Uniden Ui15 Instruction Manual page 14

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"ISO"– Isolation Alarm Indication.
When the system does not have enough isolation between the outdoor and
indoor antennas, the "ISO" indicators will be flashing showing that the ISO
is lowering the gain in some bands to keep the system from oscillating. Press
the"SET" key and the LCD screen will display "ISO" showing the current band or
bands affected.
"ALC" Flashing.
When the amplifier is receiving too much DL power from the tower and the DL
amplifier output is close to saturating, the "ALC" indicators will flash showing that
the ALC has lowered the gain to prevent this overload condition. Press the "SET"
button and the screen will show the band or bands affected.
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