[Elecraft] K3 Error Message "ERR AT3"

[David Y.]

Hi All,

Early on my K3 (#96) had an issue where it would not turn off without 
removing all power connections.  This ultimately required a trip back to 
Elecraft to resolve the problem.  That problem was fixed, but ever since 
I've continued to have periodic error message problems--specifically, I will 
sometimes turn on my K3 and get the error message "ERR AT3".  When this 
happens, my ATU is not recognized.  Usually I can "resolve" this by 
disconnecting the K3 from all power, waiting a while, then re-connect. 
Sometimes though, it takes several such maneuvers, and can take as much as 
an hour or two before it works.  It just happened again, but only took a 
minute or two to resolve.

Has anyone else had a problem like this?  Any ideas on how to fix it?

Dave W7AQK