Harald;
What is the serial # of the K3?
If older, did you change the P30 and P35 front panel pins (to RF board)
to gold?.
If you have a sub receiver, make sure it is enabled and then check FW
revisions, if the AUX DSP board has mismatched FW, you can get ERR DSE.
Keith WE6R Elecraft K3/K4 Tech
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