QuickBooks POS error 1706 is basically a point of sale error. This error usually occurs when the user tries an installation from a removable media, like the CD or DVD. When there is any issue with the installation of QB point of sale, the user might get QuickBooks error code 1706. This error is usually seen when the user tries to start the point of sale installer. This error message appears on the screen stating that a valid source was not found while trying to open POS. In case you are also facing the error code 1706, then make sure that you read this post carefully till the end.