Elecraft KPA100 Manual - Manual (Page 58)

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Other Important Operating Information
Transmit Warning Messages
If SWR is too high, you'll see HI REFL on the LCD. If current is too
high, you'll see HI CUR. In both cases, power will be reduced as
needed. PA HOT indicates an unsafe heat sink temperature; tap any
switch to clear the message. After correcting the problem, you'll need to
reset output to the desired level using the POWER control.
Excluded Frequency Range
Transmit is disabled from 25.000 to 27.999 MHz in QRO mode.
CW Operation
In CW mode the power output may rise to a few watts beyond the
intended level, then drop back slightly below it. This is normal ALC
behavior, compensating for gain change as amplifier bias stabilizes.
8r Hold Required
8r hold function must be enabled when transmitting with the KPA100.
See 8R Menu Setting on page 48 for instruction on how to ensure 8r hold
is enabled.
Data Mode Operation
The maximum recommended power for PSK31 mode is 40 W, and
for higher duty cycle modes such as MFSK, 25 W.