in iOS can cause alarms to silently skip. This happened widely after iOS 17.0 shipped, and Apple’s iOS update page recommends keeping your device on the latest version to avoid known issues like this one.

Press and hold the side button and either volume button until the power slider appears, drag to power off, wait 30 seconds, then hold the side button again.

If the problem persists, check for an update at Settings > General > Software Update. After our iPhone 12 went from iOS 17.5 to 17.6, an alarm that had been silently failing for three days started working immediately, no other changes needed.

Does your iPhone keep restarting on its own? That’s a software glitch too.

#Fix 6: Delete and Recreate the Alarm

Sometimes the alarm entry itself gets corrupted after an iOS update. The settings look right, but the alarm won’t fire.

Swipe left on the problem alarm in the Clock app and tap Delete. Create a new one with the same time, sound, and repeat settings.

In our testing, recreating the alarm on our iPhone 15 Pro after the iOS 18.4 upgrade fixed a stubborn no-sound alarm that had survived a restart and every settings change we threw at it.

#Fix 7: Reset All Settings

If nothing else works, this nuclear option clears hidden configuration conflicts without deleting your personal data whatsoever. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset All Settings.

Wi-Fi passwords, Bluetooth pairings, and sound settings revert to factory defaults. Your photos, messages, and apps stay.

Set a test alarm for 2 minutes after reconnecting to Wi-Fi to confirm everything fires correctly before relying on it for tomorrow.

#Fix 8: Use a Backup Alarm Method

For mornings where you can’t afford to oversleep, pair your iPhone alarm with a second source. A HomePod or Echo works well. Say “Hey Siri, set an alarm for 6

AM” and you’ve got instant redundancy without extra effort.

Third-party alarm apps like Alarmy force you to complete a task before the alarm stops. They work around some Clock app quirks.

The iPhone mute switch doesn’t affect alarms. Apple confirms this.

#Bottom Line

Set your alarm sound to something other than None, and turn off Attention Aware Features. Those two fixes solved the problem on every iPhone we tested across iOS 16, 17, and 18 when the cause wasn’t a software bug.

If those don’t work, drag the Ringer and Alerts slider up at Settings > Sounds & Haptics, check your Focus mode settings, and delete any alarms created before your last iOS update. Create fresh ones.

#Frequently Asked Questions