How to Fix Face ID When It Stops Working

Published 2026-10-14 · Marion Phone Repair

Face ID failing to recognize you, asking for your passcode repeatedly, or showing the message Face ID is not available is a common iPhone complaint. The cause is usually something blocking the TrueDepth camera, a settings issue, or in some cases a hardware problem with the sensor array. Here is how to work through it.

Clean the TrueDepth camera area

The Face ID system uses the small cluster of sensors at the top of the iPhone screen (the notch on older models, the Dynamic Island on newer ones). If any of these sensors are blocked or dirty, Face ID will not work.

• Wipe the top of the screen and the sensor area with a clean, soft cloth. Look for smudges, dust, or fingerprints specifically over the sensors
• If you use a screen protector, check that it is not covering or partially obstructing the TrueDepth camera area. Some screen protectors, especially full-coverage tempered glass, can sit too close to the sensors and interfere. Try removing the screen protector and testing Face ID
• Check for any debris in the earpiece speaker grille, which is adjacent to the Face ID sensors. Built-up lint or dirt can physically block the infrared projector

Check your face position and conditions

Face ID has specific requirements for recognition:

• Distance: Hold the phone 10 to 20 inches from your face (about arm's length). Too close or too far and Face ID cannot map your face properly
• Orientation: On iPhones with Face ID, the phone must be in portrait orientation by default. Landscape Face ID is available on iPhone 13 and later models running iOS 16 or later. If you are trying to unlock in landscape on an older model, it will not work
• Direct sunlight: Very bright direct sunlight can interfere with the infrared dot projector that maps your face. If you are outdoors in bright sun, shade the phone or angle it away from the sun
• Sunglasses: Some sunglasses, particularly polarized lenses, block the infrared light that Face ID uses to detect your eyes. If Face ID fails consistently when you wear certain sunglasses, go to Settings, Face ID and Passcode, and toggle on Require Attention for Face ID. Alternatively, turn off Require Attention for Face ID so the phone does not need to see your eyes. The downside is reduced security since the phone can be unlocked without you actively looking at it
• Face coverings: A mask, scarf, or face covering blocks Face ID unless you have set up Face ID with a Mask (available on iPhone 12 and later with iOS 15.4+). Go to Settings, Face ID and Passcode, and set up Face ID with a Mask if available on your model

Reset Face ID and set it up again

If Face ID has become less reliable over time, resetting and re-enrolling your face can fix it:

1. Go to Settings, Face ID and Passcode
2. Enter your passcode
3. Tap Reset Face ID
4. Tap Set Up Face ID
5. Follow the prompts to scan your face. Move your head slowly in a circle so the sensor captures your face from multiple angles
6. Complete both scans (the setup requires two passes)

Tips for a good enrollment: remove glasses, hats, and scarves for the initial scan. Make sure the room has adequate lighting but not harsh direct light. Hold the phone at a natural distance.

Set up an Alternate Appearance

If Face ID works sometimes but not consistently, you may look significantly different at different times (with and without glasses, different hairstyles, facial hair changes). Face ID learns over time, but you can speed this up:

1. Go to Settings, Face ID and Passcode
2. Tap Set Up an Alternate Appearance
3. Scan your face in the condition where Face ID usually fails (wearing glasses, for example)

You get one alternate appearance slot. Use it for whatever look Face ID struggles with most.

Restart the iPhone

A restart clears the Face ID sensor cache and reloads the TrueDepth camera drivers. If Face ID suddenly stopped working (it was fine yesterday, not today), a restart is the most likely fix:

1. Press and hold the side button and either volume button until the power off slider appears
2. Slide to power off
3. Wait 30 seconds
4. Press and hold the side button until the Apple logo appears

After the restart, test Face ID. If it works, the issue was a temporary software glitch.

Update iOS

Apple regularly fixes Face ID bugs in iOS updates. Go to Settings, General, Software Update and install any available update. Several past iOS versions had known Face ID issues that were fixed in subsequent releases.

Check Face ID settings for specific features

Face ID can be enabled or disabled independently for different functions. If Face ID works for unlocking but not for App Store purchases, or vice versa, check the individual toggles:

1. Go to Settings, Face ID and Passcode
2. Enter your passcode
3. Review the toggles under Use Face ID For: iPhone Unlock, iTunes and App Store, Wallet and Apple Pay, Password AutoFill
4. Make sure the functions you want are toggled on

Check for physical damage

The TrueDepth camera system is one of the most fragile components in the iPhone. It consists of an infrared camera, flood illuminator, dot projector, and proximity sensor all packed into a small area at the top of the phone. Damage to any of these components causes Face ID failure.

Drop damage

A drop can damage the TrueDepth camera even if the screen looks fine. The dot projector and infrared camera use precise alignment. If the phone was dropped and Face ID stopped working immediately after, the internal alignment or a component itself is likely damaged. You may see the error Face ID is not available. Try to set up Face ID in Settings. This error after a drop almost always indicates hardware damage.

Water damage

Water can corrode the TrueDepth camera components or leave mineral deposits on the sensor lenses. If Face ID stopped working after the phone got wet, let the phone dry completely (24-48 hours in a dry environment) and test again. If it still does not work, internal corrosion may be affecting the sensors.

Screen replacement

Face ID is tied to the original screen assembly and its TrueDepth camera system. If the phone had a screen replacement and the original TrueDepth camera module was not transferred to the new screen (or was damaged during the repair), Face ID will not work. This is one of the most common causes of permanent Face ID failure: a screen repair where the Face ID components were not properly migrated. On iPhone models before iPhone 16, the TrueDepth camera is a separate module that must be carefully transferred from the old screen to the new one. Damage to the thin flex cables during transfer is a frequent repair-shop mistake.

Microcrack in the dot projector window

The small window for the dot projector can develop a hairline crack that is nearly invisible but blocks enough infrared light to prevent Face ID from working. Look at the sensor area under bright light at different angles to check for any fine cracks.

When Face ID cannot be fixed with software

If you see the error Face ID is not available. Try to set up Face ID after a restart and iOS update, and you have cleaned the sensor area and checked for obstructions, the TrueDepth camera hardware is likely damaged or failed. This is not a setting you can change. The sensor array needs diagnosis and possibly replacement.

Face ID repair in Marion

If Face ID stopped working after a drop, water exposure, or screen repair, Marion Phone Repair diagnoses TrueDepth camera issues and handles the component-level repair needed to restore Face ID on iPhones.