The Warning Indicator is always related to a frequency band.
To show a short explanation of the warning move the cursor on the line of interest and push the button.
Move the cursor by using the arrow keys or simply tap on the line of interest in the table.
Overload detected
Measurement position disabled
Adjacent band limit warning
Distance to background level warning
Background level too high
Other function than the specified primary RT function
or
Too close to noise floor
Too short values compared to filter
or
The signal-to-noise ratio is insufficient for calculating the reverberation time
Background noise level was too high