Is the [Scan/Stop] button on the ScanSnap flashing?
Unplug the USB cable from the computer and the ScanSnap, then plug it back in.
Make sure to leave at least 5 seconds between plugging and unplugging the cable.
[Windows] Did you connect the ScanSnap to the computer before installing ScanSnap Home?
Perform the following:
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Open Device Manager.
For details about how to display Device Manager, refer to [Windows] To display the [Device Manager] window.
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Delete the device name (such as "USB device", which differs depending on the operating system) under [Other devices] in [Device Manager].
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Disconnect the USB cable from the computer.
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Restart the computer.
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Connect the ScanSnap and a computer with a USB cable, and then try scanning again.
[macOS] Do you have access permission for the [tmp] folder on your computer?
If you do not have read and write permissions for the [tmp] folder on your computer, you cannot scan documents.
Set read and write permissions for the [tmp] folder under the [private] folder on your computer.
Are you using a USB hub?
If you are using a USB hub, connect the ScanSnap directly to the computer via a USB cable.
Did you resume the computer from hibernation or sleep mode?
Scan documents after resuming the computer from sleep mode by either moving the mouse or pressing any key on the keyboard.
Is there a USB device other than the ScanSnap operating?
Perform the following:
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Disconnect other USB devices from the computer so that only the ScanSnap is connected.
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Scan a document with the ScanSnap.
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Connect the other USB devices to the computer again.
Is ScanSnap Home running?
Refer to [Windows/macOS] To display the scan window of ScanSnap Home and start ScanSnap Home.
If the problem still persists, refer to [Windows/macOS] Inquiries regarding problems with ScanSnap Home and contact the distributor/dealer where you purchased this product.