[Elecraft] K2+KPA100 hi current and hi output

[atfu]

Dear All,

I gave a new home to a  K2 + (KPA100+KAT100 in EC 2), ser#>5000. The K2
on its own is runnung fine.

When I connect to the KPA+KAT I get HiCur warning (on initiating TX) on
all bands with POW>10W. This also happens when I transmit into a dummy
load. I measured the output from the dummyload with a DMM. There are
only two values (depending on the dialled in watts):

Below 10W = 38 VDC (= 14W)
Above (I checked 20, 50, 80, 100W) = 129 VDC (= 160W!!)

In other words, as soon as the KPA is activated, the output is 160W
(according to my formula for converting VDC in W). The meter on the
power supply (good for 25A) confirms that I draw about 20A above 10W in,
apparently only limited by the slow 20A fuse in the line.

Any ideas as to what may be wrong and where I should start?

Many thanks in advance for your help!

73 de andre dm1aa