Scanner Not Working or Not Detected? Complete Fix Guide
Your printer prints fine but the scanner won't work or isn't detected. This is almost always caused by incomplete driver installation — the scanner requires a separate driver component that is not included in the basic print driver. This guide walks you through every fix.
Does this describe your problem?
- Scanner is not detected in Windows or Mac scanning apps
- "No scanner found" or "Scanner unavailable" error message
- Scan button on the printer does nothing when pressed
- Scanner worked before but stopped after a driver update or Windows update
Try this first
Install the Full Driver & Software Package from the manufacturer's website — most scanner 'not found' errors are caused by installing only the basic print driver, which does not include the scanner component.
Step-by-Step Fix
Follow each step in order. Most issues are resolved within the first three steps.
- 1
Verify the physical connection
For USB: confirm the cable is firmly connected at both ends. Try a different USB cable and a different USB port on your computer. For wireless: ensure the printer is connected to Wi-Fi and that your computer is on the same network. The printer and computer must be on the same subnet for wireless scanning to work.
- 2
Install the Full Driver & Software Package
Visit your manufacturer's support site and download the Full Feature Software or Full Driver & Software Package — not the basic driver. This includes the TWAIN/WIA scanner driver, manufacturer scanning app (HP Scan, Canon IJ Scan Utility, Epson Scan 2), and all supporting components required for scanning.
- 3
Check Windows Image Acquisition (WIA) service
Press Win+R, type services.msc, Enter. Find "Windows Image Acquisition (WIA)." Ensure its Startup Type is Automatic and its Status is Running. Right-click and select Start if stopped. This service is required for all scanning in Windows — if WIA is not running, no scanner will be detected.
- 4
Use the manufacturer scanning app instead of Windows Fax and Scan
Windows Fax and Scan often fails to detect network scanners. Try the manufacturer app: HP Smart (includes HP Scan), Canon IJ Scan Utility, Epson Scan 2, or Brother iPrint&Scan. These apps are specifically designed for your hardware and communicate directly with the device driver.
- 5
Check antivirus or firewall blocking
Security software can block scanner communication ports. Temporarily disable your antivirus and try scanning. If scanning works with antivirus disabled, add the manufacturer's scanning application and UDP/TCP port 9220 (or 9100) to your security software's exception list.
- 6
Reinstall scanner drivers
Uninstall the current printer software via Settings > Apps > find the manufacturer software > Uninstall. Restart the computer. Download a fresh Full Driver Package from the manufacturer website and reinstall. After installation, open Device Manager and expand Imaging Devices to confirm the scanner is listed without a warning icon.
Advanced Troubleshooting
If the steps above did not resolve the issue, try these advanced fixes.
- 7
Add scanner manually by IP address (network scanners)
If the scanner is not auto-detected over Wi-Fi: open the scanning app and look for an option to add scanner manually by IP address. Print the printer's Network Configuration Page to find its IP address. Enter this IP directly in the scanning app to establish a direct connection.
- 8
Open firewall ports for network scanning
Network scanning requires specific ports: TCP 9220 (Epson scan), TCP 9100 (HP/Brother), and UDP 5353 (mDNS/Bonjour for discovery). If Windows Defender Firewall or a third-party firewall blocks these, printing may work but scanning fails. Add an inbound rule to allow these ports in Windows Defender Firewall Advanced Settings.
Frequently Asked Questions
Common questions about scanner not working fix.
Why does my printer print fine but the scanner doesn't work?
Printing and scanning use separate driver components. Basic print drivers include only print functionality. The scanner requires a TWAIN or WIA driver that is only included in the Full Feature Software package. Download and install the full software package from the manufacturer's website to enable scanning.
How do I scan wirelessly to my computer?
For wireless scanning: ensure the full software package is installed and the printer is on the same Wi-Fi network as your computer. Open the manufacturer scanning app, select your printer from the scanner list. If it does not appear, add it manually using its IP address (found via the printer's network configuration page). Both devices must be on the same subnet.
My scanner appears in Device Manager but won't scan. Why?
If the scanner shows in Device Manager without a warning icon but won't scan, the scanning software may be the issue rather than the driver. Uninstall and reinstall the manufacturer's scanning app. Also verify the Windows Image Acquisition (WIA) service is running. Try scanning from a different app (IrfanView, GIMP) to determine if the issue is app-specific or driver-level.
Can I scan from my phone using a wireless printer?
Yes. Most modern all-in-one printers support mobile scanning. Use the manufacturer app: HP Smart, Canon PRINT, Epson Smart Panel, or Brother iPrint&Scan. On Apple devices, Continuity Camera allows scanning directly to a Mac from an iPhone. Both the phone and printer must be on the same Wi-Fi network.
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