My Verifone VX 520 is stuck on the CommServer screen. How do I fix it? Rene Leveque March 27, 2018 15:57 Updated Follow Simply press F3 to get to the main sale screen you are used to seeing. If you need help, call us at 408-295-8360. Related articles When I try to run a transaction on my Verifone VX 520, I get an error that says "No Line/No Host Response/ No Dial Tone." How do I fix this? My Verifone VX 520 won't process cards. What's going on? My settlement failed on my Verifone VX 520. What happened? My Verifone VX 520 won't power on! What's going on? How do I set a custom password on my Verifone VX 520? Comments 0 comments Please sign in to leave a comment.