Fix QuickBooks Error code 176109 Invalid Product Code or Invalid Product Number Featuring Image

QuickBooks application is one of the largest used worldwide because of its accuracy and features. One such feature is the easy integration of any third-party software with it. While working with such powerful features, it is bound to happen that the users may encounter some errors now and then, due to which the users are left helpless in resolving the issue without proper guidance. Amongst those errors, we will be discussing today is Error 176109. This error pops on the screen with the error code and the message “Invalid Product Code or Invalid Product Number“.


This QuickBooks POS Error 176109 is triggered when the user tries to open or register the Point-of-Sale application. It essentially means that the authentication files have been damaged or corrupted. At the same time, this issue can emerge from the lack of reading and writing permission. Though there might be some more issues besides this, let us understand this error in more detail so that you can act quickly on it.

Various Causes of QuickBooks Error 176109

Here are the several other issues that cause to trigger the Error 176109.

  • Invalid or wrong product code used during the installation of Point of Sale.
  • Lack of administrative power while working with the files.
  • Files getting corrupt or missing in the Point-of-Sale folder.

Methods to fix the QuickBooks POS Error 176109

We have seen how this error is triggered. Now we will look at all the solutions at our disposal. Follow them one by one until the issue gets eliminated.

Method 1: Deleting the content of the Entitlement Client Folder

  • Open your system file explorer by pressing the Windows key + E
  • Go to C:\Program Data\Intuit\Entitlement Client\v8


  • Select all the files present in the folder by pressing Ctrl + a keys on your keyboard
  • Press the Del key on your keyboard and click Yes for confirmation.
  • This will delete all of the files
  • Reopen the POS application and try to complete the registration process again

M 2: Change the name of the WS Activity File

  • Open your system file explorer by pressing the Windows key + E keys.
  • Open the location C:\Program Data\Intuit\QuickBooks Point of Sale XX\Ini in the explorer.
  • Locate WSActivity in it and then rename it by Right-clicking on it.
  • Once you have changed the name, hit enter or click anywhere on the screen.
  • After completion, close the windows. Now you have to delete all the content of the Entitlement Client Folder.
  • For that process, follow method -1 for it.
  • Launch the Point-of-sale application again.

Method 3: Reinstalling the QuickBooks Desktop Point of Sale

We will first uninstall the program. You can do that by:

  • Press the Windows key + R on your keyboard to open the Run program.
  • Enter Control Panel in the dialogue box and hit enter key.
  • Click on the program and feature options in the control panel.
  • Locate and select QuickBooks Desktop Point of Sale 18.0 among the lists. Then click on the Uninstall/Change button.


  • Follow the steps that appear on the screen and uninstall the program.

Once the uninstallation is over, head to the Point of the Sales data folder, copy it and then paste it onto your desktop to ensure that you have a backup in case of any failure. Rename the folder so that during the fresh installation, the POS application won’t install on this same folder and create will create a new one. Now all that’s left is to delete the QBPOSDBSrvUSER user. For that, follow the below steps:

  • Press the Windows key + R on your keyboard to open the Run program, type the control panel, and hit enter.
  • Go to User Accounts and in that click on Manage another account.
  • Click the continue option when prompted
  • Select the QBPOSDBSrvUser and click on the Delete account option
  • Once over, reboot the system

After that reinstall the QuickBooks Point of Sale should fix the error.


We hope that we were able to assist you with QuickBooks Point of Sale Invalid Product Number Error and you were able to resume your work also. We always aim to resolve accounting errors as quickly as possible and hassle-free.

If you require any additional assistance from us regarding any error or the QuickBooks application, dial 1-800-615-2347 or drop us a mail at [email protected] and our QuickBooks technical support team will get in touch with you soon.

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