HP Utility and Scanning issues with Officejet Pro 6830

Question

I purchased a 6830 several weeks ago and have been using it for general wireless printing from my Mac for serveral weeks with no problems.   Today I wanted to try scanning, and for the first time brought up the "HP Utility" and noticed that it connects to the printer, but lists the supplies as "Cartidge is missing" for all the cartridges.   However, when I go to the front panel of printer and select the "ink" icon, it show that I have all cartridges installed with almost full ink.   I perform a "test print" from the printer queue and it prints it fine.   
I removed the driver and reinstalled, and got the same results (evern with multiple reboots, and printer power resets)
In addition, when I try to do a ether a scan to computer from the printer, or from the HP Scan utility I get a failure.  From the scan utility. Using scan to computer, I select my Mac and the process starts (and a little window pops up on my Mac for a few seconds), but eventually the printer gives a message that it lost contact with the computer.   
Yes the "Enable Scan to Computer" box is checked, and there is a green "Scan to Computer Enabled" indicator in the HP Utility window.
I've followed various appropriate trouble shooting guides but nothing appears to work.
Also checked if the Printer Firmware was up to date and it was.
When I connect using the Webinterface to the printer,  the productinformation->printer information page show that the cartidges are installed, and "ink guage" has appropriate levels.
Also, webscan does not appear to work, although it pops up an empty pdf page, and I can hear the printer doing something (although not feeding the pages)
HP Utility:  5.22.0
HP Inkjet 4 Driver 4.2.0
OS X : 10.10.1

Answer 1

Hi,
First of all open System Preferences and select Sharing.
Ensure the computer name doe snot include any Non-English or special characters, click on Edit and change it if necesary.
Next clcik the Apple icon and then About This Mac.
Clcik on Software Update and then clcik the top Store Menu.
Select Reload This Page and install any listed HP or Apple Updte if a such exists.
If thwe same persists a such may also happen due to network issues...
What exact error appears while launching a scan from the HP Scan application or from Image Capture?
A such may allow to better understand any possible cause.
As well try enabling wireless direct on your printer and connect the Mac to the printer:
Click the Wireless Direct icon () and turn it on, take a note of its passcode.
From your Mac click the WiFi icon and select the printer's network
Note: if a such is not listed click on Join Other Network and then Show Networks, then it should be listed.
Allow it a moment to connect and try scanning from your Mac, as well try checking the ink levels now.
If those are working as expected, the issue may rely on your home network.
Please clarify your router brand and model, I will do my best to guide you further.
Shlomi
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