Why Does My Scanner Not Work but Printer Does?

When the printer works but the scanner does not on an all-in-one, it is almost always a software issue, not hardware, because scanning uses a separate driver and service from printing. A missing scan driver, a stopped scan service, a firewall blocking scan traffic, or a print-only driver install are the usual causes. Installing the full feature driver and enabling the scan service normally fixes it.

Why this happens

• You installed a basic, print-only driver that leaves out the scanner component such as TWAIN or WIA.
• The scan-to-computer service or the Windows Image Acquisition service is stopped.
• A firewall or antivirus is blocking network scan traffic when you scan over Wi-Fi.
• The printer's IP changed, so printing may still work while scan discovery fails.
• On a Mac, the scanner needs the driver's scanner extension or a supported AirScan profile.

Is this normal?

It is common on all-in-ones because printing and scanning are independent functions, so one can work while the other does not.

Does it cause any problems?

You lose scanning only. There is no damage, and printing continues to work.

How to fix or check it

1. Reinstall the full feature software, not the basic print driver, from the manufacturer for your exact model.
2. On Windows, open services.msc and make sure Windows Image Acquisition is running and set to Automatic.
3. Enable "Scan to computer" in the manufacturer's printer app if you scan over the network.
4. Temporarily disable the firewall or antivirus to test. If scanning then works, add an exception for the printer software instead of leaving protection off.
5. Confirm the printer's current IP address, then re-add the scanner in the software.
6. On Mac, open System Settings, Printers and Scanners, select the device, and open the Scan tab. If it is missing, reinstall the driver or add the device by IP with AirScan.
7. Try the manufacturer's own scan utility rather than a third party app to rule out a TWAIN or WIA problem.

Frequently asked questions

Why does my all-in-one print but not scan?

Scanning uses a separate driver and service. A print-only install or a blocked scan service is the usual reason.

Do I need special software to scan?

You need the scanner driver, WIA or TWAIN on Windows and the scanner extension or AirScan on Mac. The built-in Windows Scan or Image Capture app can then handle scanning.

Can a firewall block scanning but not printing?

Yes. Network scan-to-PC uses different ports than printing, and security software may block those while leaving print traffic alone.