When I give an appropriate command to my HP Fax Machine, it shows HP Fax test failure error message. When I send fax through my machine, my test is failed. I think that there can be some problems with your Fax machine. I am applying my right techniques to fix HP Fax test failure error, but I am not able to rectify this technical problem. Really, it is a big technical glitch for me, so I look for online technical help to sort out this issue. So anyone can share the solid tips to solve this technical issue.