Safety and data note
If the phone was wet, gets hot, smells unusual, or has a swollen battery, stop charging it and seek qualified help. Back up data before resets or restore attempts.
Quick answer
Face ID can fail because of obstruction, screen protector interference, software settings, camera/sensor damage, prior repair, or liquid exposure. Start with cleaning and settings before assuming hardware failure.
Most common causes
- Dirty sensor area
- Screen protector covering sensors
- Face ID settings issue
- Recent screen repair
- Drop damage
- Liquid exposure
Step-by-step checks
- Clean the front sensor area.
- Remove accessories covering sensors.
- Restart the iPhone.
- Check Face ID settings and reset Face ID.
- Update software when practical.
- Get diagnosis if setup fails or the issue started after impact.
| Outcome | What it means | Next step |
|---|---|---|
| Issue resolves | The problem was likely accessory, settings, or software related. | Monitor for recurrence and back up the device. |
| Issue repeats | Hardware, battery, storage, or board-level failure may be involved. | Get a diagnosis before spending money. |
| Phone heats up or was wet | Continuing to charge can make damage worse. | Stop charging and prioritize data safety. |
Need help deciding what to do next?
If the simple checks do not solve the issue, compare repair options before spending money or erasing the phone.
Check Face ID repair optionsWhen to get repair help
Get help when the problem continues after basic checks, appears after a drop, involves liquid exposure, blocks data backup, or affects core functions like charging, display, audio, camera, or unlock.
Frequently asked questions
Why does Face ID setup fail?
Setup failure often points to obstruction, software, or hardware sensor problems.
Can Face ID fail after screen replacement?
Yes. Sensor handling or unrelated damage can be involved.
Can I use passcode only?
Yes, but Face ID failure can hurt convenience and resale value.