[Elecraft] K2/100 KPA100: Cannot Adjust tPA, Stuck at 0C

[Ian Greenshields]

After repeating the power calibration on my K2 KPA100 due to low
output power, I found the CAL tPA function had reset to 0C and can no
longer be adjusted.

Having pressed EDIT from the CAL tPA display, the display shows tPA
0C, but turning the VFO knob has no effect on the display, it remains
resolutely at 0C.

Scanning the archives dug up a couple of similar issues, but no
solution. Has anyone seen this? Is the there a fix? Is my brain
disconnected & I'm doing something stupid (most likely scenario, I'll
admit)?

I'm now concerned that having fixed the output power, the fan won't
switch on when it's needed.

Any help appreciated.

73 Ian G4FSU