[Elecraft] K3 ERR 12 V

[Kurt Wiksten]

During the ongoing All Asia Contest, after a few hours of sleep, I started to call Cq on 20m using my Acom 1000+ K3 at 50 W.
After about 20 minutes I noticed ERR 12Volt and the power went down to 5 W so I switched off the K3 and power supply.
After some 15 minutes of thinking I restarted the power supply and the K3. I worked some stations and called CQ for abaut 15 minutes.
Then again I got the ERR 12V message and K3 switched to 5 W.
After more thinking and reading the Manuel, I decided to try again but this time monitor the supply voltage, current drain and PA temp.
I am using a regulated DC Power supply rated 13.8V and 30A.
During this 10 min I operated barefoot with K3, power at 100W.
Power supply voltage steady on 13.9V. Current drain on listning at 0.94A. Current drain on voice(SSB): 2 - 15A
PA-temp: 38-40 degreesC
As the power supply seems to do its job OK  I wonder if something is intermittently wrong with the K3 PA??
Any suggestions would be appreciated!!

73 de Kurt/SM6BGG