I have had similar problem before. Expertly helped by Elecraft support, I found 
the PIN diode on the RF board was broken.
I would suggest you to talk to Elecraft support.

73 de JH3SIF, Keith

> 2015/04/05 8:06、Mike Reublin NF4L <[email protected]> のメール:
> 
> My K3 puts out no power in any mode, either on the SteppIR or into a dummy 
> load. It's not in test or split. TX INH is off. Holding tune results in the 
> LCD displaying 0 W, and the VFO A area changes to 2 dashes on the right, no 
> digits. Tune power is set to 50W, Power to 100W.
> 
> A 50W TX Gain calibration passed, but still no joy.   
> 
> It seems to be hearing OK.
> 
> What have I fat fingered?
> 
> 73, Mike NF4L
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