iPhone Alarm Not Going Off? 10 Fixes

Settings → Sounds & Haptics → Ringer and Alerts. The slider controls alarm volume directly. Make sure "Change with Buttons" is OFF for alarms — if it's ON, you may have accidentally lowered it while adjusting media volume. Set the slider to at least 75% and test with a preview tone. This setting is completely separate from media volume.

Clock app → Alarms → tap the alarm → Sound. If it shows "None," your alarm fires silently — the screen lights up but no audio plays. Tap Sound and select any ringtone. This happens when alarms are created or edited in certain third-party apps that set the sound to None, or when synced from old iTunes backups.

Clock app → Alarms tab. Each alarm has a green/grey toggle on the right. If it's grey, the alarm is disabled — it won't fire regardless of the time setting. Also verify the correct days are selected: tap the alarm → Repeat. An alarm set for "Monday" won't fire on a Tuesday. A one-time alarm with no repeat only fires once and then auto-disables.

Do Not Disturb and Focus modes DO silence alarms in iOS 15 and later — this is a significant change from older iOS. Go to Settings → Focus → Do Not Disturb → scroll to "Alarms & Timers." Make sure alarms are not suppressed. Alternatively, when setting a Focus schedule, enable "Allow Alarms" in the options. If you use Sleep Focus overnight, check Settings → Focus → Sleep → during Sleep → Allow Alarms should be ON.

If you use Apple Health's Sleep Schedule: Health app → Browse → Sleep → Your Schedule → check "Wake Up Alarm." This is a separate alarm system from the Clock app. If the Health sleep alarm is set correctly but still silent, check its volume in the Health app settings and ensure it uses a tone (not None). Note: Sleep Focus activates automatically around your bedtime and can suppress other alarms.

If your iPhone is connected to Bluetooth headphones, a car stereo, or a speaker, the alarm audio routes there — not to your phone's speaker. If those devices are across the room or in another car, you won't hear it. Check Control Center → long-press the audio card → look at the playback destination. If it shows AirPods or a car name, the alarm will play there. Turn off Bluetooth before sleeping or choose a louder alarm sound that will carry.

Clock app → Alarms → create a test alarm for 1 minute from now → Sound → tap any tone to preview. If you can't hear the preview, your speaker may be blocked by a case covering the bottom speaker grille, or the speaker is damaged. Clean the speaker grille with a soft dry brush. Test with a known-working audio file through Apple Music — if music plays fine but alarms are silent, it's a software routing issue, not hardware.

A full restart clears the Clock daemon state and audio routing cache. Hold Side + Volume Down → slide to power off → wait 30 seconds → restart. After restarting, immediately verify the alarm is still enabled (restarts don't delete alarms, but worth confirming) and check the sound setting again.

Clock app → Alarms → swipe left on the problematic alarm → Delete. Create a new alarm from scratch: tap the + button, set the time, select a loud ringtone (Alarm is the default and loudest), set Repeat if needed, and save. Corrupted alarm entries from iOS updates or app-created alarms occasionally fail to fire correctly — recreating fixes it reliably.

Settings → General → Software Update. Apple ships alarm-related bug fixes periodically. iOS 17.4 fixed a silent alarm regression affecting certain Focus configurations. If no update helps: Settings → General → Transfer or Reset iPhone → Reset → Reset All Settings. This resets audio routing and Focus configurations without deleting your data or apps. Recreate your alarms afterward.