[Elecraft] NO ATU message on K3

[Dennis Haarsager]

I bought a new K3 with internal ATU a few months ago, though have been
spending my little free time learning it and haven't yet put it on the air.
When I first tried it, the ATU seemed to work fine, but recently I've been
getting a NO ATU message when I tap ATU TUNE or hold ATU.  The menu option
seems to be set right.

I don't see anything in the manual that covers this.  Can anyone suggest how
to troubleshoot this?

Many thanks.

Dennis
N7DH/4