Steve, Check switch S1 on the control board and see if you've inadvertently bumped it off the 12v position. I just had the same symptoms a few days ago and that was the "problem" Rich KB2CPE >Subject: [Elecraft] K2: False "Lo Batt" Indication >I then noticed a "Low Batt" warning on the display. Changing the display to > the V/A reading, in receive on 40M I was presented with "E00.0 i0.28".