Errors go hand in hand with software, no matter how much optimal it is. This fact goes all the same with QuickBooks. Just like in all the other software, QuickBooks too shows up multiple errors at times. But no worries, there also lies solutions to these errors. One such error is QuickBooks POS Error 1706.
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QuickBooks POS Error 1706 may occur due to damaged installation files. To fix:

Ensure a stable internet connection.
Run QuickBooks POS Repair tool.
Reinstall POS using the original installation media.
Restart your computer.
If issues persist, contact QuickBooks support for further assistance.

Regards,
Peter